点火管气固两相流模拟喷射装置的设计与计算

Design and Calculation of Simulating Injection Device for Gas-Solid Two-Phase Flow in Igniter Tube

为了研究火炮装药床中的点传火特性,根据高低压发射原理,设计了一种点火管气固两相流的模拟喷射装置,建立了模拟装置中高低压室的内弹道方程组,并进行了数值计算。计算结果表明,通过调整装药量、药形参数、节流孔面积及喷孔面积的大小,可以满足点火管多种工况下模拟实验的要求。对于单孔管状药,增大装药量或者减小弧厚,均可以使破膜时间提前,稳定喷射持续时间延长;增大节流孔面积或者喷孔面积,均会导致稳定喷射时的平均压力降低。

In order to study the ignition characteristics in the gun charge bed,a kind of simulating injection device for the gas-solid two-phase flow in the igniter tube was designed based on the high-low pressure launching principle.The interior ballistic equation group of high-low pressure chambers in the simulator was established and solved by means of numerical method.The calculation results showed that the different working conditions of the igniter tube can be simulated by use of adjusting the mass and shape of charge,the areas of the throttle and the nozzle hole.Thus this can meet the requirements of simulation and test of the igniter tube under different working conditions.With relation to cylindrical monoperforated grains,increasing the charge mass or decreasing the thickness of arc,all of these can bring forward the diaphragm breaking time and prolong the stable injecting duration time.The average pressure of stable injection can decrease with the area increase of the throttle or the nozzle holes.