基于完全变光滑长度SPH方法的高能炸药爆轰过程数值试验  

Numerical Simulation of High Explosive Detonation Process Using SPH Method with Fully Variable Smoothing Lengths

作　　者：强洪夫[1] 王坤鹏[1] 高巍然[1] 

机构地区：[1]第二炮兵工程学院201室,陕西西安710025

出　　处：《含能材料》2009年第1期27-31,共5页Chinese Journal of Energetic Materials

基　　金：国家教育部NCET资助项目;国家973资助项目(973-61338);第二炮兵工程学院创新性探索研究资助项目(EPXY0806)

摘　　要：传统的网格方法在模拟高能炸药(HE)爆炸问题时常会出现网格扭曲等问题,光滑粒子流体动力学(smoothed particle hydrodynamics)方法是一种无网格纯Lagrangian粒子方法,非常适合求解这类问题。本文应用作者提出的完全变光滑长度SPH方法,修正了传统SPH法中由于变光滑长度效应所造成的计算误差,其在模拟密度等物理参量变化梯度剧烈的问题时比传统SPH法具有更高精度和稳定性;针对一维TNT板条爆轰过程和三维TNT聚能装药的爆轰过程两个算例进行了数值试验,并与已有的传统SPH法数值模拟结果及理论解进行了对比。结果表明,算例一说明该方法较传统SPH法在模拟此类问题时具有更高精度,比传统方法计算的CJ参数更接近理论值,验证了该方法在爆轰过程模拟的有效性;算例二说明该方法成功地进行了三维TNT聚能装药的爆轰过程数值试验,获得了爆轰产物气流的传播特性和喷射规律并符合爆炸理论。The numerical simulation of the detonation of a high explosive （HE） is difficult for traditional grid based methods due to the mesh distortion. Smoothed particle hydrodynamics （SPH） method, as a Lagrangian particle method,is a best candidate method to solve this kind of problem. Modified SPH method presented by the authors with fully variable smoothing length corrects the variable smoothing length effects of standard SPH method in essence,and improves the simulation precision and stability in the large density gradient problem. 1D TNT slab detonation and 3D TNT shaped charge were simulated with the new method and compared with the standard SPH method and theoretical value. The results show that the new SPH method improves the precision and computes the CJ value more correctly. With the numerical simulation for detonation process of the 3D TNT shaped charge,the properties and the rule of the gaseous detonation products were obtained. The results accord with the explosion theoretical value.

关 键 词：爆炸力学 光滑粒子流体动力学 变光滑长度 聚能装药 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]