基于不同空化模型NACA66水翼三维空化特性数值研究  

Numerical investigation of three-dimensional cavitating performance of NACA66 hydrofoil base on different cavitation models

作　　者：郑小波[1] 刘莉莉 郭鹏程[1] 洪锋 ZHENG Xiao-bo;LIU Li-li;GUO Peng-cheng;HONG Feng(Institute of Water Resources and Hydro-Electric Engineering, Xi＇an University of Technology, Xi＇an 710048, China;College of Mechanical and Power Engineering, China Three Gorges University, Yichang, 443002)

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]三峡大学机械与动力学院,湖北宜昌443002

出　　处：《水动力学研究与进展（A辑）》2018年第2期199-206,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51479166);陕西省重点研发计划(2017ZDXM-GY-081);陕西省教育厅服务地方专项计划(17JF019)~~

摘　　要：为了比较Zwart-Gerber-Belamri(ZGB)空化模型、Schnerr-Sauer(S-S)空化模型和改进后的Schnerr-Sauer(S-S)空化模型对水翼空化流动数值计算的影响,该文以攻角为6°的NACA66型三维水翼为研究对象,基于密度修正(DCM)的SST k-ω湍流模型,采用湍动能修正后的空化模型并对其非定常空化流场进行数值计算。获得了不同空化模型计算得到的翼型升阻力系数、吸力面空泡形态演变、速度场的分布规律以及翼型表面平均压力分布规律。结果表明,在非稳定空化状态下,ZGB和改进后的S-S均模拟出非定常空化的准周期性,而原始S-S预测非定常准周期性不明显。三种空化模型均捕捉到空化流场中的回射流结构,ZGB模型和改进后的S-S模型较原始S-S模型能捕捉到更强烈的云状空化,且空化向尾缘发展,随后向下游脱落,这与已有文献中的实验结果基本一致。For the purpose of comparing the capability for different cavitation models, unsteady and turbulent cavitating flows over the three-dimensional NACA66 hydrofoil with fixed angle of attack of α=6° were numerically investigated based on three models, i.e. the Zwart-Gerber-Belamri（ZGB） model, Schnner-Sauer（S-S） model and improved Schnerr-Sauer model, respectively. The SST k-ω model with local density correction was applied for the turbulence modeling and the effect of turbulence fluctuation was considered for the evaporation pressure as well. Hydrodynamic coefficients, time-evolution of cloud cavity and the velocity distribution and the average pressure distribution along hydrofoil surface based on different cavitation models were obtained from simulations. The results show that, in the stage of unsteady cavitation, both ZGB and improved S-S have simulated quasi-periodicity of unsteady cavitation, while the unsteady quasi-periodicity is not obvious in the original S-S predicted. All kinds of cavitation models can capture the effect of cavitation re-entrant jet. The ZGB model and improved S-S model can capture more accurate and intensive cloud shear cavitation than the S-S model, and the cavitation develops toward the trailing edge, then falls downstream, which are in consistent with the experimental results.

关 键 词：云状空化 NACA66水翼 空化模型 回射流 数值计算 

分 类 号：O359[理学—流体力学] TK730[理学—力学]