Simulation on the flow characteristics of multi-stage divergent combustion chamber of combustion light gas gun
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摘要: 为了分析多级渐扩型燃烧室结构对燃烧轻气炮氢氧燃烧特性的影响, 通过计算流体力学方法, 分别对采用传统圆柱型燃烧室和多级渐扩型燃烧室的燃烧轻气炮氢氧燃烧发射过程进行数值模拟。对比结果表明, 多级渐扩型燃烧室结构能够明显地减小燃烧室压力波动幅度, 提高氢氧燃烧稳定性; 多级渐扩型燃烧室内形成回流区, 可以减小气流轴向运动速度; 火焰扩展形态与渐扩型结构相吻合, 燃烧反应区表面变化平稳; 多级渐扩型燃烧室结构对氢氧火焰传播过程和压力波动现象有着重要影响。Abstract: In order to analyze influences of multistage divergent chamber structure of combustion light gas gun on the combustion characteristics of hydrogen-oxygen mixed gas, the propellant combustion launching process in the multistage divergent chamber and standard cylinder chamber combustion light gas gun was simulated with the computational fluid dynamics method respectively.Comparative results show that the pressure fluctuations in the chamber of combustion light gas gun are significantly reduced by using the multistage divergent combustion chamber structure, while the stability of hydrogen-oxygen mixed gas combustion is improved.Recirculation zones would be formed in the multistage divergent chamber, which can reduce the flow axial velocity.The flame shape and the divergent chamber structure coincide with each other during its expanding.The surface of combustion zones develops steady.The multistage divergent combustion chamber structure has considerable impact on the flame expansion process and pressure fluctuations in the combustion chamber.
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图 1 燃烧轻气炮多级渐扩型燃烧室结构
Figure 1. Multistage divergent chamber structure of combustion light gas gun
图 2 弹底压力数值模拟与实验结果对比图
Figure 2. Comparison of the projectile base pressure between simulation and experiment
图 3 单点点火时燃烧室结构对膛底压力和弹底压力的影响
Figure 3. Influences of chamber structure on chamber bottom and projectile base pressures with single-point ignition
图 4 多点点火时燃烧室结构对膛底压力和弹底压力的影响
Figure 4. Influences of chamber structure on chamber bottom and projectile base pressures with multi-point ignition
图 5 t=3.36 ms时4级渐扩型燃烧室流场速度矢量和流线分布图
Figure 5. Velocity vector and streamline distribution of four-stage divergent chamber flow field at t=3.36 ms
图 6 不同燃烧室结构内3个记录点的轴向速度随时间变化曲线
Figure 6. Velocity curve of the three probe points in different chamber structures
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[1] Kruczynski D, Massey D. Combustion light gas gun technology demonstration[R]. ADA462130, 2007. [2] Kruczynski D, Witherspoon F, Massey D, et al. Experimental in a 45-mm combustion light gas gun: An innovative approach to hypervelocity[C]//JANNAF Propulsion Meeting. Cleveland Ohio, 1998. [3] Liu Ning, Zhang Xiang-yan. Quasi-dimensional interior ballistic model and numerical simulation of combustion light gas gun[C]//Proceedings of the 26th International Symposium on Ballistics. Miami, USA, 2011: 625-632. [4] Tally R L, Bracuti A. Diagnostics of combustion evolution in a bulk-loaded LP gun[R]. A100290, 1990. [5] Despirito J. CFD analysis of the interior ballistics of the bulk-loaded liquid propellant gun[C]//The 32nd AIAA Joint Propulsion Conference. Alexander, 1996. [6] 薛晓春, 余永刚, 张琦.双股燃气射流在充液室内扩展特性的实验研究[J].爆炸与冲击, 2013, 33(5): 449-455. http://www.cnki.com.cn/Article/CJFDTotal-BZCJ201305001.htmXue Xiao-chun, Yu Yong-gang, Zhang Qi. Experiment study on expansion characteristics of twin combustion-gas jets in liquid-filled chambers[J]. Explosion and Shock Waves, 2012, 33(5): 449-455. http://www.cnki.com.cn/Article/CJFDTotal-BZCJ201305001.htm [7] 薛晓春, 余永刚, 张琦.双束燃气射流与整装式液体装药相互作用的实验和数值模拟[J].兵工学报, 2013, 34(6): 669-677. http://www.cqvip.com/QK/94928X/201306/46418535.htmlXue Xiao-chun, Yu Yong-gang, Zhang Qi. Experiment and numerical simulation for interaction of twin gas jets and bulk-loaded liquid charge[J]. Acta Armamentarii, 2013, 34(6): 669-677. http://www.cqvip.com/QK/94928X/201306/46418535.html [8] 莽姗姗, 余永刚.高压燃气射流在整装液体中扩展过程的实验和数值模拟[J].爆炸与冲击, 2011, 31(3): 300-305. http://d.wanfangdata.com.cn/Periodical/bzycj201103014Mang Shan-shan, Yu Yong-gang. Experiment and numerical simulation for high pressure combustible gas jet expansion process in a bulk-loaded liquid[J]. Explosion and Shock Waves, 2011, 31(3): 300-305. http://d.wanfangdata.com.cn/Periodical/bzycj201103014 [9] 解茂昭.内燃机计算燃烧学[M].大连: 大连理工大学出版社, 2005: 4-5. [10] Versteeg H K, Malalasekera W. An introduction to computational fluid dynamics: The finite volume method[M]. 2nd ed. London: Pearson Education Limited, 2007: 72-80. -
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