燃气射流驱动液柱和堵片相互作用特性分析

Characteristics of the Interaction Between Gas Jet Driven Liquid Columns and Plug Plates

为了研究单兵无后坐力炮含液柱平衡体发射时降低尾喷发射特征的效果,利用Ansys Fluent流体力学计算软件,基于6DOF动网格技术和VOF多相流计算方法,对燃气射流驱动液柱和堵片的相互作用特性进行了数值模拟,分析了燃气射流驱动液柱和堵片之间的相互作用特性,并与不含液柱平衡体发射时的流场计算结果进行对比。结果表明:含液柱发射时,液柱受火药燃气推力和堵片的阻碍作用,在出喷管后会迅速发生多次破碎并充分雾化,并且液相会受到火药燃气射流的卷吸作用,将燃气射流包裹在液相内,从而达到降低尾喷发射特征的目的。与不含液柱发射的情况相比,尾喷流场形成的冲击波压强峰值降低了29.5%;射流顶端流场的发展区域,速度峰值降低了48.0%,温度峰值降低了29.0%;堵片在运行过程中的最大速度降低了17.5%。

To study the effect of reducing the emission characteristics of the back blast when a recoilless gun was launched with the liquid column balance body.By using the Ansys Fluent fluid mechanics simulation based on the 6DOF dynamic grid technology and the VOF multiphase flow calculation met-hod,the interaction between the liquid column driven by gas jets and the plug plate was analyzed.The simulation results were compared with the flow field computation results in the case of the balance body being launched without a liquid column.The results showed that the liquid column was blocked by the gunpowder gas thrust and the plug plate,and it would be broken up and fully atomized after exiting the nozzle.Also,the liquid would entrain gunpowder gas jet under its influences so that the reduction of the emission signatures of the back blast was achieved.Compared with the situation of launching wit-hout a liquid column,the peak pressure of the shock wave formed by the jet flow field was reduced by 29.5%;the peak velocity of the flow field at the tip of the jet,48%;the peak temperature,29%;and the maximum velocity of the plug plate in motion,17.5%.