作　　者： ; ; ; ; ;

机构地区： 南京理工大学

出　　处： 《南京理工大学学报》 2012年第2期314-319,共6页

摘　　要： 该文基于N-S方程及压力隐式分裂算法,考虑气液间相变,采用大涡模拟湍流模型和流体体积法研究了绕NACA0015水翼非定常云空化流动特性。分析了包括初始涡、回射涡、空泡分离及空泡再生的周期性脱落过程,计算了斯德鲁哈尔数St、无量纲空泡长度和不同空化数下的水动力系数,计算结果与实验结果吻合。Kunz模型和Sauer模型对空泡形态的模拟结果表明,两种空化模型都能很好地模拟非定常云空化流动。 Adopting the N-S equations,the pressure implicit split operator,the large eddg simulation turbulence model and the volume of fluid method,the characteristics of the unsteady cloud cavitation flow around the NACA0015 hydrofoil are researched in consideration of the gas-liquid phase transition.The periodic shedding process including the initial vortex,the re-entrant jet vortex,the cavity shedding and the cavity regeneration is analysed.The Strouhal number St,the dimensionless cavity length and the hydrodynamic coefficients of different cavitation numbers are calculated.The calculation agrees with the experimental results.The Kunz model and Sauer model are used to simulate the cavity shape.The results show that the two cavitation models can be well used for the cloud cavitation flow.

关 键 词： 空化 大涡模拟 流体体积法 水翼 非定常流动

领　　域： [理学] [理学]