激波管中获得低强度激波的方法

The methods of obtaining lower strength shock wave in shock tube

文中探讨了在相对高的驱动压比条件下获得低强度入射激波的变截面驱动方法(A4/A1<1)和等截面激波管中插入多孔板的方法。经实验比较等截面激波管获得的压力波形好,但过低驱动压比时膜片选择困难、实验重复性差。介绍的两种方法可以获得更低强度入射激波,但压力波形稍差,有进一步改善的空间。

Two methods of obtaining lower strength shockwave in shock tube were explored： （1） the area change of drive section and driven section （A4 〈 A1 ） . （2） adding orifice plates downstream of the diaphragm in shock tube. Comparing the two methods, the pressure curves of the region ② and ⑤ in constant-area shock tube were excellent. But repeatability of experiment in the case of lower strength shock wave was not satisfying. The two methods had obtained lower strength shock wave easily, but pressure curves of the region ⑤ were not so good.