导流锥结构参数对燃气弹射筒内压力冲击平滑效果影响研究

Influence of Structural Parameters of Diversion Cone on Smooth Effect of Gas Ejection Bottom Pressure Impact

针对导流锥结构参数对内弹道流场耦合影响问题,基于动态分层动网格技术,构建了含导弹运动和二次燃烧的内弹道数值模型,并验证了模型可靠性。解耦分析了导流锥半径、高度及冲击高度对内弹道流场特性和载荷的影响。结果表明:导流锥的结构直接决定燃气飞溅现象的产生和流场结构的紊乱程度,导流锥的半径、高度和冲击高度的改变会对燃气反射点的位置、二次燃烧的区域以及剧烈程度产生影响;结构优化后的导流锥,较大程度地缓解了冲击现象,获得了较好的平滑效果,筒底压力较实验装置降低了24.5%。

For the problem of the effects of the structure parameters of the diversion cone on the internal ballistic flow field coupling,dynamic layered dynamic grid technology are used to establish the internal ballistic numerical model coupling missile movement and secondary combustion,its reliability is verified by the experiment. Based on the theory model,it is decoupling analyzed the effects of three structure parameters on the flow field characteristics and the interior ballistic load,which are the radius,height and impact height of the diversion cone. The results show that the structure of the diversion cone directly determines the generation of gas splash and the disorder of the flow field structure. The change of the radius,height and impact height of the diversion cone will change the position of the gas reflection point,the area of secondary combustion and the intensity. The structural optimization greatly alleviated the impact phenomenon and achieved the best smoothing effect. Bottom pressure compared to experimental device is reduced by 24.5%.