An experimental study of film cooling effectiveness by using PIV and PSP techniques

Blake Johnson, Kai Zhang, Wei Tian, Hui Hu

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

Abstract

An experimental study was conducted to investigate the performance of film cooling injection from a row of circular holes spaced laterally across a flat plate. A highresolution PIV system was used to conduct flow field measurements to reveal the tendencies of the coolant stream to remain attached to the test plate or to separate from it, and a Pressure Sensitive Paint (PSP) technique was used to map the distribution of the corresponding adiabatic cooling effectiveness on the surface of the test plate based on a mass-flux analog to traditional thermal effectiveness measurements. The effects of the density ratio between the cooling jet stream and mainstream flows, P, are investigated by performing isothermal experiments at fixed mass-flux ratios but using coolant streams of N2 (P=0.97), air (P=1.00), and CO2 (P=1.53). An accompanying analysis of alternative parametric scaling quantities, such as the momentum flux ratio I and bulk coolant-to-mainstream velocity ratio Vr, is performed to illuminate the extent to which this flow scenario can be described using purely kinematic means. It was found that those quantities that give more weight to P (M and then I) have more success to collapse data from varying P flows for relatively low coolant flow rates, while the bulk velocity ratio Vr may be used with some success to scale the effectiveness from jets of higher bulk velocity ratio.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 2013
Externally publishedYes
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
Country/TerritoryUnited States
CityGrapevine, TX
Period1/7/131/10/13

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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