温度对液氢绕水翼非定常空泡流影响的数值研究

Numerical investigation of temperature effect on unsteady cavitating flow of liquid hydrogen around hydrofoil

该文基于均质多相流理论,采用RNG k-模型和修正系数Zwart空化模型对液氢绕NACA0015水翼非定常空化流动进行数值模拟。模拟了非定常空泡云的生长、断裂、涡状空化团脱落和破裂的周期性过程,模拟中考虑了热力学效应,并分析了温度对空泡流场特性的影响。研究结果表明:在相同空化数和来流速度下,空泡周期随温度增高而变长,升、阻力系数的波动周期随温度增高而增加,但其时均值的随温度增高而减小。

Based on homogeneous multiphase model, unsteady cavity flow of liquid hydrogen around hydrofoil was simulated using RNG k-ε model and update coefficient Zwart cavitation model. Taking the thermodynamic effect into account, it is simulated the periodic process of unsteady cloud cavity growth, break, and eddy-like cavity shedding and break. The effect of temperature on the characteristic of cavitating flow field is also analyzed.. The results show that： at the same cavitation number and free stream velocity, the period of unsteady cavity and lift/drag coefficient fluctuation period increase with temperature increasing, while the time averaged lift/drag coefficient decrease with temperature increasing.