A study on generating quasi-isentropic compression via graded impedance flyer
为实现准等熵压缩的波阻抗梯度飞片的实验研究

Quasi isentropic compression techniques via graded impedance flyers allow investigations of material properties in a high pressure, low temperature regime which is inaccessible by conventional shock wave experiments. In the present study, quasi isentropic experiments were performed on a two stage light gas gun by using W Mo Ti system graded impedance flyers. The histories of the free surface velocity in targets were measured by VISAR. Effects of impedance distributions of the flyers on wave profiles were discussed mainly. It is found that the wave profiles with a smoothly rising front were created and the maximum pressure peak reached 167GPa. The flyer with parabolic distribution of impedance can produce a better compressive wave profile.