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建立起了梯度飞片击靶的理论模型 ,对具有不同波阻抗分布特征的W Mo Ti体系梯度飞片的击靶过程进行了数值模拟计算 .结果表明 ,梯度飞片对靶产生的压缩是逐步进行的 ,靶板的自由面速度也是逐渐提高的 ,准等熵压缩过程的加载速率远低于传统冲击压缩 .为获得较好的准等熵压缩效果 ,梯度飞片的波阻抗分布应遵循随厚度变化的二次至三次幂函数关系 ,并且靶板厚度必须与梯度飞片的击靶速度等相匹配 .
The theoretical model of the target shooting with gradient flyer is established and the numerical simulation of the target shooting process of the W Mo Ti system flyer with different wave impedance distributions shows that the compression of the target by the gradient flyer is gradual , The free surface velocity of the target plate is also gradually increased, the loading rate of quasi-isentropic compression process is much lower than the traditional impact compression.In order to obtain the better quasi-isentropic compression effect, the wave impedance distribution of the gradient flyer should follow the Thickness variation of the power function of the second to the third, and the thickness of the target must be with the gradient flying speed of the film to match the match.