周水清,王曼,李哲宇,张生昌.多翼离心风机蜗壳改型设计与性能试验[J].农业机械学报,2018,49(10):180-186,249.
ZHOU Shuiqing,WANG Man,LI Zheyu,ZHANG Shengchang.Influence of Volute Retrofit Design on Performance of Multi-blade Centrifugal Fan[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(10):180-186,249.
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多翼离心风机蜗壳改型设计与性能试验   [下载全文]
Influence of Volute Retrofit Design on Performance of Multi-blade Centrifugal Fan   [Download Pdf][in English]
投稿时间:2018-04-13  
DOI:10.6041/j.issn.1000-1298.2018.10.020
中文关键词:  多翼离心风机  蜗壳型线  降噪  模型修正  优化
基金项目:国家自然科学基金项目(51706203)
作者单位
周水清 浙江工业大学 
王曼 浙江工业大学 
李哲宇 浙江工业大学 
张生昌 浙江工业大学 
中文摘要: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25Pa,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2.5dB。
ZHOU Shuiqing  WANG Man  LI Zheyu  ZHANG Shengchang
Zhejiang University of Technology,Zhejiang University of Technology,Zhejiang University of Technology and Zhejiang University of Technology
Key Words:multi-blade centrifugal fan  volute profile  noise reduction  model correction  optimization
Abstract: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 k-εcalculation 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 k-εmodel 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 25Pa, 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 2.5dB.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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