Abstract
The rapid expansion of moist air or steam in a supersonic nozzle gives rise to condensation, and the total pressure of the flow is reduced by this nonequilibrium phenomenon. In the present paper, a loss in total pressure due to condensation has been studied experimentally by pressure measurements in the case of moist air expanding in a supersonic circular nozzle, and the effects of the degree of supersaturation of moist air and the shape of the nozzle on the total pressure loss have been discussed. The length of the region where the total pressure decreases due to condensation is longer than that of the nonequilibrium condensation zone, and the difference in these two lengths increases with the degree of supersaturation. Furthermore, the higher the expansion rate of the nozzle is, and the larger the degree of supersaturation and the total temperature at the reservoir are, the larger the total pressure loss of flow is. These values are about 3 to 8 percent in the present experiment.
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