Pub Date : 2019-06-15DOI: 10.32743/2658-4077.2019.6.6.151
A. Kunitsin
{"title":"POLITICAL MEANINGS AND \"CARE\"","authors":"A. Kunitsin","doi":"10.32743/2658-4077.2019.6.6.151","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.6.6.151","url":null,"abstract":"","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"73 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75279715","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 : 2019-06-08DOI: 10.32743/2658-4077.2019.4.4.119
A. Kovbasa, Mihail Maltsev
The activity of J.B. Colbert in the development of the French economy, science and culture. The contribution of J.B. Colbert in the establishment of the absolutist regime in France in the seventeenth century. Ключевые слова: Абсолютизм, Франция, меркантилизм, Кольбер.
{"title":"CONTRIBUTION OF J.B. COLBER IN THE FORMATION OF ABSOLUTISM IN FRANCE","authors":"A. Kovbasa, Mihail Maltsev","doi":"10.32743/2658-4077.2019.4.4.119","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.4.4.119","url":null,"abstract":"The activity of J.B. Colbert in the development of the French economy, science and culture. The contribution of J.B. Colbert in the establishment of the absolutist regime in France in the seventeenth century. Ключевые слова: Абсолютизм, Франция, меркантилизм, Кольбер.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"62 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74848498","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}
Labyrinth seals are widely used in rotating machinery and can be prone to aeroelastic instabilities. The rapid development of computational fluid dynamics now provides a high-fidelity approach for predicting the aeroelastic behavior of labyrinth seals in three dimension and exhibits great potential within industrial application, especially during the detailed design stages. In the current publication a time-marching unsteady Reynolds-averaged Navier-Stokes solver was employed to study the various historically identified parameters that have essential influence on the stability of labyrinth seals. The findings from the numerical approach agree well with analytical criteria in determining the overall stability of the seal structure while being able to capture the acoustic behavior of the upstream or downstream large cavities and its influence on the inter-fin cavities. The high-fidelity approach provides additional insights on the effects of nodal diameter, travelling wave direction, pressure ratio, and the linearity of the phenomenon for relatively large vibration amplitudes, all of which can aid during the design space exploration.
{"title":"Parametric study on the aeroelastic stability of rotor seals","authors":"Qi Zhuang, R. Bladh, E. Munktell, Yong Lee","doi":"10.33737/JGPPS/110751","DOIUrl":"https://doi.org/10.33737/JGPPS/110751","url":null,"abstract":"Labyrinth seals are widely used in rotating machinery and can be prone to aeroelastic instabilities. The rapid development of computational fluid dynamics now provides a high-fidelity approach for predicting the aeroelastic behavior of labyrinth seals in three dimension and exhibits great potential within industrial application, especially during the detailed design stages. In the current publication a time-marching unsteady Reynolds-averaged Navier-Stokes solver was employed to study the various historically identified parameters that have essential influence on the stability of labyrinth seals. The findings from the numerical approach agree well with analytical criteria in determining the overall stability of the seal structure while being able to capture the acoustic behavior of the upstream or downstream large cavities and its influence on the inter-fin cavities. The high-fidelity approach provides additional insights on the effects of nodal diameter, travelling wave direction, pressure ratio, and the linearity of the phenomenon for relatively large vibration amplitudes, all of which can aid during the design space exploration.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47205018","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 : 2019-04-08DOI: 10.32743/2658-4077.2019.3.3.99
V. Khibarin
{"title":"DOMESTIC METAPHOR IN CONCEPTUAL REPRESENTATION OF RUSSIAN NATIONAL IDEOLOGY","authors":"V. Khibarin","doi":"10.32743/2658-4077.2019.3.3.99","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.3.3.99","url":null,"abstract":"","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"29 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87027731","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 : 2019-04-08DOI: 10.32743/2658-4077.2019.3.3.98
A. Kiyashchenko
The article discusses the influence of the social position of the small landed gentry on the psychological attitudes associated with the perception of such concepts as honor and nobility. Attention is focused on the mutual relations of small landowners with their serfs, and on intra-estate communication, among other strata of the noble class. Ключевые слова: честь, благородство, дворянство, мелкопоместные.
{"title":"SPECIFICITY OF PERCEPTION OF A MORAL CATEGORY OF HONOR IN THE ENVIRONMENT OF A SINGLE-PLACE NOBILITY OF THE END OF THE XVIII - THE BEGINNING OF THE XX CENTURY","authors":"A. Kiyashchenko","doi":"10.32743/2658-4077.2019.3.3.98","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.3.3.98","url":null,"abstract":"The article discusses the influence of the social position of the small landed gentry on the psychological attitudes associated with the perception of such concepts as honor and nobility. Attention is focused on the mutual relations of small landowners with their serfs, and on intra-estate communication, among other strata of the noble class. Ключевые слова: честь, благородство, дворянство, мелкопоместные.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"22 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77865692","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 development of hub and casing boundary layers through a turbomachine is difficult to predict, giving rise to uncertainty in the boundary conditions experienced by each blade row. Previous studies in turbine cascades disagree on the sensitivity of endwall loss to such inlet conditions. This paper explores the problem computationally, by examining a large number of turbine cascades and varying the inlet boundary layer thickness. It is demonstrated that the sensitivity of endwall loss to inlet conditions is design dependent, and determined by the component of endwall loss associated with the secondary flow. This Secondary-Flow-Induced loss is characterised by a vorticity factor based on classical secondary flow theory. Designs that produce high levels of secondary vorticity tend to generate more loss and are more sensitive to inlet conditions. This sensitivity is largely driven by the dissipation of Secondary Kinetic Energy (SKE): thickening the inlet boundary layer causes the secondary vorticity at the cascade exit to be more dispersed within the passage, resulting in larger secondary flow structures with higher SKE. The effects are captured using a simple streamfunction model based on classical secondary flow theory, which has potential for preliminary design and sensitivity assessment.
{"title":"The sensitivity of turbine cascade endwall loss to inlet boundary layer thickness","authors":"J. Coull, C. Clark, R. Vázquez","doi":"10.22261/JGPPS.OEYMDE","DOIUrl":"https://doi.org/10.22261/JGPPS.OEYMDE","url":null,"abstract":"The development of hub and casing boundary layers through a turbomachine is difficult to predict, giving rise to uncertainty in the boundary conditions experienced by each blade row. Previous studies in turbine cascades disagree on the sensitivity of endwall loss to such inlet conditions. This paper explores the problem computationally, by examining a large number of turbine cascades and varying the inlet boundary layer thickness.\u0000It is demonstrated that the sensitivity of endwall loss to inlet conditions is design dependent, and determined by the component of endwall loss associated with the secondary flow. This Secondary-Flow-Induced loss is characterised by a vorticity factor based on classical secondary flow theory. Designs that produce high levels of secondary vorticity tend to generate more loss and are more sensitive to inlet conditions. This sensitivity is largely driven by the dissipation of Secondary Kinetic Energy (SKE): thickening the inlet boundary layer causes the secondary vorticity at the cascade exit to be more dispersed within the passage, resulting in larger secondary flow structures with higher SKE. The effects are captured using a simple streamfunction model based on classical secondary flow theory, which has potential for preliminary design and sensitivity assessment.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45031598","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 : 2019-02-15DOI: 10.32743/2658-4077.2019.2.2.64
A. Goncharova
The significance of the study lies in the fact that in a number of knowledge-intensive high-tech areas the Republic of Belarus has world-class innovation. These are developments in the field of agricultural production, automated management, production of new materials and substances, other areas of scientific and innovative development, which determine the creation of industries and industries corresponding to the highest technological structures. The main activities in the Republic of Belarus are characterized by the production of III and IV technological orders, a small part corresponds to V mode, which significantly narrows the investment basis of modernization. Ключевые слова: модернизация, технологии, научные разработки, агропромышленный комплекс, Республика Беларусь.
{"title":"METHODOLOGICAL SUPPORT OF MODERNIZATION OF TECHNOLOGIES OF SCIENTIFIC DEVELOPMENTS OF AGRICULTURE OF THE REPUBLIC OF BELARUS","authors":"A. Goncharova","doi":"10.32743/2658-4077.2019.2.2.64","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.2.2.64","url":null,"abstract":"The significance of the study lies in the fact that in a number of knowledge-intensive high-tech areas the Republic of Belarus has world-class innovation. These are developments in the field of agricultural production, automated management, production of new materials and substances, other areas of scientific and innovative development, which determine the creation of industries and industries corresponding to the highest technological structures. The main activities in the Republic of Belarus are characterized by the production of III and IV technological orders, a small part corresponds to V mode, which significantly narrows the investment basis of modernization. Ключевые слова: модернизация, технологии, научные разработки, агропромышленный комплекс, Республика Беларусь.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"20 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82369359","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 : 2019-02-15DOI: 10.32743/2658-4077.2019.2.2.65
Valeriia Malamura
Inclusive cultural project is completely new concept for the Russian Federation, but number of Russian regions are supporting such projects by state authorities as socially significant initiatives. The article reveals the main measures of state support for inclusive cultural projects, problems of interaction and recommendations for cooperation between the authorities and the organizers.
{"title":"MEASURES OF STATE SUPPORT OF INCLUSIVE CULTURAL PROJECTS","authors":"Valeriia Malamura","doi":"10.32743/2658-4077.2019.2.2.65","DOIUrl":"https://doi.org/10.32743/2658-4077.2019.2.2.65","url":null,"abstract":"Inclusive cultural project is completely new concept for the Russian Federation, but number of Russian regions are supporting such projects by state authorities as socially significant initiatives. The article reveals the main measures of state support for inclusive cultural projects, problems of interaction and recommendations for cooperation between the authorities and the organizers.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":"23 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81721869","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}
Accurate analysis of the performance of a turbine blade cooling system is essential to allow the blade life to be safely predicted. The latter is essential as the business model for an engine can be strongly dependent on the duration between engine shop visits. Some recent heat transfer research has focused on increasing heat transfer levels in order to reduce turbine blade metal temperatures, however for engine designers it is the life of the blade, determined in part by the stress levels within it, that are of main concern. This paper uses heat transfer and stress analysis within the same software environment to examine the influence of the HTC levels in different regions of an engine representative leading edge impingement cooling system on both metal temperature and stress levels. The results of these analyses are then combined to show that, with attention to cooling in different regions of the blade, reductions in stress levels of 6% can be achieved in the most highly stressed regions of the blade with achievable alterations in heat transfer levels.
{"title":"Influence of HTC levels on temperature and stress levels in a leading edge impingement system","authors":"R. Pearce, P. Ireland, Edwin Dane","doi":"10.22261/JGPPS.WLAL1F","DOIUrl":"https://doi.org/10.22261/JGPPS.WLAL1F","url":null,"abstract":"Accurate analysis of the performance of a turbine blade cooling system is essential to allow the blade life to be safely predicted. The latter is essential as the business model for an engine can be strongly dependent on the duration between engine shop visits. Some recent heat transfer research has focused on increasing heat transfer levels in order to reduce turbine blade metal temperatures, however for engine designers it is the life of the blade, determined in part by the stress levels within it, that are of main concern. This paper uses heat transfer and stress analysis within the same software environment to examine the influence of the HTC levels in different regions of an engine representative leading edge impingement cooling system on both metal temperature and stress levels. The results of these analyses are then combined to show that, with attention to cooling in different regions of the blade, reductions in stress levels of 6% can be achieved in the most highly stressed regions of the blade with achievable alterations in heat transfer levels.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48168877","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}
A numerical study on the influence of compressor blade aspect ratio on profile and secondary loss has been conducted. In order to more accurately estimate the change in secondary loss, a new analytical model has been developed. The aspect ratio has been increased by reducing blade chord while maintaining blade height and solidity. A simplified compressor cascade geometry and an engine-like HPC stage geometry (rotor blade and stator vane) have been analysed with 3D CFD simulations. For these simulations, the solver TRACE has been used together with the k-ω turbulence model and a Low-Reynolds approach. A negative effect of increased aspect ratio on profile loss due to the lower Reynolds number has been observed as expected from literature. Moreover a decrease of secondary loss at increased aspect ratio due to smaller endwall regions has been noticed. While this effect is also well known, a significant influence of the assumptions regarding the incoming boundary layer thickness has been observed based on the cascade simulations. This leads to the conclusion that changing the aspect ratio of all blades and vanes of a multistage compressor causes a much stronger decrease in secondary loss per blade row than changing the aspect ratio of a single rotor or stator within the compressor. In literature so far only the first case is considered in common loss correlations. However considering the latter would increase the accuracy of secondary loss estimation for a non-uniform change in aspect ratio within a compressor.
{"title":"Influence of Blade Aspect Ratio on Axial Compressor Efficiency","authors":"M. Peters, T. Schmidt, P. Jeschke","doi":"10.33737/jgpps/111735","DOIUrl":"https://doi.org/10.33737/jgpps/111735","url":null,"abstract":"A numerical study on the influence of compressor blade aspect ratio on profile and secondary loss has been conducted. In order to more accurately estimate the change in secondary loss, a new analytical model has been developed. The aspect ratio has been increased by reducing blade chord while maintaining blade height and solidity. A simplified compressor cascade geometry and an engine-like HPC stage geometry (rotor blade and stator vane) have been analysed with 3D CFD simulations. For these simulations, the solver TRACE has been used together with the k-ω turbulence model and a Low-Reynolds approach. A negative effect of increased aspect ratio on profile loss due to the lower Reynolds number has been observed as expected from literature. Moreover a decrease of secondary loss at increased aspect ratio due to smaller endwall regions has been noticed. While this effect is also well known, a significant influence of the assumptions regarding the incoming boundary layer thickness has been observed based on the cascade simulations. This leads to the conclusion that changing the aspect ratio of all blades and vanes of a multistage compressor causes a much stronger decrease in secondary loss per blade row than changing the aspect ratio of a single rotor or stator within the compressor. In literature so far only the first case is considered in common loss correlations. However considering the latter would increase the accuracy of secondary loss estimation for a non-uniform change in aspect ratio within a compressor.","PeriodicalId":53002,"journal":{"name":"Journal of the Global Power and Propulsion Society","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41620792","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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