Experimental and numerical investigation on sound generation from airfoil-flow interaction

Abstract：Aerodynamic noise due to interaction between incoming turbulence and rotating blades is an important component in the wind turbine noise. The rod-airfoil configuration is used to investigate the interactive phenomenon experimentally and numerically. Distribution of unsteady pressure on the airfoil surface is measured for different rod positions and airfoil attack angles. Two National Advisory Committee for Aeronatics (NACA) airfoils, NACA0012 and NACA0018, and two wind turbine airfoils, S809 and S825 are investigated. In addition, for low angles of attack, the flow field around the airfoils leading edge is investigated with the particle image velocimetry (PIV). The experimental results indicate that unsteady pressure disturbances on the airfoil surface are related to the rod vortex shedding. Meanwhile, the interaction flow field of the rod and NACA0012 airfoil is simulated with the unsteady Reynolds averaged Navier-Stokes method (URANS), and the obtained pressure spectra are compared with the experimental results. 作者： Author： Min JIANG  Xiao-dong LI  Jia-jian ZHOU 作者單位： School of Jet Propulsion, Beihang University, Beijing 100191, P. R. China 期 刊： 應用數學和力學（英文版）   EISCI Journal： APPLIED MATHEMATICS AND MECHANICS 年，卷(期)： 2011, 32(6) 分類號： V211.7 V211.3 Keywords： rod-airfoil interaction    unsteady Reynolds averaged Navier-Stokes method    particle image velocimetry    unsteady pressure    機標分類號： O6 X51 機標關鍵詞： interaction    sound    particle image velocimetry    wind turbine    flow field    NACA0012    rotating blades    results    Navier-Stokes    rod    interactive    different    addition    spectra    related    Two    PIV 基金項目： the National Basic Research Program of China (973 Program)

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