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Experimental Study on Orifice Discharge Coefficients in Impingement Cooling With Confined Cross Flow

[+] Author Affiliations
Andre Schellenberg, Mats Kinell, Daniel Eriksson

Siemens Industrial Turbomachinery AB, Finspong, Sweden

Paper No. GT2015-42475, pp. V05AT11A009; 9 pages
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 5A: Heat Transfer
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5671-0
  • Copyright © 2015 by Siemens Energy, Inc.


This work experimentally investigates the effects of confined cross flow and geometrical parameters in impingement flows on the jet discharge coefficient, Cd. Such cooling configurations are common in the gas turbine industry and all properties were chosen to be applicable in real applications.

The effect on Cd was studied for square edged orifices with thickness to diameter ratio l/d = 1 in the range of jet to cross flow mass velocity ratio 0 ≤ Gc/Gj ≤ 6 at a jet Reynolds number of 104. The distance between orifices in the span wise yn/d = 2.5–8 and stream wise xn/d = 2.5–7 directions as well as the spacing to the target plate z/d = 1–3 were investigated.

Generally, the conclusions from previous studies were confirmed. An exception to this was the observed increase of Cd with increasing Gc/Gj for Gc/Gj < 0.5.

A correlation was developed for the discharge coefficient with the new experimental data as function of z/d, yn/d and Gc/Gj. The resemblance to the measured data was excellent with a maximum deviation of 4%.

Copyright © 2015 by Siemens Energy, Inc.



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