轴向间距对单级风扇纯音噪声的影响  

Effect of axial spacing on tonal noise of a single-stage fan

作　　者：束王坚 陈聪聪 杜林[2] 孙晓峰[1,2] SHU Wangjian;CHEN Congcong;DU Lin;SUN Xiaofeng(School of Energy and Power Engineering,Beihang University,Beijing 102206,China;Research Institute of Aero-Engine,Beihang University,Beijing 102206,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京102206 [2]北京航空航天大学航空发动机研究院,北京102206

出　　处：《航空动力学报》2024年第9期460-468,共9页Journal of Aerospace Power

基　　金：国家自然科学基金(52022009);航空发动机及燃气轮机基础科学中心(P2022-A-Ⅱ-003-001)。

摘　　要：针对单级风扇纯音噪声的远场声辐射预测,介绍了一种混合计算方法。其中,非线性谐波(NLH)方法用于转静干涉载荷声源的计算,声类比方法用以获得自由场的辐射声场,机匣的散射作用通过边界积分方法(BIEM)加以考虑。该混合方法可以同时预测管道内的声传播和管道外的声辐射。采用NASA的Advanced Noise Control Fan(ANCF)项目中的单级风扇作为研究对象,研究了实验间距下转静交界面位置的影响,确定交界面位置取在转静间距0.5倍,此时和远场声辐射实验结果最为接近。随后研究转静轴向间距对纯音噪声的影响,随着间距的减小,静子表面非定常载荷幅值、远场噪声指向性声压级相应增加。在低频下噪声指向性形状保持一致,高频噪声的指向性形状和声压级变化明显。An integrated computational approach was introduced for prediction of single-stage fan tonal noise.The nonlinear harmonic(NLH)method was used for computation of acoustic sources,the incidence wave in the free field was based on acoustic analogy,and the scattering wave generated by boundaries was solved by boundary integral element method(BIEM).The sound propagation inside the duct and radiation outside the duct can be predicted simultaneously.Then,the present method was applied to tonal noise prediction of the Advanced Noise Control Fan(ANCF)developed by NASA Glenn Research Center.The effect of interface locations was investigated at first as the experimental settings.The results indicated that the interface location at 0.5 times the axial spacing was most suitable for the computation of rotor-stator interaction,which was closest to the experimental results of tonal noise.Then,the effect of axial spacing on tonal noise was calculated.With the decrease of axial spacing,harmonic loading on the stator vanes and sound radiation in the far field showed an increasing trend.The shape of noise directivity at the first blade passing frequency(BPF)was similar,and the noise directivity at the second BPF showed big difference in shape and amplitude.

关 键 词：转静干涉 交界面 轴向间距 非线性谐波(NLH)方法 边界积分方法(BIEM) 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]