多翼离心风机蜗壳改型设计与性能试验  

Influence of Volute Retrofit Design on Performance of Multi-blade Centrifugal Fan

作　　者：周水清[1] 王曼 李哲宇 张生昌[1] ZHOU Shuiqing;WANG Man;LI Zheyu;ZHANG Shengchang(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310024,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310024

出　　处：《农业机械学报》2018年第10期180-186,249,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51706203)

摘　　要：为改善小型多翼离心风机受气体粘性影响导致流动分离加剧的现象,在传统蜗壳型线设计理论的基础上,研究气体粘性力矩对蜗壳壁线分布的影响,并采用动量矩修正方法对其进行改型设计。另外,为真实反映风机内流场分布情况,在标准k-ε计算模型的扩散项中加入粘性应力作用,使其最高计算误差降低至3%。对比分析改型前后风机数值模拟计算和试验测量结果可知,采用修正的k-ε模型进行计算发现改型后风机内旋涡强度减小,蜗壳出口靠近蜗舌处流动分离得到改善。试验结果表明:改型风机出口静压提升约25 Pa,最大全压效率较原型机提升约10%。同时,由于蜗壳张开度扩大能够抑制流动分离,使蜗舌附近区域的旋涡强度及其影响区域减小,从而使多翼离心风机噪声降低了2.5 d B。In order to improve the phenomenon of increased flow separation caused by the influence of gas viscosity on the small multi-blade centrifugal fan,the influence of gas viscous torque on volute wall distribution was studied based on the traditional volute design theory,and the momentum correction was used to modify the design.In addition,in order to truly reflect the distribution of the flow field in the fan,the viscous stress was added to the diffusion term of standard kεcalculation model to reduce the maximum calculation error to 3%.Comparing and analyzing the fan s numerical simulation and experimental results before and after modification,the modified kεmodel was used to calculate,and it was found that the vortex intensity in the modified fan was reduced,and the flow separation near the volute outlet at the volute outlet was improved.The experimental results showed that the static pressure at the outlet of the modified fan was increased by about 25 Pa,and the maximum full-pressure efficiency was improved by about 10%compared with the prototype.At the same time,due to the expansion of the volute expansion,flow separation can be suppressed,the vortex intensity in the vicinity of the volute tongue and its influence area were reduced,and the noise of the multi-blade centrifugal fan was effectively reduced by 2.5 dB.

关 键 词：多翼离心风机 蜗壳型线 降噪 模型修正 优化 

分 类 号：TH432[机械工程—机械制造及自动化]