仿生叶片对多翼离心风机噪声影响的数值研究
首发时间:2014-07-21
摘要:本文首先采用CFD方法数值预测了标准NACA0012翼型和仿生翼型的远场噪声,通过两种翼型噪声预测结果的对比,明确了仿生翼型的降噪效果,翼型声场的数值分析也确定了翼型远场噪声的主要构成;其次,本文尝试将这两种翼型运用于多翼离心风机中,对风机整体气动性能及噪声进行了数值模拟,并通过对带有NACA0012翼型的多翼离心风机性能和噪声的实验测量验证了本文数值计算方法的有效性;最后根据数值计算结果阐述了多翼离心风机中仿生翼型的节能降噪机理。研究结果表明:仿生翼型能够在不改变风机气动性能的情况下,有效降低风机气动噪声。同时,噪声频谱分析也表明仿生叶片的采用能有效降低多翼离心风机的旋转噪声和涡流噪声。
关键词: 流体机械 叶片翼型 仿生设计 多翼离心风机 噪声 数值模拟
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Numerical Study of the Effects of Bionic Blade on the Aerodynamic Noise of Multi-Blade Centrifugal Fan
Abstract:The far field noise of a standard NACA0012 airfoil and a bionic airfoil based on the owl wing is predicted respectively by using computaional fluid dynamics technique. Through comparing the far field acoustic sources, the noise-reduction characteristics of the bionic blade is confirmed and the constitutions of the acoustic sources of the airfoil are revealed. And then, the two types of blade are introduced into a multi-blade centrifugal fan. The overall performances of the multi-blade centrifugal fan with the NACA0012 airfoil blade and the bionic blade are simulated. For the multi-blade centrifugal fan with NACA0012 airfoil blade, the aerodynamic performance and noise are measured to validate the the numeircal results. Finally, the mechanism of the noise reduction of the bionic blade is analyzed. The studied results show that the aerodynamic noise of the multi-blade centrifugal fan is effectively reduced but without influencing the aerodynamic performance when the bionic blade is adopted. Compared with the NACA0012 airfoil blade, the bionic blade can suppress the rotation noise and vortex noise of the multi-blade centrifugal fan.
Keywords: Fluid machinery Blade airfoil Bionic design Multi-blade centrifugal fan Noise Numerical simulation
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No.4604251990973140****
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