Experimental research on supersonic non-equilibrium condensation on cold wall for liquified-air propulsion

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As for the supersonic condensation on the cold wall related to the research of liquified air cycle engine (LACE), this study has been tried to clarify experimentally the non-equilibrium supersonic condensation on cryogenic wall by an original diaphragmless shock tube. A new driver section was developed, and together with the first version driver shock tube results, non-equilibrium condensation on cold wall cooled by liquid nitrogen has been investigated. Condensing liquid film thickness was measured by laser interferometric method behind the incident and reflected shock waves in ethanol vapor of room temperature and in R-134a in cold temperature range. Also the heat flux measurement by Pt thin film on glass wall was measured. The both results were compared and discussed. Simultaneously the flow visualization clarified the instability of the surface of condensing liquid film on cold wall. These results indicated the direction of the cryogenic supersonic condensation research on LACE.