Abstract
A 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 method is presented for calculating a loss in total pressure due to condensation generated by a rapid expansion of moist air in a supersonic circular nozzle. The loss in total pressure has been determined from the amount of increment in the entropy produced as the result of the irreversibility in the nonequilibrium condensation process. The calculated results of the loss in total pressure are a little smaller than those of the experimental results, and the values are about 2 to 5 percent in the present calculation. Based on the calculated results, the effects of the degree of supersaturation of moist air and the shape of nozzle on the total pressure loss have been made clearly in quantity.
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