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Centrifugal fan: the effect of the tip clearance on the blade channel.

Ventilatore centrifugo. Effetto del gioco all'apice della pala.

Author(s) : OSNAGHI C., GAETANI P.

Type of article: Article

Summary

A detailed flow field investigation was performed in centrifugal fan model by means of LDV and pressure measurements. The purpose of this work is to understand the development and the evolution of the separated and secondary flows along the whole blade channel with detailed spanwise and pitchwise velocity profiles for different tip clearances. Different clearances cause, at channel rotor outlet, different jet and wake flows with different extension and intensity. In the clearance region a weak backflow is present. At the maximum tip clearance the wake is quite negligible and a spanwise non-uniform flow field is present: this is the main difference on the flow field caused by different tip clearance. Maps of secondary flows show the presence of strong vortices at rotor inlet and outlet due to the tangential component of the backflow. The wake generates strong secondary flows which depend on the radial position inside the rotor. A strong dependence of the slip factor from tip clearance width has also been shown.

Details

  • Original title: Ventilatore centrifugo. Effetto del gioco all'apice della pala.
  • Record ID : 2000-0929
  • Languages: Italian
  • Source: Termotecnica - vol. 52 - n. 5
  • Publication date: 1998/06
  • Document available for consultation in the library of the IIR headquarters only.

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