Abstract
The single supersonic free jet discharging from a nozzle or an orifice has been often employed in various industrial processes. A number of studies have been done to detail the major features (Mach disk, barrel shock wave and the jet boundary configuration) of the supersonic jets. In the present study, the numerical computations were performed to investigate the effect of initial degree of supersaturation of moist air at reservoir condition on under-expanded jet structures and the total pressure loss behind the Mach disk. As a result, it was found that the position of Mach disk in the under-expanded moist air jets was almost the same as that in dry air jets. However, the Mach disk diameter increased slightly as the initial degree of supersaturation of moist air increased. Furthermore, the total pressure loss behind the Mach disk for moist air jet changed largely in comparison to that for dry air jet.
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