Bionic Volute Tongue Optimization Design of Multi-blade Centrifugal Fan Inspired by the Wave Leading-edge of Humpback Whale Flippers  

作　　者：Yang Liu Qi Yuan Ziqian Xu Liming Wu Xiaomin Liu 

机构地区：[1]School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an,710049,China [2]Guangdong Midea Air-Conditioning Equipment Co.,Ltd.,Foshan,528311,China [3]Department of Electromechanical and Vehicle Engineering,Taiyuan University,Taiyuan,030032,China

出　　处：《Journal of Bionic Engineering》2023年第5期2209-2227,共19页仿生工程学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(11872289);“Aviation Engines and Gas Turbines”National Science and Technology Major Project Funding(J2019-IV-005-0072).

摘　　要：The volute tongue can split the gas in the multi-blade centrifugal fan to make the gas flow to the volute outlet as much as possible.However,the unsteady axial deflection of the gas in the impeller results in different air flow angles at the outlet of the impeller at different blade heights.This seriously affects the flow near the volute tongue.The wave leading-edge structure of humpback whale flippers has a very high flow control effect under complex flow conditions.Therefore,the wave leading-edge structure is studied in this paper and applied to the optimization design of multi-blade centrifugal fan volute tongue.First,based on the wave leading-edge structure of humpback whale flippers,three-dimensional wave leading-edge airfoils with different wave direction angles are established to judge the adaptability of the new wave leading-edge structure under different attack angles.Then,aiming at the internal flow field and noise characteristics of multi-blade centrifugal fan,a bionic volute tongue optimization design method is proposed,and studied its influence on the internal flow field and noise characteristics of the fan.The results show that when the wave direction angle is 45°,the wave leading-edge structure can effectively suppress the generation of the leading-edge separation vortex and the shedding of the wake vortex,which is also helpful to reduce the noise.The bionic volute tongue with the wave leading-edge structure can adapt to the situation that the impeller outlet air flow angle is small.At the maximum volume flow rate operating point,the static pressure recovery coefficient of the bionic volute tongue fan is increased by about 5%compared to the original fan,the air volume is increased by 5.16%,and the noise is reduced by 0.6 dB.

关 键 词：Multi-blade centrifugal fan AIRFOIL Volute tongue Biomimetic design Aerodynamic noise 

分 类 号：TH31[机械工程—机械制造及自动化]