抄録
A rapid expansion of moist air or steam in a supersonic nozzle gives rise to non-equilibrium condensation. If the latent heat released by condensation exceeds a certain quantity, the flow becomes unstable and a periodic flow oscillation occurs. In the present study, a numerical simulation of moist air flows in a supersonic nozzle was carried out using a special short duration supersonic wind tunnel, called a Ludwieg tube. In cases of nozzles with large throat height, the effects of initial relative humidity of the moist air on the flow field have been shown numerically. As a result, it was found that the characteristics of flow with occurrence of condensation were grouped into three classes.
