基于无网格方法的膛口二次焰数值研究  

Numerical Research on Secondary Muzzle Flash Using Gridless Method

作　　者：吴伟[1] 许厚谦[1] 王亮[1] 薛锐[1] 

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《兵工学报》2014年第12期1991-1997,共7页Acta Armamentarii

摘　　要：基于最小二乘无网格方法,对包含高速运动弹丸的膛口二次焰流场进行了数值研究。流场采用含化学反应源项的任意拉格朗日-欧拉方程描述,对流项和反应源项采用多组分HLLC格式和有限速率反应模型计算,对于弹丸运动造成的点云畸形采用局部重构方法处理。对发射药中不添加/添加消焰剂以及不同膛口压力条件下的全流场进行数值计算。计算阴影图与实验照片吻合较好,并且计算结果表明:添加2%钾盐消焰剂或降低膛口压力30%可有效抑制膛口二次焰。The secondary muzzle flash,involving high-speed projectile,is numerically studied using a least-square gridless method.The fluid dynamics is modeled by arbitrary Lagrangian-Eulerian equations with chemical source term.The numerical flux and chemical kinetics are dealt with by multi-component HLLC scheme and the finite rate chemical model.A restructuring technique is adopted to dispose the freaky clouds due to the moving boundaries.The full flow fields are simulated to examine the effects of potassium salt flame suppressors and muzzle pressure on the muzzle flash.The computational shadowgraph is in good agreement with experimental shadowgraph.The results show that 2％ addition in potassium salt or 30％ reduction in muzzle pressure may inhibit the secondary muzzle flash effectively.

关 键 词：兵器科学与技术 无网格方法 非平衡反应流 动态点云 膛口流场 

分 类 号：TJ25[兵器科学与技术—武器系统与运用工程]