Heat transfer coefficients over a flat surface with air and CO{sub 2} injection through compound angle holes using a transient liquid crystal image method
- Texas A and M Univ., College Station, TX (United States)
This paper presents the detailed heat transfer coefficients over a flat surface with one row of injection holes inclined streamwise at 35 deg for three blowing ratios (M = 0.5--2.0). Three compound angles of 0, 45, and 90 deg with air (D.R. = 0.98) and CO{sub 2} (D.R. = 1.46) as coolants were tested at an elevated free-stream turbulence condition (Tu {approx} 8.5%). The experimental technique involves a liquid crystal coating on the test surface. Two related transient tests obtained detailed heat transfer coefficients and film effectiveness distributions. Heat transfer coefficients increase with increasing blowing ratio for a constant density ratio, but decrease with increasing density ratio for a constant blowing ratio. Heat transfer coefficients increase for both coolants over the test surface as the compound angle increases from 0 to 90 deg. The detailed heat transfer coefficients obtained using the transient liquid crystal technique, particularly in the near-hole region, will provide a better understanding of the film cooling process in gas turbine components.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 516729
- Report Number(s):
- CONF-950629-; ISSN 0889-504X; TRN: IM9738%%38
- Journal Information:
- Journal of Turbomachinery, Vol. 119, Issue 3; Conference: 40. International gas turbine and aeroengine congress and exposition, Houston, TX (United States), 5-8 Jun 1995; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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