铝-铝超高速撞击气化产物运动特性测量与分析

根据超高速撞击条件下气化产物的产生机理和辐射特性，设计了获取气化产物冲击波运动速度的序列成像测量方法，并在超高速碰撞靶上开展了直径4.5 mm铝球以6 km/s左右速度撞击2A12中厚铝板的试验，测量得到了撞击气化产物冲击波的运动序列图像，对撞击气化产物冲击波运动半径、速度、气化产物总能和波后流场参量分布等进行了定量分析，获得了铝-铝超高速撞击气化产物的运动特性。研究表明:设计的测量方法能很好地获得撞击气化产物冲击波不同时刻的位置信息，可为分析气化产物运动特性提供数据支持；测量所得气化产物冲击波运动半径随时间变化关系与Taylor点爆炸模型拟合结果相符，证明了该模型理论可用于超高速撞击气化产物运动特性相关研究。

Measurement and analysis of motion characteristics of vapor clouds induced by aluminum-aluminum hypervelocity impact

A sequenced imaging method for obtaining the velocity of the impact-induced vapor shock wave is designed according to the generating mechanisms and radiation characteristics of vapor clouds in hypervelocity impacts. Tests were conducted for 2A12 aluminum plates being impacted by aluminum spheres with a diameter of 4.5 mm and velocity of 6 km/s. Sequenced images of the movement of the impact-induced vapor shock wave were obtained. The expanding radius, the velocity of the vapor shock wave, the total energy of the vapor clouds and the distribution of parameters in the flow field behind the shock wave, etc., were quantitatively analyzed. It is revealed from the results that the location information of the impact vapor shock wave at different times can be obtained properly by the designed measurement method, providing data for analyzing the motion characteristics of the vapor cloud. The measured expansion of the vapor wave radius with time is consistent with fitting results of the Taylor model, proving that the Taylor model theory can be used for studies related to hypervelocity impact vaporization.