再生式液体发射药火炮燃烧室内两相流模型  

Two-phase Flow Model 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,江苏南京210094

出　　处：《南京理工大学学报》2010年第3期347-351,共5页Journal of Nanjing University of Science and Technology

摘　　要：为研究再生式液体发射药火炮(RLPG)内弹道过程,建立了RLPG燃烧室内的一维两相流数学模型,气相控制方程为非稳态欧拉方程组,液相控制方程用拉格朗日方程描述,方程组的源项反映了气液两相之间的耦合。分别采用二阶精度的MacCormack预估校正二步差分格式计算气相控制方程,求解析解的方法计算液相控制方程,PSI-Cell方法处理气液之间的耦合过程。通过数值仿真模拟了RLPG喷雾燃烧过程和压力振荡现象,建立了纵向二阶压力振荡振型,得到了主要物理参量的时空分布情况并讨论了主要结构参数对膛内过程的影响。仿真结果显示:由于身管入口的节流作用,使得燃烧室内的燃气压力和速度波动幅度都比身管内的要大;增大活塞差动面积比和喷孔面积都会引起膛压升高,压力振荡幅值增大。To study the interior ballistic process of a regenerative liquid propellant gun（RLPG）,a one-dimensional two-phase flow mathematical model in the combustion chamber of a RLPG is established.The gas phase control equation is unsteady Euler equations while the liquid phase control equation is described by Lagrangian equation.The coupling of the two phases is implicated in the source terms of equations.The gas phase control equations are calculated by MacCormack＇s two-step predictor-corrector difference scheme of second order accuracy and the analytic method is used for calculation of the liquid phase control equation.A PSI-Cell method is used for the coupling of gas and liquid phases.The process of spray combustion of a RLPG and pressure oscillations is simulated,the second order longitudinal mode of the pressure oscillation is set up by numerically simulation.The time-space distributions of main physical parameters are obtained and the effects of structure parameters on the process in the chamber are discussed.The simulation results show the gas pressure and the velocity fluctuation range in the chamber are larger than those in the tube due to the throttling action of tube entrance.The chamber pressure and its oscillation amplitude increase with the enlargement of the differential area ratio and the nozzle area of a piston.

关 键 词：再生式液体发射药火炮 燃烧室 两相流 喷雾燃烧 压力振荡 

分 类 号：TJ302[兵器科学与技术—火炮、自动武器与弹药工程]