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Validation of CFD Predicted Discharge Coefficients for Thick Plate Orifices With Approach Flow Perpendicular and Inclined to the Orifice Axis

[+] Author Affiliations
Anish Kumar Gupta, Dhinagaran Ramachandran

Honeywell Technology Solutions, Bangalore, India

Douglas Ramerth

Honeywell Engines Systems & Services, Phoenix, AZ

Paper No. GT2008-50742, pp. 1579-1588; 10 pages
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME


The flow discharge through thick orifices with approaching flow normal and inclined to the orifice axis was numerically predicted. The objective is to validate Fluent code predictions of discharge coefficient against Rohde et al. experimental data and arrive at an optimum mesh in terms of effort, simulation time and accuracy. CFD simulations were performed on several Rohde et al. experimental models with orifice thickness to length ratio varying from 0.5 to 4.0, with sharp and rounded inlet edges and orifice axis inclined 45 degrees to the approaching flow. The approach Mach number varies from 0.07 to 0.55 and orifice velocity head ratio ranges from 1.3 to 200. Simulations are performed using FLUENT V6.3 with k-ω SST model and 2nd order discretization scheme. Coarse mesh results at selected test points were compared with fine mesh results and a best meshing practice was determined. CFD computation at selected points was also performed with Realizable K-ε, v2f and RSM turbulence model. CFD predictions of discharge coefficient show good agreement with Rohde et al. experimental data.

Copyright © 2008 by ASME



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