The Optimum Design of Volute Housing for a Centrifugal Fan

• Main Authors: Wei-ChengTseng, 曾偉誠
• Other Authors: Cheng-Hung Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/29942722285823633654

碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 100 === This thesis utilize the technique of the Levenberg-Marquardt Method (LMM) together with the commercial package CFD-ACE+ for an optimal design of volute housing of a centrifugal fan. Design radius is set to the design parameters and the maximum airflow rate is set to the objective function. Then, we calculated by iteratively to obtain the optimum design of volute housing for a centrifugal fan. According to the above method, we can get the optimum geometry of a centrifugal fan with maximum airflow rate. The results show that the different design radius will result in different flow field situations with the changes in the appearance of the volute housing. By the flow patterns, we can see the phenomenon of pressure concentration improve significantly in volute housing, and the velocity distribution is more uniform in optimized fan. Optimized fan not only improves the phenomenon of reflow in outlet channel but also improves the phenomenon of vortex at tongue, and thus make the pressure difference smaller between blades. Experimental results show that the airflow rate increased to 6.46%. Also, because of the flow is more stable and reduced pressure concentration we have 5.32% noise reduction in optimized fan. Therefore, the optimum design of volute housing for a centrifugal fan achieve the goal of this thesis.