نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری،دانشگاه تربیت مدرس، تهران، ایران
2 استاد،دانشگاه تربیت مدرس، تهران، ایران
3 دانشیار ، دانشگاه تربیت مدرس، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The non-equilibrium condensation of water vapor in transonic flows significantly affects the performance of nozzles and aerospace equipment. Under humid conditions, this phenomenon must be considered in the design and flow analysis process. In this study, the effect of relative humidity on transonic nozzle flow was investigated using numerical modeling and simulation of nonequilibrium water vapor condensation. The governing equations, incorporating nucleation and droplet growth processes, were solved using user-defined functions in a compressible numerical solver. The results showed that the water vapor caused significant changes in Mach number, pressure, and temperature. In the presence of water vapor, the dry air model overestimates the Mach number by 16% compared to the wet air model while underestimating the outlet pressure and temperature by 43.3% and 52%, respectively. Increasing relative humidity enhances the intensity of the condensation shock, with nucleation rates reaching their maximum at humidity levels above 80%. Additionally, at relative humidity levels above 60%, the number of condensed droplets increases sharply. Based on these findings, nonequilibrium condensation of water vapor must be considered in the design of transonic nozzles and compressors operating in humid conditions to prevent performance prediction errors.
کلیدواژهها [English]
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