Effect of pulsed film cooling on leading edge film effectiveness

Lamyaa El-Gabry, Richard B. Rivir

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Detailed film effectiveness measurements have been made on a cylindrical leading edge surface for steady and pulsating flow. The film hole is off-centered by 21.5° from the centerline and angled 20° to the surface and 90° from the stream wise direction. Two jet-to-cross-flow velocity ratios have been considered: VR = 1 and 2 which correspond to blowing ratio of 1 and 2, respectively. The pulsating frequency is 10 Hz and the duty cycle is 50%. Comparisons between film effectiveness with a pulsating film and a continuous film show that for the same blowing ratio, the effectiveness of the film drops by a factor of 2 when the flow is pulsed. Hotwire measurements are made to characterize the pulsating velocity waveform at the exit of the film exit and verify the integrity of the pulse. The variation in the measured surface adiabatic wall temperature over the pulsing duration is very small suggesting a large thermal inertia that keeps the wall surface largely unaffected by the time scale of the pulsations; this holds true for both blowing ratios tested.

Original languageEnglish (US)
Title of host publicationASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
Pages1403-1409
Number of pages7
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2010
Externally publishedYes
EventASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010 - Vancouver, BC, Canada
Duration: Nov 12 2010Nov 18 2010

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
NumberPARTS A AND B
Volume7

Conference

ConferenceASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
CountryCanada
CityVancouver, BC
Period11/12/1011/18/10

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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    El-Gabry, L., & Rivir, R. B. (2010). Effect of pulsed film cooling on leading edge film effectiveness. In ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010 (PARTS A AND B ed., pp. 1403-1409). (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 7, No. PARTS A AND B). https://doi.org/10.1115/IMECE2010-37354