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Passive control of condensation shock wave in supersonic nozzles
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 Title & Authors
Passive control of condensation shock wave in supersonic nozzles
Kim, Hui-Dong; Gwon, Sun-Beom; Setoguchi, Toshiaki;
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When a moist air is rapidly expanded in a supersonic nozzle, nonequilibrium condensation occurs at a supersaturation state. Condensation shock wave appears in the nozzle flow if the releasing latent heat due to condensation goes beyond a critical value. It has been known that self-excited oscillations of the condensation shock wave generate in an air or a steam nozzle flow with a large humidity. In the present study, the passive control technique using porous wall with a cavity underneath was applied to the condensation shock wave. The effects of the passive control on the steady and self-excited condensation shock waves were experimentally investigated by Schlieren visualization and static pressure measurements. The result shows that the present passive control is a useful technique to suppress the self-excited oscillations of condensation shock wave.
Compressible Flow;Condensation Shock Wave;Supersonic Nozzle;Self-Excited Oscillation;Supsersonic Wind Tunnel;Normal Shock Wave;Passive Control;Porous Wall;
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