基于修正的RNGκ-ε模型的水翼空化数值模拟  

A Modified RNG k—ε Model of the Numerical Simulation on an Airfoil

作　　者：唐学林[1] 贾玉霞[1] 王福军[1] 吴玉林[2] 李小芹[1] 

机构地区：[1]中国农业大学,水利与土木工程学院,北京100083 [2]清华大学,水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《工程热物理学报》2012年第9期1514-1518,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50976124;No 51179192;No.51139007);新世纪优秀人才支持计划(No.NETC-10-0784)

摘　　要：基于全空化模型，提出了修正RNGk-ε模型，并对NACA0015水翼的非定常空化流场进行了数值研究。基于标准RNGk-ε模型和修正的RNGk-ε模型，在8。和20。两种冲角及Re=3×10^5的条件下，针对不同空化数，分别预测了翼型周围的速度场、翼型表面的空穴形态以及非定常空化时空泡的演化过程。和试验结果对比，两个湍流模型都能较好地捕捉翼型周围的大空泡团，其中，标准的RNGk-ε模型能较好捕捉翼型头部的空穴，修正的RNGk-ε湍流模型能更好地模拟翼型表面的空穴形态、空泡脱落过程及其产生的回流。Based on the full cavitation model, a modified RNG k-ε model is proposed to simulate the unsteady cavitating flow around NACA0015 airfoil. At attack angles of 8° and 20° with different cavitation numbers and Reynolds number of Re=3×10^5, the standard RNG k-ε and modified RNG k-ε are used to predict velocity vectors, vortex of cloud cavity as well as evolution process of time-dependent cavity shape respectively. Compared with experimental data, these two models can capture big bubbles around airfoil, while standard RNG k-ε model can more accurately capture the shape of cavity on the suction face of airfoil, and the modified RNG k-ε model can better simulate the coherent structure of cavity, the collapse of the big bubbles and the re-entrant flow.

关 键 词：修正湍流模型 空化模型 空穴形态 翼型 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程]