Modification and Validation of Cavitation Model with Considering Thermodynamic Effects

ZHANG Desheng, WAN Fulai, XU Bin, WANG Chaochao, SHI Weidong

Abstract

During the growth and breakup of cavitation, thermodynamic effects will influence cavitation on water at different temperatures and cryogenic fluid. Combined Antoine equation and considered the change of saturated vapor pressure caused by latent heat of vaporization and impact of turbulent energy turbulence kinetic energy on local vaporization pressure, three kinds of cavitation models (Zwart, Merkle and Singhal) were modified. The hydrofoil NACA0015 at different water temperatures was numerically simulated by using three cavitation models and modified models. The conclusion showed that the simulated result of modified Merkle model was more consistent with experimental data. The HORD hydrofoil at different liquid nitrogen temperatures was numerically simulated based on the modified Merkle model. The results compared with experimental data showed that temperature and corresponding saturated vapor pressure were decreased in the cavity, leading to cavitation intensity decreased, the cavity length shortened and local cavitation number was over far field cavitation number. The liquid nitrogen temperature at 83.06K compared with it at 77.64K was more sensitive to thermodynamics, the pressure drop was larger and the cavitation intensity was weaker. The results can provide a new correction method of cavitation model for studying cavitation of water and cryogenic fluids at different temperatures. In addition, the modified cavitation model was of great significance for studying the thermodynamic effects in the cavitation process and it can be applied to cryogenic cavitation in engineering problems.


Keywords: cavitation model, hydrofoil, numerical simulation, thermodynamic effects

 

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