Pub Date : 2023-11-21DOI: 10.1134/s001050822305009x
R. Liu, F.-F. Hu, D.-Y. Li, C.-X. Zhao, Y.-F. Cheng
Abstract
Temperature distribution characteristics are important for evaluating the combustion status, safety monitoring, and disaster diagnosis of combustible gases. Traditional colorimetric thermometry is difficult to measure the temperature of combustible gases for the lack of the grey-body in the burning processes. In the present study, a visible burning facility for combustible gases is designed, and the temperature characteristics are measured using an improved colorimetric pyrometer with auxiliary solid powders as a grey-body. In order to improve the temperature measurement accuracy of the system, the type, particle size, and concentration of the powders as well as the ignition delay time are studied. After many debugging experiments, it is found that the best measurement results are obtained for the 30/70 H2/air mixture with the tungsten powder with the mean particle size of 7.9 (mu)m, particle concentration of 21 g/m3, and ignition delay time of 80 ms. The results are corroborated with the previous studies.
{"title":"Influential Factors of a Novel Colorimetric Thermometry Developed for the Combustible Gases","authors":"R. Liu, F.-F. Hu, D.-Y. Li, C.-X. Zhao, Y.-F. Cheng","doi":"10.1134/s001050822305009x","DOIUrl":"https://doi.org/10.1134/s001050822305009x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Temperature distribution characteristics are important for evaluating the combustion status, safety monitoring, and disaster diagnosis of combustible gases. Traditional colorimetric thermometry is difficult to measure the temperature of combustible gases for the lack of the grey-body in the burning processes. In the present study, a visible burning facility for combustible gases is designed, and the temperature characteristics are measured using an improved colorimetric pyrometer with auxiliary solid powders as a grey-body. In order to improve the temperature measurement accuracy of the system, the type, particle size, and concentration of the powders as well as the ignition delay time are studied. After many debugging experiments, it is found that the best measurement results are obtained for the 30/70 H<sub>2</sub>/air mixture with the tungsten powder with the mean particle size of 7.9 <span>(mu)</span>m, particle concentration of 21 g/m<sup>3</sup>, and ignition delay time of 80 ms. The results are corroborated with the previous studies.</p>","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"17 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138523864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.1134/s0010508223050040
Yu. M. Mikhailov, V. V. Aleshin, L. V. Zhemchugova, V. S. Smirnov, D. Yu. Kovalev
Abstract
The possibility of using the method of flameless combustion of RDX in ballasted systems to produce composite materials containing copper and zinc particles has been studied. RDX was used as the initial energetic material, hexamethylene diisocyanate as the binder, copper hydroxocarbonate and copper oxalate were used as precursors. Highly porous composite materials containing nanosized particles of copper, zinc oxide or their mixtures were obtained by optimizing the flameless combustion conditions.
{"title":"Conversion of Copper and Zinc Compounds in the Flameless Combustion Wave of RDX","authors":"Yu. M. Mikhailov, V. V. Aleshin, L. V. Zhemchugova, V. S. Smirnov, D. Yu. Kovalev","doi":"10.1134/s0010508223050040","DOIUrl":"https://doi.org/10.1134/s0010508223050040","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibility of using the method of flameless combustion of RDX in ballasted systems to produce composite materials containing copper and zinc particles has been studied. RDX was used as the initial energetic material, hexamethylene diisocyanate as the binder, copper hydroxocarbonate and copper oxalate were used as precursors. Highly porous composite materials containing nanosized particles of copper, zinc oxide or their mixtures were obtained by optimizing the flameless combustion conditions.</p>","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"58 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138523866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.1134/s001050822305012x
F. A. Bykovskii, S. A. Zhdan, E. F. Vedernikov
Abstract
Regimes of continuous multifront detonation of two-phase mixtures of aviation kerosene and hot air are obtained for the first time and studied in a flow-type annular combustor 503 mm in diameter and 600 mm long. Air with a flow rate of 7.8–24 kg/s is preheated up to 600–1200 K by a firing method in the settling chamber by means of burning a stoichiometric H2–O2 mixture. Liquid kerosene is bubbled with air in the fuel injection system. The equivalence ratio of the fuel is 0.66–1.28. The influence of the air temperature on the region of continuous detonation, pressure in the combustor, and specific impulse is studied. Experiments with the air temperature in the interval 600–1200 K reveal regimes of continuous multifront detonation with one pair (frequency (1.2pm 0.1) kHz) or two pairs (frequency (2.4pm 0.2) kHz) colliding transverse detonation waves. Based on the stagnation pressure measured at the combustor exit, the thrust force and specific impulse are determined. It is shown that an increase in the air temperature assists in detonation burning of the two-phase kerosene–air mixture, but the degree of dissociation of combustion products increases, while the specific impulse of the thrust force decreases. The specific impulse increases if the amount of the fuel in the mixture is sufficiently small, and its maximum value with allowance for the energy of compressed air in receivers is approximately 2200 for the air temperature in the settling chamber equal to 600 K.
{"title":"Continuous Multifront Detonation of Kerosene Mixtures with Air Heated in the Settling Chamber","authors":"F. A. Bykovskii, S. A. Zhdan, E. F. Vedernikov","doi":"10.1134/s001050822305012x","DOIUrl":"https://doi.org/10.1134/s001050822305012x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Regimes of continuous multifront detonation of two-phase mixtures of aviation kerosene and hot air are obtained for the first time and studied in a flow-type annular combustor 503 mm in diameter and 600 mm long. Air with a flow rate of 7.8–24 kg/s is preheated up to 600–1200 K by a firing method in the settling chamber by means of burning a stoichiometric H<sub>2</sub>–O<sub>2</sub> mixture. Liquid kerosene is bubbled with air in the fuel injection system. The equivalence ratio of the fuel is 0.66–1.28. The influence of the air temperature on the region of continuous detonation, pressure in the combustor, and specific impulse is studied. Experiments with the air temperature in the interval 600–1200 K reveal regimes of continuous multifront detonation with one pair (frequency <span>(1.2pm 0.1)</span> kHz) or two pairs (frequency <span>(2.4pm 0.2)</span> kHz) colliding transverse detonation waves. Based on the stagnation pressure measured at the combustor exit, the thrust force and specific impulse are determined. It is shown that an increase in the air temperature assists in detonation burning of the two-phase kerosene–air mixture, but the degree of dissociation of combustion products increases, while the specific impulse of the thrust force decreases. The specific impulse increases if the amount of the fuel in the mixture is sufficiently small, and its maximum value with allowance for the energy of compressed air in receivers is approximately 2200 for the air temperature in the settling chamber equal to 600 K.</p>","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"3 3","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138523875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.1134/s0010508223050106
J.-L. Li, J. Guo, X.-X. Sun, F.-Q. Yang
Abstract
In this study, explosion venting of front, centrally, and rear ignited 9% methane–air mixtures has been conducted in a 1-m3 rectangular vessel with and without cylinders placed parallel to the venting direction. Three pressure peaks (P_{1}), (P_{2}), and (P_{rm ext}) caused by vent failure, flame-acoustic interaction, and external explosion, respectively, can be distinguished. The pressure peak (P_{1}) appears in all the tests and is insensitive to the ignition position, but the existence of obstacles increases its value. The pressure peak (P_{2}) only appears in the centrally and front ignited explosions without obstacles. The pressure peak (P_{rm ext}) can be observed in the rear ignition tests and is strengthened by the cylinders. The duration of the Helmholtz oscillations is longer in front ignition tests, whereas addition of cylinders had a minor effect on their frequency. This study also validates the ability of FLACS in predicting a vented methane–air explosion by comparing the simulated pressure–time histories and flame propagations with experimental results. FLACS can basically predict the shape of overpressure curves. If cylinders exist, the simulation results ensure better agreement with the experimental data because FLACS cannot simulate the flame-acoustic-interaction-induced pressure peak (P_{2}). The performance of FLACS is satisfactory in rear ignition tests because it calculates (P_{rm ext}) and obstacles’ effect on (P_{rm ext}) exactly. The flame behavior simulated by FLACS is similar to that in experiments, but the effect of the Taylor instability on the flame is not sufficiently considered.
摘要本研究采用前、中、后三种引燃方式进行爆炸通风% methane–air mixtures has been conducted in a 1-m3 rectangular vessel with and without cylinders placed parallel to the venting direction. Three pressure peaks (P_{1}), (P_{2}), and (P_{rm ext}) caused by vent failure, flame-acoustic interaction, and external explosion, respectively, can be distinguished. The pressure peak (P_{1}) appears in all the tests and is insensitive to the ignition position, but the existence of obstacles increases its value. The pressure peak (P_{2}) only appears in the centrally and front ignited explosions without obstacles. The pressure peak (P_{rm ext}) can be observed in the rear ignition tests and is strengthened by the cylinders. The duration of the Helmholtz oscillations is longer in front ignition tests, whereas addition of cylinders had a minor effect on their frequency. This study also validates the ability of FLACS in predicting a vented methane–air explosion by comparing the simulated pressure–time histories and flame propagations with experimental results. FLACS can basically predict the shape of overpressure curves. If cylinders exist, the simulation results ensure better agreement with the experimental data because FLACS cannot simulate the flame-acoustic-interaction-induced pressure peak (P_{2}). The performance of FLACS is satisfactory in rear ignition tests because it calculates (P_{rm ext}) and obstacles’ effect on (P_{rm ext}) exactly. The flame behavior simulated by FLACS is similar to that in experiments, but the effect of the Taylor instability on the flame is not sufficiently considered.
{"title":"Effect of the Ignition Position and Obstacle on Vented Methane–Air Deflagration","authors":"J.-L. Li, J. Guo, X.-X. Sun, F.-Q. Yang","doi":"10.1134/s0010508223050106","DOIUrl":"https://doi.org/10.1134/s0010508223050106","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this study, explosion venting of front, centrally, and rear ignited 9% methane–air mixtures has been conducted in a 1-m<sup>3</sup> rectangular vessel with and without cylinders placed parallel to the venting direction. Three pressure peaks <span>(P_{1})</span>, <span>(P_{2})</span>, and <span>(P_{rm ext})</span> caused by vent failure, flame-acoustic interaction, and external explosion, respectively, can be distinguished. The pressure peak <span>(P_{1})</span> appears in all the tests and is insensitive to the ignition position, but the existence of obstacles increases its value. The pressure peak <span>(P_{2})</span> only appears in the centrally and front ignited explosions without obstacles. The pressure peak <span>(P_{rm ext})</span> can be observed in the rear ignition tests and is strengthened by the cylinders. The duration of the Helmholtz oscillations is longer in front ignition tests, whereas addition of cylinders had a minor effect on their frequency. This study also validates the ability of FLACS in predicting a vented methane–air explosion by comparing the simulated pressure–time histories and flame propagations with experimental results. FLACS can basically predict the shape of overpressure curves. If cylinders exist, the simulation results ensure better agreement with the experimental data because FLACS cannot simulate the flame-acoustic-interaction-induced pressure peak <span>(P_{2})</span>. The performance of FLACS is satisfactory in rear ignition tests because it calculates <span>(P_{rm ext})</span> and obstacles’ effect on <span>(P_{rm ext})</span> exactly. The flame behavior simulated by FLACS is similar to that in experiments, but the effect of the Taylor instability on the flame is not sufficiently considered.</p>","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"26 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138523896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1134/S0010508223050118
E. Prokhorov
{"title":"Simulation of Gaseous Detonation of Hydrocarbon Fuel under Oxygen Lack","authors":"E. Prokhorov","doi":"10.1134/S0010508223050118","DOIUrl":"https://doi.org/10.1134/S0010508223050118","url":null,"abstract":"","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"6 1","pages":"620 - 625"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.1134/S0010508223050064
E. N. Bogdanov, R. A. Voronkov, V. N. Knyazev
{"title":"Determining the Parameters of the Jones–Wilkins–Lee Equation of State of Explosives on the Basis of Data Obtained by the Barrier Method","authors":"E. N. Bogdanov, R. A. Voronkov, V. N. Knyazev","doi":"10.1134/S0010508223050064","DOIUrl":"https://doi.org/10.1134/S0010508223050064","url":null,"abstract":"","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"56 1","pages":"576 - 581"},"PeriodicalIF":1.2,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.1134/s0010508223040093
K. E. Kovalev, D. A. Yagodnikov, A. N. Bobrov
{"title":"Non-Contact Acoustic Method for Determining the Pressure in the Combustion Chamber of a Model Solid Rocket Motor","authors":"K. E. Kovalev, D. A. Yagodnikov, A. N. Bobrov","doi":"10.1134/s0010508223040093","DOIUrl":"https://doi.org/10.1134/s0010508223040093","url":null,"abstract":"","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.1134/s0010508223040020
N. N. Fedorova
{"title":"Numerical Simulation of Thermal Choking of a Channel during Combustion of a Hydrogen–Air Mixture in a Supersonic Flow","authors":"N. N. Fedorova","doi":"10.1134/s0010508223040020","DOIUrl":"https://doi.org/10.1134/s0010508223040020","url":null,"abstract":"","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.1134/s001050822304010x
A. Yu. Dolgoborodov, B. D. Yankovskii, P. A. Arsenov, S. Yu. Anan’ev, L. I. Grishin, G. E. Val’yano, T. I. Borodina, G. S. Vakorina
{"title":"Electric-Spark Initiation of Nanothermites","authors":"A. Yu. Dolgoborodov, B. D. Yankovskii, P. A. Arsenov, S. Yu. Anan’ev, L. I. Grishin, G. E. Val’yano, T. I. Borodina, G. S. Vakorina","doi":"10.1134/s001050822304010x","DOIUrl":"https://doi.org/10.1134/s001050822304010x","url":null,"abstract":"","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-01DOI: 10.1134/s0010508223040032
A. V. Yarkov, A. D. Kiverin, I. S. Yakovenko
{"title":"Flame Acceleration in a Channel: Effects of the Channel Width and Wall Roughness","authors":"A. V. Yarkov, A. D. Kiverin, I. S. Yakovenko","doi":"10.1134/s0010508223040032","DOIUrl":"https://doi.org/10.1134/s0010508223040032","url":null,"abstract":"","PeriodicalId":10509,"journal":{"name":"Combustion, Explosion, and Shock Waves","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135005330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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