【摘要】 为了研究微型激波管内部的不稳定流动和激波运动特性,采用数值模拟的方法对微型激波管内部流动进行分析。对比分析不同隔膜压力比(高压腔与低压腔的初始压力之比)和激波管直径对微型激波管内激波、交接面以及流体运动特性的影响,并与实验数据进行比较。结果表明:随着隔膜压力比的增大,激波和交接面的运动速度逐渐增大;激波在微型激波管内运动时,其强度逐渐减弱;在低压被驱动腔内压强较低时,观察到厚度较大的边界层,这说明低压影响对微型激波管内的激波和流体运动会产生一定的能量损失;激波前后的压力梯度随着激波运动逐渐减小;交接面在微型激波管内运动时,运动速度逐渐增大;参数S值可以反映微型激波管内的低压和小尺寸影响。更多还原

【Abstract】 Numerical simulation was applied to study internal flow of micro shock tube in order to study unsteady flow and shock wave motion characteristics in micro shock tube.Contrastive analysis was conducted for effects of different diaphragm pressure ratio(initial pressure ratio of high-pressure cavity and low-pressure cavity),and shock tube diameter on shock wave in micro shock tube,contact surface and fluid motion characteristics.Besides,experimental data were compared.The results show motion speed of shock wave and contact surface increases gradually with the increase in the diaphragm pressure ratio;when shock wave moves in micro shock tube,shock wave strength gradually weakens;a thick boundary layer is observed when pressure intensity in low-pressure driven cavity,which indicates that low pressure effect makes shock wave and flow more energy lose;pressure gradient in the front of and after shock wave gradually decreases as shock wave motion decreases gradually;the motion speed gradually increases when the contact surface moves in micro shock tube;in addition,Svalue can indicate effects of low pressure and small scale in micro shock tube.更多还原