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Prediction and control of trailing edge noise based on bionic airfoil 被引量:6

Prediction and control of trailing edge noise based on bionic airfoil
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摘要 As a promising means,the passive porosity technology is used for the trailing-edge noise reduction of a bionic airfoil.The detailed two-dimensional Large Eddy Simulation is achieved to gain a better understanding of the prediction and passive control of trailing-edge noise source with the non-porous and porous treatment,respectively.The flow fields around the bionic airfoil indicate that the leading-edge separation causes both the noise contributors,i.e.,the turbulent boundary layer and the vortex shedding.In addition,the effect of the porous trailing edge is substantiated in the distribution of the static pressure.The relevant noise also suggests a pronounced noise reduction potential in excess of 10 dB,but it has dependence on the flow resistivities.The two trailing-edge noise reduction mechanisms are characterized:(1)the suppression of the tonal vortex shedding noise;(2)the reduction of broadband turbulent boundary layer scattering noise.The findings may be used as reference in the design of silent aircraft.
出处 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第7期1462-1470,共9页 中国科学(技术科学英文版)
基金 supported by the National Natural Science Fundation of China(Major Project of International Cooperation)(Grant No.50920105504)
关键词 bionic airfoil POROSITY trailing-edge noise reduction vortex shedding turbulent boundary layer 噪声降低 被动控制 后缘 仿生 预测 紊流边界层 机翼 大涡模拟
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