摘要
通过运用LBM-LES方法,对基于仿生学原理构建的多孔仿生翼型进行了气动噪声声场的直接计算,并深入分析了多孔仿生翼型的流动特征和声学特性,详细探讨了多孔介质流阻和长度对仿生翼型控制效果的影响。结果表明:多孔介质长度为20%,流阻较高时,仿生翼型具有较好的降噪效果;当流阻比较低的时候,仿生翼型尾涡会变强,从翼型后缘脱落后形成有序的卡门涡街,会增强仿生翼型的气动噪声,失去降噪效果;翼型壁面附近边界层内的相干结构及翼型后缘处脱落的尾涡是产生远场气动噪声的主要声源,仿生翼型的噪声控制需要综合考虑两处主要声源的影响,才可能有效起到降低气动噪声的目的。
By applying the LBM-LES method,the aerodynamic noise sound field is directly calculated for the porous bionic airfoil constructed based on the bionics principle,and the flow characteristics and acoustic properties of porous bionic airfoils are analyzed in depth,and the effects of flow resistance and length of porous media on the control effect of bionic airfoils are discussed in detail.It is revealed that the bionic airfoil has a better noise reduction effect when the length of the porous medium is 20%and the flow resistance is high.When the flow resistance keeps relatively low,the wake vortex of the bionic airfoil will become stronger,and an orderly Karman vortex street is formed after falling off from the trailing edge of the airfoil,which will enhance the aerodynamic noise of the bionic airfoil and lose the noise reduction effect.The coherent structure in the boundary layer near the airfoil wall and the wake vortex shedding at the airfoil trailing edge are the main sound sources of far-field aerodynamic noise.The noise control of the bionic airfoil needs to comprehensively consider the influence of the two main sound sources in order to effectively reduce the aerodynamic noise.
作者
刘勇
汤崇辉
钟伯文
李鑫
LIU Yong;TANG Chong-hui;ZHONG Bo-wen;LI Xin(School of Aircraft Engineering,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Key Laboratory for Aircraft Design and Aerodynamic Simulation,Nanchang 330063,China)
出处
《南昌航空大学学报（自然科学版）》
CAS
2022年第3期111-115,共5页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
国家自然科学基金(11962018,12262023)
航空科学基金(2018ZA56003)。
关键词
仿生翼型
数值模拟
噪声控制
多孔介质
bionics airfoil
numerical simulation
noise control
porous media
作者简介
通讯作者:钟伯文(1963-),男,博士,研究员。主要研究方向:飞行器设计、计算空气动力学。
