Effects of condensing moist air on shock induced oscillation around an airfoil in transonic internal flows

Shock induced oscillation around an airfoil in transonic internal flow fields are often observed due to complex shock wave boundary layer interaction. However, in actual flow where finite amount of water vapor is present in the air, the rapid expansion of the flow may give rise to non-equilibrium condensation. Effects of condensing moist air on unsteady shock induced oscillation were numerically studied for total back pressure to reservoir pressure ratios of 0.73–0.65. Results showed that in case with condensing moist air flows, the root mean square of shock induced pressure oscillation and the oscillation frequency were reduced significantly compared with those without the non-equilibrium condensation. However, there was an increase of total pressure loss for condensing moist air flows.

► We studied the effects of condensing moist air on shock induced oscillation around an airfoil.
► With condensing moist air flows, the RMS of pressure oscillation and the frequency were reduced compared to dry air case.
► However, an increase of total pressure loss was found for condensing moist air flows.