基于大涡模拟和声类比方法的平板冲击射流噪声指向性数值研究（英文）  

Prediction of Noise Directivity of An Impinging Jet Using LES and Acoustic Analogy Method

作　　者：刘鑫 谢军龙 谢晴 王淼 Xin Liu;Jun-long Xie;Qing Xie;Miao Wang

机构地区：[1]School of Energy and Power Engineering, Huazhong University of Science & Technology

出　　处：《风机技术》2019年第3期48-52,I0007,共6页Chinese Journal of Turbomachinery

基　　金：The National Natural Science Foundation of China(No.51376077)

摘　　要：利用大涡模拟(LES)和FW-H声类比方法对平板冲击射流的噪声指向性分布规律进行了数值研究。首先,当冲击速度相同时,对不同冲击距离下的平板冲击射流的流场进行了分析。然后,对不同冲击距离和冲击速度下各个噪声监测点的总声压级进行了数值预测。最后,结合流场与声场的计算结果,分析了平板冲击射流的声源产生机理及噪声指向性分布规律。结果表明,平板冲击射流的主要噪声源包括平板表面压力脉动产生的偶极子源和湍流流体内部应力引起的四极子源,冲击距离对噪声指向性分布规律具有十分重要的影响。The predictions of noise directivity of an impinging jet on the flat plate are carried out using the large eddy simulation(LES)and the Ffowcs-Williams and Hawkings(FW-H)acoustic analogy.Firstly,flow field of the proposed model is simulated and analyzed with different impinging distances under a certain impinging velocity.Secondly,sound pressure level(SPL)of different noise monitoring points are calculated under a range of impinging distances and various impinging velocities.Finally,combined with numerical result of the flow field,noise directivity of the impinging jet is analyzed.It is indicated that main noise sources consist of the dipole source generated by pressure fluctuation on the plate surface and the quadrupole source generated by the turbulent jet.In addition,the impinging velocity and the impinging distance have a significant effect on the regularity of noise directivity.

关 键 词：冷却风扇 气动噪声 气动性能 牵引电机 列车安全运行 试验 三维数值模拟 空气动力噪声 

分 类 号：O422[理学—声学]