摘要
为了改善小型多翼离心风机出口存在的气流死角及大面积旋涡现象,在原风机结构基础上通过调整出风罩倾斜角对其进行改型设计,并结合数值模拟和实验测量的方法,研究出风罩改型设计对多翼离心风机性能的影响。结果表明:根据出口气流组织分布特点对出风罩倾斜角作相关调整,能够有效改善风机内部流体流动情况,减小旋涡强度及其影响区域,增大有效流通面积进而达到提高风机性能及优化噪声的效果。分析改型前后风机气动性能和噪声测试结果可知,改型风机出口静压提升约20 Pa,最大全压效率较原型机提升约4. 7%。同时,由于出风罩倾斜角度的增加减小了叶轮出流对风机出口左侧壁面的冲击,从而使风机气动噪声得到控制,各频段A计权声压级平均降低3. 5 d B。研究结果证明该出风罩结构改型设计方法不仅能提高风机性能,还能达到降低噪声的效果,具有一定工程应用价值。
In order to improve the airflow dead angle and large-area vortex phenomenon at the exit of the small multiblade centrifugal fan,the exhaust hood angle was adjusted on the basis of the original fan structure.And combined with numerical simulation and experimental measurement methods,the influence of the exhaust hood modification design on the performance of the multi-blade centrifugal fan was studied.The results show that according to the distribution characteristics of the outlet air distribution,the relative adjustment of the inclination angle of the exhaust hood can effectively improve the flowof the fluid inside the fan,reduce the vortex intensity and its influence area,and increase the effective circulation area to improve the performance of the fan and optimize the effect of the noise.Analysis of the aerodynamic performance and noise test results of the fan before and after the modification shows that the static pressure of the modified fan outlet is increased by about 20 Pa,and the maximum total pressure efficiency is about 4.7%higher than that of the prototype.At the same time,due to the increase of the inclination angle of the exhaust hood,the impact of the impeller outflow on the left wall surface of the fan outlet is reduced,so that the aerodynamic noise of the fan is controlled,and the sound pressure level of the A-weight is reduced by 3.5 dB on average.The research results show that the modified design method of the hood can not only improve the performance of the fan,but also achieve the effect of reducing noise,which has certain engineering application value.
作者
林圣全
丁云斌
李嘉渊
谢林君
LIIN Shengquan;DING Yunbin;LI Jiayuan;XIE Linjun(Zhejiang Youpon Integrated Ceiling Co.,Ltd.,Haiyan,Zhejiang 314300,China;Haiyan County Science and Technology Bureau,Haiyan,Zhejiang 314300,China;College of Mechanical Engineering,Zhejiang University of Technolog,Hangzhou 310014,China)
出处
《轻工机械》
CAS
2019年第1期88-93,共6页
Light Industry Machinery
