爆炸波与超声速运动物体相互作用的数值研究

Numerical simulation of interaction of blast wave and supersonic moving body

针对在弹道靶及爆炸波装置上完成的实验,用数值方法来研究在比热为常数和层流情况下爆炸波与超声速飞行物体的相互作用。为了准确模拟爆炸波,首先通过有限体积法求解轴对称N-S方程计算了爆炸波流场,分析比较了数值干涉图和实验干涉图以及数值计算和实验得到的三个截面的密度分布曲线。其次以获得的轴对称流场为爆炸波初场,采用重叠网格技术,通过有限体积法求解三维层流N-S方程数值计算了在比热为常值和层流情况下爆炸波与超声速飞行物体的相互作用,得到了数值干涉图并与实验得到的干涉图进行了比较,分析了爆炸波对飞行物体表面压力的影响。

Based on the experiment in ballistic range with explosion device, a numerical simulation of the interaction of a supersonic moving body and a blast wave under the condition of a constant ratio of specific heat and laminar flow model is presented. First, the flow field of axisymmetric blast wave is simulated by solving the axisymmetric N-S equations using finite volume numerical method. The numerical interference pictures and the experimental interference pictures are analyzed and the profiles of numerical and experimental density distributions at three cross sections are compared. Taking the obtained axisymmetric field as the initial blast wave field and using multi-block overlapping grid technique, the interaction of blast wave with supersonic moving cone is simulated under the condition of constant ratio of specific heat and laminar flow by solving three dimensional laminar N-S equations using finite volume numerical method. The numerical interference pictures and experimental holographic interference pictures are compared , and the effect of the blast wave on the surface pressure of the moving body is analyzed.