中文摘要：

这研究的目的是调查控制一支装载体积的推进的枪(BLPG ) 的内部弹道的稳定性的工具。在一个圆柱的步墙燃烧房间的成双的燃烧气体喷气和液体媒介的相互作用的实验详细被进行获得喷气扩大的时间系列过程，并且在一样的工作条件下面的数字模拟也被进行由比较数字结果和试验性的结果验证数字方法的可靠性。从这，相互的干扰和在液体媒介的多重燃烧气体喷气(四，六，和八口喷气)的扩大特征上的数字模拟被执行，并且压力的分发特征，速度，温度，并且泰勒洞的进化进程并且喷气流动地优化详细被获得。数字模拟的结果证明当燃烧气体喷气的不同数字在液体媒介膨胀时，有喷气流动地里的旋涡的二种不同类型，包括气体的旋涡在泰勒洞以内分阶段执行的步和逆流附近的液体阶段的角落旋涡。因为旋涡的这二种类型，当燃烧气体喷气的变化数字能在喷气扩大过程制止 KelvinHelmholtz 不稳定性到某个度时，喷气的光线的扩大特征被增加，它能最后实现控制 BLPG 的内部弹道的稳定性的目标。为压制 KelvinHelmholtz 不稳定性并且支持泰勒洞的光线的扩大的最佳方法能被在喷气流动域里分析典型参数的变化决定。

英文摘要：

The purpose of this study is to investigate means of controlling the interior ballistic stability of a bulk-loaded propellant gun（BLPG）.Experiments on the interaction of twin combustion gas jets and liquid medium in a cylindrical stepped-wall combustion chamber are conducted in detail to obtain time series processes of jet expansion,and a numerical simulation under the same working conditions is also conducted to verify the reliability of the numerical method by comparing numerical results and experimental results.From this,numerical simulations on mutual interference and expansion characteristics of multiple combustion gas jets（four,six,and eight jets） in liquid medium are carried out,and the distribution characteristic of pressure,velocity,temperature,and evolutionary processes of Taylor cavities and streamlines of jet flow Held are obtained in detail.The results of numerical simulations show that when different numbers of combustion gas jets expand in liquid medium,there are two different types of vortices in the jet flow field,including corner vortices of liquid phase near the step and backflow vortices of gas phase within Taylor cavities.Because of these two types of vortices,the radial expansion characteristic of the jets is increased,while changing numbers of combustion gas jets can restrain Kelvin-Helmholtz instability to a certain degree in jet expansion processes,which can at last realize the goal of controlling the interior ballistic stability of a BLPG.The optimum method for both suppressing Kelvin-Helmholtz instability and promoting radial expansion of Taylor cavities can be determined by analyzing the change of characteristic parameters in a jet flow field.