2351 遷音速流中の対称円弧翼周りの流れに及ぼす非平衡凝縮の影響(S46-5 圧縮性流れの基礎と応用(混相流),S46 圧縮性流れの基礎と応用)  [in Japanese] 2351 Effect on Non-Equilibrium Condensation of Moist Air on the Flow Field around a Circular Arc Blade  [in Japanese]

The unsteady phenomenon in the transonic flow around airfoils is observed in the flow fields of fan, compressor blades and butterfly valves, and this causes often serious such problems as the aeroacoustic noise and the vibration. In the transonic or supersonic flow where vapour is contained in the main flow, the rapid expansion of the flow may induce a non-equilibrium condensation. However, the effect of non-equilibrium condensation on the transonic internal flows around the airfoil has not yet been clarified satisfactorily. In the present study, the effect of non-equilibrium condensation of moist air on the self-excited shock wave oscillation on a circular arc blade was investigated numerically. The results showed that in the case with non-equilibrium condensation, the frequency of the flow oscillation became smaller than that without the non-equilibrium condensation.