直流グロー放電場との干渉による衝撃波湾曲効果

抄録

Shock wave curvature effect due to the interaction between the DC glow discharged field and the shock wave was investigated by the experiment and the numerical analysis. From the experiment, in the case without the discharged filed, the normal shock wave propagation was observed. On the other hand, in the case with the discharge, the shock wave curvature was observed. From the numerical analysis by using the temperature modulated field model which models the discharged filed, the similar results from the experiment can be observed. In the numerical analysis, in the case with the temperature modulated field with the maximum temperature of 1000 K, the flow field behind the shock wave was investigated, at the timing after the shock wave passing through the maximum temperature position of x=0.025 m corresponding to the timing after passing through the electrode center in the experiment (t = 42.3 μsec, the relative time elapsed from the shock wave passing through x=0 m), for the initial shock wave Mach number of 2. The pressure in the region behind the shock wave was 32 % lower compared to the case without that field, and also the y-direction velocity induced by the baroclinic effect was 94 m/sec at the maximum value in the region just behind the shock wave. This y-direction velocity (94 m/sec) caused to incline the shock wave about 15 degrees from the normal shock wave. From this study, it was suggested that the vortex field mainly due to the baroclinic effect plays an important role for the shock wave curvature effect.