Pub Date : 2020-07-15DOI: 10.32743/2658-4077.2020.7.16.338
A. Dimitrieva
This article examines the main prerequisites for creating a system of camp courts and the reasons for their appearance. The article analyzes the judicial system in the camps before the creation of the official Department of camp courts in the context of the political struggle in the people's Commissariat of justice of the USSR in 1944. Ключевые слова: лагерная юстиция, судебная система, сталинизм, лагеря, лагерные суды.
{"title":"THE MAIN REASONS FOR THE FORMATION AND INITIAL ATTEMPTS TO DEPLOY THE CAMP COURT SYSTEM IN 1944","authors":"A. Dimitrieva","doi":"10.32743/2658-4077.2020.7.16.338","DOIUrl":"https://doi.org/10.32743/2658-4077.2020.7.16.338","url":null,"abstract":"This article examines the main prerequisites for creating a system of camp courts and the reasons for their appearance. The article analyzes the judicial system in the camps before the creation of the official Department of camp courts in the context of the political struggle in the people's Commissariat of justice of the USSR in 1944. Ключевые слова: лагерная юстиция, судебная система, сталинизм, лагеря, лагерные суды.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2020-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77799505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yao Yang, Gaofeng Wang, Yuanqi Fang, Yifan Xia, Liang Zhong
An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions. The dynamical characteristics of swirling flames were analysed by Dynamic Mode Decomposition (DMD) method. Three types of unstable modes in the combustor system were observed, which correspond to typical acoustic resonant modes (LF mode, C1/4 mode and P1/2 mode) of the combustor system. The combustion instability is in the longitudinal mode. Furthermore, the structure of downstream hot burnt gas under stable combustion and unstable combustion is studied by imaging of visible light and near-infrared light. Results show that there is a significant difference in the downstream flow under stable combustion and unstable combustion. The DMD spectrum of the flame and the downstream hot burnt gas obtained is the same, which is close to the characteristic frequency of acoustic pressure captured by the microphone signal. The visible light and near-infrared light imaging observation method adopted in this paper provides a new imaging method for the investigation of thermo-acoustic instability.
{"title":"IMAGING DIAGNOSTICS OF COMBUSTION INSTABILITY IN PREMIXED SWIRLING COMBUSTION","authors":"Yao Yang, Gaofeng Wang, Yuanqi Fang, Yifan Xia, Liang Zhong","doi":"10.33737/jgpps/120536","DOIUrl":"https://doi.org/10.33737/jgpps/120536","url":null,"abstract":"An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions. The dynamical characteristics of swirling flames were analysed by Dynamic Mode Decomposition (DMD) method. Three types of unstable modes in the combustor system were observed, which correspond to typical acoustic resonant modes (LF mode, C1/4 mode and P1/2 mode) of the combustor system. The combustion instability is in the longitudinal mode. Furthermore, the structure of downstream hot burnt gas under stable combustion and unstable combustion is studied by imaging of visible light and near-infrared light. Results show that there is a significant difference in the downstream flow under stable combustion and unstable combustion. The DMD spectrum of the flame and the downstream hot burnt gas obtained is the same, which is close to the characteristic frequency of acoustic pressure captured by the microphone signal. The visible light and near-infrared light imaging observation method adopted in this paper provides a new imaging method for the investigation of thermo-acoustic instability.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45000217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The electric hybridization of heavy-duty road vehicles is a promising alternative to reduce the environmental impact of freight and passengers transportation. Employing a micro gas turbine as a prime mover offers several advantages: high power density, fuel flexibility, ultra-low emissions, low vibrations and noise, simplicity and lower maintenance cost. State-of-the-art micro gas turbines feature an efficiency of 30%, which can be increased to 40% by employing a mini organic Rankine cycle system as a bottoming power plant. Such a powertrain could achieve higher efficiency with next-gen micro gas turbines and mini ORC systems, especially with an R&D push of the automotive sector. This paper presents the analysis of a hybrid electric heavy-duty vehicle with a prime mover based on this concept. The best combined cycle system stemming from the design exercise features an estimated peak efficiency of 44%, and a nominal power output of about 150kW. This corresponds to the power demand at cruise condition of a long-haul truck. A series configuration with Lithium-Ion batteries was selected for the hybrid powertrain, for it decouples the prime mover dynamics from the power demand. The benchmark is a vehicle featuring a next generation diesel engine, with a peak efficiency equal to 50%. The results show that the fuel economy can be largely improved by increasing the size of the battery in the hybrid powertrain. Furthermore, employing natural gas in the prime mover of the hybrid vehicle leads to ultra low emissions that are well below the limits set by European and north American regulations. Additionally, the CO2 emissions of the hybrid powertrain are considerably lower than that of the benchmark. The work documented here thus demonstrates the potential of this hybrid powertrain concept, especially in terms of exhaust emissions, as a promising transition technology towards the full electrification of the powertrain.
{"title":"HYBRID ELECTRIC POWERTRAIN FOR LONG-HAUL TRUCKS AND BUSES: PRELIMINARY ANALYSIS OF A NEW CONCEPT BASED ON A COMBINED CYCLE POWER PLANT","authors":"Sebastian Bahamonde Noriega, C. Servi, P. Colonna","doi":"10.33737/jgpps/118979","DOIUrl":"https://doi.org/10.33737/jgpps/118979","url":null,"abstract":"The electric hybridization of heavy-duty road vehicles is\u0000a promising alternative to reduce the environmental impact\u0000of freight and passengers transportation. Employing a micro\u0000gas turbine as a prime mover offers several advantages: high\u0000power density, fuel flexibility, ultra-low emissions, low vibrations and noise, simplicity and lower maintenance cost. State-of-the-art micro gas turbines feature an efficiency of 30%, which can be increased to 40% by employing a mini organic Rankine cycle system as a bottoming power plant. Such a powertrain could achieve higher efficiency\u0000with next-gen micro gas turbines and mini ORC systems, especially with an R&D push of the automotive sector. \u0000This paper presents the analysis of a hybrid electric heavy-duty vehicle with a prime mover based on this concept.\u0000The best combined cycle system stemming from the design exercise features an estimated peak efficiency of 44%, and a nominal power output of about 150kW. This corresponds to the power demand at cruise condition of a long-haul truck. A series configuration with Lithium-Ion batteries was selected for the hybrid powertrain, for it decouples the prime mover dynamics from the power demand. The benchmark is a vehicle featuring a next generation diesel engine, with a peak efficiency equal to 50%.\u0000The results show that the fuel economy can be largely\u0000improved by increasing the size of the battery in the hybrid\u0000powertrain. Furthermore, employing natural gas in the prime\u0000mover of the hybrid vehicle leads to ultra low emissions that\u0000are well below the limits set by European and north American\u0000regulations.\u0000Additionally, the CO2 emissions of the hybrid powertrain are\u0000considerably lower than that of the benchmark. The work documented here thus demonstrates the potential of this hybrid powertrain concept, especially in terms of exhaust emissions,\u0000as a promising transition technology towards the full electrification of the powertrain.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2020-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44642732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-15DOI: 10.32743/2658-4077.2020.3.12.255
S. Loza
The aim of the article is to establish reasons and circumstances of the occurrence of Byzantine eclogue. Such ques-tions like background research and formation features of the Byzantine legislative code (eclogue of laws) are raised for goal achievement. The historical situation of the origin of the new Byzantine code and the place which was allocated to the legislation of the iconoclasts are presented. Ключевые иконоборцы, эклога законов, Византия,
{"title":"HISTORICAL AND LEGAL SITUATION OF THE CREATION OF THE LEGISLATIVE CODE OF THE VIII CENTURY. ECLOGUE OF LAWS","authors":"S. Loza","doi":"10.32743/2658-4077.2020.3.12.255","DOIUrl":"https://doi.org/10.32743/2658-4077.2020.3.12.255","url":null,"abstract":"The aim of the article is to establish reasons and circumstances of the occurrence of Byzantine eclogue. Such ques-tions like background research and formation features of the Byzantine legislative code (eclogue of laws) are raised for goal achievement. The historical situation of the origin of the new Byzantine code and the place which was allocated to the legislation of the iconoclasts are presented. Ключевые иконоборцы, эклога законов, Византия,","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2020-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73471201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-08DOI: 10.32743/2658-4077.2019.9.9.191
M. Baldano, P. Varnavsky, S. Kirichenko
The article investigates the role of the Buryat Bolsheviks in the process of creating the Buryat-Mongolian autonomy of the RSFSR. The emphasis is made on the fact that they considered the national autonomy not so much as an institution contributing to the development and preservation of the ethnic specificity of the Buryats, but rather as a tool that No 9 (9), декабрь, 2019 г. could be used to involve the Buryat people (and even more broadly the Mongolian-speaking peoples of the foreign East) in the planned world revolution. The article concludes that the Communists have taken a special place in the Buryat ethno-national movement – by participating in the nationalist discourse, they actually sought to subordinate it to the idea of a world socialist revolution. Ключевые слова: буряты, этничность, нациестроительство, национальное движение, бурятские коммунисты, автономия.
{"title":"SOCIALIST NATION-BUILDING: EXPORT OF THE WORLD REVOLUTION TO THE EAST","authors":"M. Baldano, P. Varnavsky, S. Kirichenko","doi":"10.32743/2658-4077.2019.9.9.191","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.9.9.191","url":null,"abstract":"The article investigates the role of the Buryat Bolsheviks in the process of creating the Buryat-Mongolian autonomy of the RSFSR. The emphasis is made on the fact that they considered the national autonomy not so much as an institution contributing to the development and preservation of the ethnic specificity of the Buryats, but rather as a tool that No 9 (9), декабрь, 2019 г. could be used to involve the Buryat people (and even more broadly the Mongolian-speaking peoples of the foreign East) in the planned world revolution. The article concludes that the Communists have taken a special place in the Buryat ethno-national movement – by participating in the nationalist discourse, they actually sought to subordinate it to the idea of a world socialist revolution. Ключевые слова: буряты, этничность, нациестроительство, национальное движение, бурятские коммунисты, автономия.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86968817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-08DOI: 10.32743/2658-4077.2019.8.8.174
Pavel Piskareov
The authors of the article believe that postmodernism has come and gone, giving way to metamodern, a new “era of the future”. Metamodern is the era of the “happy man”, homo beatus. This is a period of self-actualization of a person, life in a self-constructed world. А metamodern person creates her own poles of social attraction. The task of the new person is to build a personal “value-semantic universe” and the development of their own social norms. The man of metamodern receives a new level of freedom, this is the so-called “positive freedom”. Homo beatus independently builds its identities, draws a kind of “identity map”, cultural, national, as well as a map of its movements. Homo beatus does not depend on external circumstances, historical, social, cultural conditions, it is a product of its own creation, choices, attitudes to life. Ключевые слова: постмодерн, метамодерн, постмодернизм, метамодернизм, самоактуализация, позитивная свобода, homo beatus.
{"title":"HOMO BEATUS AS A METAMODERN PERSON","authors":"Pavel Piskareov","doi":"10.32743/2658-4077.2019.8.8.174","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.8.8.174","url":null,"abstract":"The authors of the article believe that postmodernism has come and gone, giving way to metamodern, a new “era of the future”. Metamodern is the era of the “happy man”, homo beatus. This is a period of self-actualization of a person, life in a self-constructed world. А metamodern person creates her own poles of social attraction. The task of the new person is to build a personal “value-semantic universe” and the development of their own social norms. The man of metamodern receives a new level of freedom, this is the so-called “positive freedom”. Homo beatus independently builds its identities, draws a kind of “identity map”, cultural, national, as well as a map of its movements. Homo beatus does not depend on external circumstances, historical, social, cultural conditions, it is a product of its own creation, choices, attitudes to life. Ключевые слова: постмодерн, метамодерн, постмодернизм, метамодернизм, самоактуализация, позитивная свобода, homo beatus.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84594821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-11-08DOI: 10.32743/2658-4077.2019.8.8.175
Gleb Sincov, Grigoriy Jarkov
This article is devoted to the analysis of the goals and principles of the formation of a parliamentary control system in the Russian Federation. The main problems related to achieving the goals of the control activities of the federal legislative bodies in modern Russia are also covered in this article. The major solution of exciting problems on social representation development seems to be rooted in an approach to eliminate formalism in implementing the concept of separation of powers in Russia. Ключевые слова: парламент, парламентский контроль, разделение властей, законность, права человека, народовластие, демократия, правовой мониторинг.
{"title":"LEGAL NATURE OF PARLIAMENTARY CONTROL IN THE RUSSIAN FEDERATION","authors":"Gleb Sincov, Grigoriy Jarkov","doi":"10.32743/2658-4077.2019.8.8.175","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.8.8.175","url":null,"abstract":"This article is devoted to the analysis of the goals and principles of the formation of a parliamentary control system in the Russian Federation. The main problems related to achieving the goals of the control activities of the federal legislative bodies in modern Russia are also covered in this article. The major solution of exciting problems on social representation development seems to be rooted in an approach to eliminate formalism in implementing the concept of separation of powers in Russia. Ключевые слова: парламент, парламентский контроль, разделение властей, законность, права человека, народовластие, демократия, правовой мониторинг.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85121985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-08DOI: 10.32743/2658-4077.2019.7.7.159
Yuri Kolin
In the article aspects of the impact of positive discrimination models on the level of vertical social mobility and prospects for economic growth have been analyzed. The necessity of creating and broad programs distribution of positive discrimination as an incentive for social integration and economic growth is substantiated. The relevance of the problem of applying positive discrimination models lies in their influence on the level of vertical social mobility, reduction of social polarization and economic growth in conditions of increasing trends in social polarization in the modern world. The goal of research is to analyze the impact of positive discrimination on flexibility, the level of vertical social mobility and the adaptive potential of the social system, and prospects for economic growth. No 7 (7), октябрь, 2019 г. The research methodology is based on a comparative analysis of social characteristics and economic growth rates of societies that demonstrate high and low levels of social inequality and vertical social mobility. As a theoretical basis, the results of studies on the correlation of social inequality and the level of vertical social mobility are analyzed including the context of intergenerational social dynamics, as well as historical experience with the use of positive discrimination models. The growing importance of positive discrimination is justified to reduce social inequality, to develop social integration and to strengthen vertical social mobility. The insufficient level of attention of researchers and government institutions to the problem of positive discrimination as a factor of reducing social polarization, enhancing the flexibility and diversity of the social system and accelerating economic growth is determined. The research novelty lies in the analysis of the positive discrimination policy as a factor in reducing social polarization, enhancing the flexibility and diversity of the social system and stimulating economic growth. Ключевые слова: социальное неравенство, социальная поляризация, общественная интеграция, инклюзивное общество, постматериалистические ценности, человеческий капитал, постиндустриальное общество, позитивная дискриминация, вертикальная социальная мобильность.
{"title":"POSITIVE DISCRIMINATION AS A FACTOR OF LIMITATION OF SOCIAL POLARIZATION AND STIMULUS TO ECONOMIC GROWTH (IN THE CONTEXT OF THE DISCUSSION ON PROSPECTS AFFIRMATIVE ACTION)","authors":"Yuri Kolin","doi":"10.32743/2658-4077.2019.7.7.159","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.7.7.159","url":null,"abstract":"In the article aspects of the impact of positive discrimination models on the level of vertical social mobility and prospects for economic growth have been analyzed. The necessity of creating and broad programs distribution of positive discrimination as an incentive for social integration and economic growth is substantiated. The relevance of the problem of applying positive discrimination models lies in their influence on the level of vertical social mobility, reduction of social polarization and economic growth in conditions of increasing trends in social polarization in the modern world. The goal of research is to analyze the impact of positive discrimination on flexibility, the level of vertical social mobility and the adaptive potential of the social system, and prospects for economic growth. No 7 (7), октябрь, 2019 г. The research methodology is based on a comparative analysis of social characteristics and economic growth rates of societies that demonstrate high and low levels of social inequality and vertical social mobility. As a theoretical basis, the results of studies on the correlation of social inequality and the level of vertical social mobility are analyzed including the context of intergenerational social dynamics, as well as historical experience with the use of positive discrimination models. The growing importance of positive discrimination is justified to reduce social inequality, to develop social integration and to strengthen vertical social mobility. The insufficient level of attention of researchers and government institutions to the problem of positive discrimination as a factor of reducing social polarization, enhancing the flexibility and diversity of the social system and accelerating economic growth is determined. The research novelty lies in the analysis of the positive discrimination policy as a factor in reducing social polarization, enhancing the flexibility and diversity of the social system and stimulating economic growth. Ключевые слова: социальное неравенство, социальная поляризация, общественная интеграция, инклюзивное общество, постматериалистические ценности, человеческий капитал, постиндустриальное общество, позитивная дискриминация, вертикальная социальная мобильность.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83793693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-08DOI: 10.32743/2658-4077.2019.7.7.160
V. Rodachin
The article substantiates the need to include in the unified state system of monitoring manifestations of religious and nationalist extremism as well as manifestations of political extremism, officially referred to the main threats of extremism in the Russian Federation. The author has developed and proposed criteria for assessing the manifestations of political extremism. Ключевые слова: политический экстремизм, протестная активность, мониторинг проявлений экстремизма, критерии оценки политического экстремизма.
{"title":"SIGNS OF ACTUALIZATION OF POLITICAL EXTREMISM AS A THREAT TO RUSSIA'S NATIONAL SECURITY","authors":"V. Rodachin","doi":"10.32743/2658-4077.2019.7.7.160","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.7.7.160","url":null,"abstract":"The article substantiates the need to include in the unified state system of monitoring manifestations of religious and nationalist extremism as well as manifestations of political extremism, officially referred to the main threats of extremism in the Russian Federation. The author has developed and proposed criteria for assessing the manifestations of political extremism. Ключевые слова: политический экстремизм, протестная активность, мониторинг проявлений экстремизма, критерии оценки политического экстремизма.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72394118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper details an experimental investigation, using a linear cascade, into the effects of real geometry features on the aerodynamic performance of stator blade rows within axial flow compressors. The specific geometric features investigated include shroud cavities, inter-platform gaps, vane-pack gaps and the effects of misalignment of the platform endwalls due to manufacturing tolerances. A computational investigation into these effects is also included. To ensure that the linear cascade measurements are representative of a multi-stage compressor environment a novel experimental technique was developed to generate a hub endwall boundary layer which had skew. The boundary layer skew generation method involves injecting flow along the cascade endwall in such a manner as to control both the displacement thickness and tangential momentum thickness of the resulting boundary layer. Without the presence of the endwall boundary layer skew the linear cascade could not reproduce the flow features typically observed in a multi-stage compressor. The investigation reveals that real geometry features can have a significant impact on the flowfield within a blade passage. For a shrouded stator, increasing the leakage flow rate increases the stagnation pressure loss coefficient. However, high levels of whirl pickup of the leakage flow as it passes through the stator-shroud cavity can offset the natural secondary flow within the stator passage and thus reduce the stagnation pressure loss. All of the steps and gaps that were observed to be present in real compressors were found to increase the stagnation pressure loss relative to that of a smooth endwall. It is also shown that the computational method is capable of capturing the trends observed in the experiments.
{"title":"Effects of Stator Platform Geometry Features on Blade Row Performance","authors":"D. J. Taylor, J. Longley","doi":"10.33737/JGPPS/111508","DOIUrl":"https://doi.org/10.33737/JGPPS/111508","url":null,"abstract":"This paper details an experimental investigation, using a linear cascade, into the effects of real geometry features on the aerodynamic performance of stator blade rows within axial flow compressors. The specific geometric features investigated include shroud cavities, inter-platform gaps, vane-pack gaps and the effects of misalignment of the platform endwalls due to manufacturing tolerances. A computational investigation into these effects is also included. \u0000To ensure that the linear cascade measurements are representative of a multi-stage compressor environment a novel experimental technique was developed to generate a hub endwall boundary layer which had skew. The boundary layer skew generation method involves injecting flow along the cascade endwall in such a manner as to control both the displacement thickness and tangential momentum thickness of the resulting boundary layer. Without the presence of the endwall boundary layer skew the linear cascade could not reproduce the flow features typically observed in a multi-stage compressor. \u0000The investigation reveals that real geometry features can have a significant impact on the flowfield within a blade passage. For a shrouded stator, increasing the leakage flow rate increases the stagnation pressure loss coefficient. However, high levels of whirl pickup of the leakage flow as it passes through the stator-shroud cavity can offset the natural secondary flow within the stator passage and thus reduce the stagnation pressure loss. All of the steps and gaps that were observed to be present in real compressors were found to increase the stagnation pressure loss relative to that of a smooth endwall. It is also shown that the computational method is capable of capturing the trends observed in the experiments.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45360653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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