In order to reduce the aerodynamic noise of the airfoil, acoustic analogy was used. the research object was the NACA0018 airfoil, and the effect of ridge structure on the far-field noise of airfoil was analyzed. To simulate the airfoil flow field with ridge structures, choosing the flow speed of 12 m/s and 24 m/s respectively and the attack angle 6°, and the corresponding Reynolds number based on chord length was about 1.6×105. The sound source extracted by large eddy simulation was calculated through the, so the acoustic field of Riblet-Q and Riblet-H airfoil were acquired. The calculation results of unsteady flow field show that: under the attack angle 6°, Riblet-H airfoil can improve the boundary layer separation of airfoil and suppress the shedding of vortex structures, so as to reduce the pressure pulsation on the airfoil surface and the sound pressure fluctuation at the receiving point. The ridge structures of adverse pressure gradient section can effectively reduce noise when the frequency within 0-3000 Hz. Further research shows that the noise in this state is mainly the vortex shedding noise caused by boundary layer. It is concluded that the ridge structure in the proper position can improve the noise condition of the airfoil.
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王松岭,李曙光,刘梅,等. 带脊状结构的NACA0018翼型气动噪声特性[J]. 科学技术与工程, 2019, 19(7): . Wang Songling, Li Shuguang, Liu Mei, et al. Noise Characteristics of Airfoil With Ridged Structure[J]. Science Technology and Engineering,2019,19(7).