摘要
以某型号离心风机为研究对象,保留相关结构细节特征,建立三维有限元模型。基于CFD(Computational Fluid Dynamics)软件采用雷诺时均法对其内部流场开展稳态计算,并采用声类比积分法对风机的气动噪声进行预测。通过气动性能以及辐射噪声的试验测试和仿真结果对比来验证仿真模型的有效性。由宽频噪声模型分析可知,离心风机噪声源位置主要集中于叶片以及蜗舌附近。考虑到工程用离心风机结构改型成本较高,对叶片进行穿孔二次设计,提出一种优化的穿孔方案,探讨叶片穿孔对离心风机气动性能以及噪声声压级的影响。研究结果表明,优化后的叶片穿孔设计可降低叶片表面的压力脉动进而减少离心风机气动噪声,所提出的设计方案可使风机噪声总声压级降低2.64 dB。
The 3D finite element model of a centrifugal fan is established with its relevant structural detail features retained.Based on CFD(Computational Fluid Dynamics)software,the steady-state calculation of its internal flow field is carried out using Reynolds time-averaged method,and the aerodynamic noise of the fan is predicted using the acoustic analog integration method.The validity of the simulation model is verified by comparing the experimental test data with simulation results of aerodynamic performance and radiated noise.From the analysis of the broadband noise model,it can be seen that the centrifugal fan noise source location is mainly concentrated in the blade and the worm tongue nearby.Considering the high cost of centrifugal fan structure modification,this paper proposes an optimized blade perforation scheme,and explores the impact of blade perforation on centrifugal fan aerodynamic performance and noise sound pressure level.The research results show that the optimized blade perforation design can reduce the pressure pulsation on the blade surface and thus reduce the centrifugal fan aerodynamic noise,and the proposed design scheme can reduce the total fan noise sound pressure level by 2.64 dB.
作者
林康
沈承
王斌
胥强荣
朱洋
马卿
LIN Kang;SHEN Cheng;WANG Bin;XU Qiangrong;ZHU Yang;MA Qing(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Nanjing Center for Multifunctional Lightweight Materials and Structures(MLMS),Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Suzhou DingYu Energy Saving Equipment Co.,Ltd.,Suzhou 215213,Jiangsu,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第6期24-30,37,共8页
Noise and Vibration Control
基金
南京航空航天大学研究生科研与实践创新基金资助项目(xcxjh20210106)
国家自然科学基金资助项目(12202183)。
关键词
声学
离心风机
气动噪声
叶片穿孔
FW-H方程
acoustics
centrifugal fan
aerodynamic noise
blade perforation
FW-H equation
