超高速发射实验模型的数值计算

 采用三阶精度PPM（Parabolic Piecewise Method）方法和VOF（Volume of Fluid）相结合，运用Lagrange-Remapping算法，编制了多介质流体高精度欧拉计算程序MFPPM，可以对多介质复杂流场进行数值计算。对程序计算精度进行了测试，并应用于超高速发射实验模型数值计算，对Sandia实验室不带会聚作用的实验模型进行了一维计算以及带会聚作用的实验模型进行二维计算并与其实验结果和CTH计算结果进行对比，其中一维计算最大相对误差1%，二维计算相对误差4.7%，在此基础上对超高速发射设计模型进行了初步计算。

Numerical Simulation of the Experimental Hypervelocity Launcher

According to observation results of explosive dispersion process of FAE(fuel-air explosive)test device with fast kinematics analysis system,the different dispersion stages of fuel were characterized and the influence of specific central explosive,ratio of height to diameter and shell material to fuel dispersion was studied in this paper.The results show that dispersion process can be divided into the following three phases,jet formation and expansion movement phase,two-direction expansion movement phase and gas-liquid amalgamation movement phase.The different stages of fuel dispersion process correspond with different hydrodynamics characteristics and contribute to the formation of cloud in respective.Under the conditions of general optimization of test device, cloud area and volume were expanded by properly increasing specific central explosive. The ratio of height to diameter was not a remarkable factor influencing cloud status,but larger ratio of height to diameter dispersed fuel better.Cloud dispersion of steel shell was better than that of aluminum shell.It is concluded that ideal detonation status of cloud and high power effect can be attained when the steel shell,specific central explosive about 3% and ratio of height to diameter between 3 and 5 are adopted and are well-matched of three device parameters above.