激波驱动颗粒群加速效果优化的实验研究

Experimental Investigation on Optimizing the Effect of Particle’s Acceleration Driven by Shock Waves

为了通过波后气流的加速来实现颗粒群加速效果的优化,该研究基于现有的水平激波管装置,设计加工了分别针对亚声速、跨声速和超声速波后气流的三种不同类型加速喷嘴。使用高速摄影仪对固体颗粒群的运动图像进行捕捉,通过沿激波管轴向动态压力测量确定激波速度和激波马赫数Ma。结果表明:其他条件都相同时,颗粒粒径越小,颗粒群运动的尾迹现象越不明显,颗粒群的加速效果越好;对于不同类型的喷嘴结构,其他条件都相同时,应该根据波后气流的马赫数合理的选取喷嘴来进行加速,从而优化颗粒群的加速效果。

This research designs three different types of accelerating nozzles and machines these nozzles behind the horizontal shock tube. The aim behind the concept is to accelerate subsonic, transonic and su- personic flow respectively so that they can optimize the effect of particles＇ acceleration. Thus, this research uses high-speed photography to capture the image of solid particles group moving in tube. Meanwhile, it utilizes dynamic pressure measurement to measure and calculate experimental shock wave velocity and Mach number along the axial position. Based on the experimental results, this thesis gives the conclusion. Under the same condition, the smaller the particle＇s diameter is, the more unobvious the wake phenome- non of particles group movement will be. For different types of nozzle structures, it is necessary to choose appropriate nozzles according to the Mach number of the gas flow in order that they can optimize the effect of particles＇ acceleration.