摘要
为了提高Schnerr-Sauer空化模型模拟空化流动的能力,基于Rayleigh-Plesset方程和均相流假设建立了一种考虑空泡半径随时间非线性变化的空化模型.联立滤波器湍流模型,分别采用该非线性空化模型和原始Schnerr-Sauer模型对绕二维Clark-Y翼型空化流进行了非定常数值计算,得到了时均化升阻力系数随空化数的变化曲线、云空化时空泡周期性演变及其沿弦长方向速度分布规律.与其他的实验结果进行对比分析,结果表明:采用该非线性模型计算得到的时均化升阻力系数与实验值符合程度更好,并能较准确地捕捉升阻力系数在不同空化阶段的变化规律;该非线性模型能准确地模拟翼型尾缘空化云的成长、脱落和溃灭的全过程,且能更准确地模拟翼型尾流的速度场.
Based on the Rayleigh-Plesset equation and equilibrium assumption,a new cavitation model considering the non-linear variation of bubble radius was proposed to enhance the capability of predicting cavitating flows for Schnerr-Sauer model.Unsteady and turbulent cavitating flows around a twodimensional Clark-Y hydrofoil were performed using the proposed model and original Schnerr-Sauer model,respectively,combined with the FBM turbulence model.The time-averaged lift and drag coefficients,cavity shape evolution and x-velocity profiles at cloud cavitation were obtained from prediction.Comparing with other experimental data,the time-averaged lift and drag coefficients predicted from proposed model agree better with experimental results than the original Schnerr-Sauer model and the proposed model can accurately predict the special characteristics of the time-averaged lift and drag coefficients during different cavitation numbers.Additionally,the proposed model is more capable to predict the growth,shedding and collapse of the cloud cavity near the trailing edge and the flow structure in the wake of cloud cavitation stage.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第10期15-20,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金重点资助项目(51239005)
江苏省普通高校研究生科研创新计划资助项目(KYLX-1040)
江苏省高校优势学科建设工程资助项目(PAPD)
关键词
空化流
水翼
空化模型
滤波器湍流模型
数值计算
cavitating flow
hydrofoil
cavitation model
Filter-based model
numerical simulation
