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Comparison of Dynamic and Aerodynamic Characteristics of the Centrifugal Fan Calculated by Different Methods

[+] Author Affiliations
Roman Gášpár, Jiří Polanský

University of West Bohemia, Pilsen, Czech Republic

László Kalmár

University of Miskolc, Miskolc, Hungary

Paper No. IMECE2013-64196, pp. V07BT08A051; 5 pages
doi:10.1115/IMECE2013-64196
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 7B: Fluids Engineering Systems and Technologies
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5632-1
  • Copyright © 2013 by ASME

abstract

The main aim of this paper is determine the centrifugal fan with forward curved blades aerodynamic characteristics based on numerical modeling. Three variants of geometry were investigated. The first, basic “A” variant contains 12 blades. The geometry of second “B” variant contains 12 blades and 12 semi-blades with optimal length [1]. The third, control variant “C” contains 24 blades without semi-blades. Numerical calculations were performed by CFD Ansys and OpenFoam.

Another aim of this paper is to compare results of the numerical simulation with results of approximate numerical procedure. Applied approximate numerical procedure [2] is designated for to determine characteristics of the turbulent flow in the bladed space of a centrifugal-flow fan impeller. This numerical method is an extension of the hydro-dynamical cascade theory for incompressible and inviscid fluid flow. Paper also partially compares results from the numerical simulation and results from the experimental investigation. Acoustic phenomena observed during experiment, during numerical simulation manifested as deterioration of the calculation stability, residuals oscillation and thus also as a flow field oscillation. Pressure pulsations are evaluated by using of frequency analysis for the each variant and working condition.

Copyright © 2013 by ASME

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