不同海拔高度下破片速度衰减模型的修正方法

A Correction Method for the Velocity Attenuation Model of Fragments Based on Altitudes

采用流体力学软件FLUENT研究了不同初始速度(≤2500 m·s^(-1))和海拔高度(≤20 km)下破片阻力系数,对不同海拔高度下破片速度衰减模型进行修正,并开展相应的低气压破片速度衰减特性试验,验证了修正模型的准确性。结果表明:初速700 m·s^(-1)的球型破片和初速1000 m·s^(-1)的长方体破片使用修正后速度衰减模型计算结果与试验结果吻合度较高,误差均小于5%,且修正后的速度衰减模型计算精度比修正前的模型提高了10%左右。该修正后的破片速度衰减模型可用于计算阻力系数随海拔高度变化对破片速度衰减系数的影响,提高破片速度的计算精度,从而进一步提升破片战斗部威力评估的准确性。

The hydrodynamic software FLUENT was used to study the drag coefficient of fragments with different initial velocities(≤2500 m·s^(-1))and altitudes(≤20 km),and the velocity attenuation model of fragments with different altitudes was corrected Then the accuracy of the corrected model was verified by the corresponding velocity attenuation characteristic tests with low atmospheric pressures.The results show that the calculated results of spherical fragments with an initial velocity of 700 m·s^(-1) and cuboid fragments with an initial velocity of 1000 m·s^(-1) using the corrected velocity attenuation model are in good agreement with the experimental results that the errors are less than 5%,and the calculation accuracy of the modified velocity attenuation model is about 10%higher than that of the original model.The corrected velocity attenuation model of fragments can be used to calculate the influence of the drag coefficient,which is varied with the altitude,on the velocity attenuation coefficient of fragments,to improve the calculation accuracy of the fragment velocity,and to further improve the accuracy of the power evaluation of the fragment warhead.