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在汽液质量传输方程的基础上,考虑局部汽/液相含量、局部压力与饱和蒸汽压之差及空化的热力学效应,提出了一种可应用于高温水空化流计算的空化模型。为了评价该模型的适用性,以NACA66(MOD)翼型为对象,采用局部均匀平衡流方法分别计算了水温为293 K和373 K时的物面负压系数,并与实验和Singhal的全空化模型的计算结果进行了比较。研究表明:在水温为293 K时,改进的空化模型与全空化模型的计算结果均与试验吻合较好;在水温为373 K时,虽然两种空化模型的结果均显示空化的发展受到了抑制,但该文提出的空化模型能明显地反映出翼型表面空泡区的温度变化(即热力学效应)。该文提出的空化模型更适合模拟高温水的空化流。
Based on the vapor-liquid mass transfer equation and considering the difference of local vapor / liquid, partial pressure and saturated vapor pressure and the thermodynamic effect of cavitation, a cavitation model that can be applied to calculate cavitation flow at high temperature . In order to evaluate the applicability of this model, the NACA66 (MOD) airfoil was used as a target. The negative pressure coefficients of the surface of the NACA66 (MOD) airfoil at 293 K and 373 K were calculated by local uniform equilibrium flow method. The calculation results of the model are compared. The results show that at the water temperature of 293 K, the calculated results of the improved cavitation model and the full cavitation model all agree well with the experimental results. When the water temperature is 373 K, the results of both cavitation models show that cavitation However, the proposed cavitation model can obviously reflect the temperature change (ie, thermodynamic effect) on the surface of the airfoil. The proposed cavitation model is more suitable for simulating the cavitation flow of hot water.