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Study on mechanism of prompt performance increase of backward centrifugal fan.

Author(s) : LEE Y. C., JENG M. S., CHEN L., et al.

Summary

The performance curve of a backward centrifugal fan with a 630 mm rotor showed that when air flow increased over 354 m3/min, the performance of the fan became jiggle and resulted in the prompt increase of static pressure, efficiency and energy consumption. In the study, the numerical model of the backward centrifugal fan was constructed to simulate the detail flow filed in the gap between rotor and bell mouth. The results indicated an original clockwise airflow through the gap. As the air flow increased up to the 354 m3/min, the flow became counterclockwise blowing out the gap and prompt increase of fan performance occurred due to the highly reverse pressure gradient created near the top side of the volute. Therefore, the sharp attack angle of flow from fan shroud to blade was adjusted and flow separation was diminished. Because the flow resistance on the blades suddenly reduced, the performance curve of the backward centrifugal fan was increased. Finally, experimental observations were also conducted, which confirmed the proposed mechanism of prompt performance increase in backward centrifugal fans.

Details

  • Original title: Study on mechanism of prompt performance increase of backward centrifugal fan.
  • Record ID : 2007-1209
  • Languages: English
  • Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Publication date: 2006/05/21

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