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Effect of Area Ratio on the Aerodynamic Performance of Parallel Wall Volute Casing of an Industrial Centrifugal Fan

[+] Author Affiliations
C. Hariharan, M. Govardhan

Indian Institute of Technology Madras, Chennai, TN, India

Paper No. IMECE2012-86099, pp. 303-310; 8 pages
doi:10.1115/IMECE2012-86099
From:
  • ASME 2012 International Mechanical Engineering Congress and Exposition
  • Volume 1: Advances in Aerospace Technology
  • Houston, Texas, USA, November 9–15, 2012
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4517-2
  • Copyright © 2012 by ASME

abstract

To design a compact centrifugal fan with parallel wall volute, the ratio between the impeller exit width (B2) and volute width (B5) is kept high. In the present study, a detailed numerical simulation of parallel wall volutes for backward curved centrifugal blower with different (B5/B2) ratios (4 and 5) is carried out. These simulations are done for varying mass flow rates. By increasing the ratio from 4 to 5, the material required by the volute can be reduced by 15%. The analysis of the flow field shows that an increase in the B5/B2 ratio causes a slight decrease in the pressure ratio and efficiency at higher mass flow rates. At the outlet of the impeller, higher ratio volute generates a more uniform flow distribution which reduces the structural load on the impeller.

Copyright © 2012 by ASME

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