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performance improvement OF centrifugal fan BY MEANS OF numerical simulation

Chinese Journal of Mechanical Engineering 2006年第1期19卷 55-58页

作者： ZHANG Bo HUANG Shujuan SUN Zhongwei HUI Shien LIU Jiayu QI Chunsong Institute of Energy and Power Engineering Xi＇ an Jiaotong University Xi＇ an 710049 China Thermal Power Research Institute State Power Corporation of China Xi＇ an 710032 China

numerical simulation is used to investigate the flow field in a model centrifugal fan for steam power stations in order to improve the performance. During testing the model fan, it is found that the efficiency is only 62.5% with inlet box, without it the efficiency is 83%. In addition, the strong vibration of test rig is observed with inlet box. It would be highly desirable if the aerodynamics of the fan could be studied. Therefore, numerical simulation is carried out to investigate the internal flow characteristics of a model fan with inlet box. The results from CFD analysis show that the whole region of the inlet box is occupied by a spiral vortex rotating inversely as the rotor＇s direction, which significantly affect the most flow＇region inside the fan. For this reason, a dummy plate is arranged in the inlet box to impede the generation of the spiral vortex, the results from CFD after the reform demonstrate that the modification is quiet effective, the former large spiral vertex has been destroyed effectively, the large one is superseded in favor of two small vortexes. However, two small vortexes have little effect on the inner flow of the rotor and the following parts. Finally, the efficiency of the model fan is improved by the test and the strong vibration of the test rig disappears. This type of modification has been used in steam power stations, the fan efficiency raises to 84% successfully.

关键词： numerical simulation centrifugal fan vortex performance improvement

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