平直水翼梢隙流动的直接数值模拟研究  

Direct Numerical Simulation Study of the Tip-Leakage Flow in a Flat Hydrofoil

作　　者：尚文强 李栋 罗坤[1] 樊建人[1] SHANG Wen-Qiang;LI Dong;LUO Kun;FAN Jian-Ren(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Department of Mechanics,School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027 [2]北京理工大学宇航学院力学系,北京100081

出　　处：《工程热物理学报》2021年第6期1466-1471,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.91852101,No.51776183)。

摘　　要：本文对真实湍流入口条件下的梢隙流动进行直接数值模拟研究,来流湍流边界层动量厚度雷诺数为800。水翼采用NACA0012水翼,水翼攻角为8°,选取经水翼弦长无量纲化后的梢隙宽度为0.0167和0.0333。研究发现,梢泄涡仅在较大梢隙宽度条件下的水翼吸力面才出现,而当梢隙宽度较小时在水翼吸力面侧近端壁处形成回流区。吸力面侧回流涡沿流向存活时间较短,而梢泄涡沿流向发展直至水翼尾缘及其下游。在上述两工况间存在着一临界梢隙宽度,使得梢隙流动由回流向梢隙射流转变。In this paper,under the real inflow turbulence with a Reynolds number of 800 based on the momentum thickness,direct numerical simulations of the tip-leakage flow were performed.A NACA0012 hydrofoil was adopted,with an incidence angle of 8°,and the tip-gap widths normalized by the chord of the hydrofoil were 0.0167 and 0.0333 respectively.It is found that the tip-leakage vortex can only be observed on the suction side of the hydrofoil at a wider tip-gap width,while a backflow zone is formed in proximity to the endwall on the suction side of the hydrofoil as the tip-gap size is small.The backflow vortex on the suction side has a shorter survival time along the streamwise direction,while the tip leakage vortex develops along the streamwise direction until the trailing edge of the hydrofoil and further downstream.In summary,there is a critical tip-gap width between the two tip-gap sizes,where the tip-leakage flow turns from backflow to tip-leakage jet within the tip-gap.

关 键 词：梢隙流动 湍流边界层 内嵌边界法 直接数值模拟 

分 类 号：O352[理学—流体力学]