再生式液体发射药火炮燃烧室压力振荡数值仿真  

Numerical Simulation of Pressure Oscillation in Combustion Chamber of Regenerative Liquid Propellant Gun

作　　者：刘宁[1] 张相炎[1] 

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《系统仿真学报》2009年第11期3211-3214,共4页Journal of System Simulation

基　　金：南京理工大学博士生创新培养基金

摘　　要：再生式液体发射药火炮(RLPG)喷雾燃烧过程伴随着剧烈的压力振荡现象,为了研究其产生机理,建立了RLPG燃烧室颗粒轨道模型。气相用欧拉法描述,液相用拉格朗日法描述,方程组中的源相反映了气液两相间的相互作用。通过数值仿真模拟了燃烧室压力振荡现象,从声腔振荡和燃烧稳定性两方面分析了压力振荡的产生机理,结果表明燃烧室存在纵向声学振型,液体药燃烧稳定性与液体药燃速指数有关,燃速指数越大,燃烧越不稳定。The process of spray combustion in regenerative liquid propellant guns （RLPGs） is coupled closely with large high-frequency pressure oscillations. To study this phenomenon, a Particle Trajectory Model of the combustion chamber of an RLPG was established. The gas field was described by unsteady Euler system while the liquid phase was described by the Lagrangian approach. The interaction of the two phases was expressed in the source terms of the equations. High-frequency oscillations were generated naturally by numerical simulation. The acoustic modes and combustion instability were proposed to study the inspiring mechanism of the pressure oscillations in combustion chamber. The simulation results indicate that the longitudinal models are generated in the chamber. The liquid propellant combustion stability is related to the pre-exponential term in the burning rate and increasing the pre-exponential term appears to increase the magnitude of the oscillations.

关 键 词：液体发射药火炮 压力振荡 颗粒轨道模型 数值模拟 

分 类 号：TJ012.1[兵器科学与技术—兵器发射理论与技术]