Transient liquid crystal technique for convective heat transfer on rough surfaces
- Air Force Academy, Colorado Springs, CO (United States). Dept. of Aeronautics
- Allied Signal Engines, Phoenix, AZ (United States)
- Arizona State Univ., Tempe, AZ (United States). Dept. of Mechanical and Aerospace Engineering
The local heat transfer coefficients are obtained on a rough planar surface simulating in-service turbine stator vane sections. A transient experimental technique is presented that permits the determination of local heat transfer coefficients for a rough planar surface using thermochromic liquid crystals. The technique involves the use of a composite test surface in the form of a thin foil of stainless steel with roughness elements laminated over a transparent substrate. Tests are conducted on a splitter plate to provide momentum boundary layer thicknesses to roughness heights appropriate for actual turbine stator vanes. Data are reported for two roughness geometries and two free-stream velocities. The range of Reynolds numbers along with the ratio of average roughness value to momentum thickness matches the conditions encountered on the pressure side of the first-stage stator vanes in current high performance turbofan engines. A numerical simulation is conducted to validate the test method. Results for the rough surfaces investigated are compared with an available empirical relationship.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 438776
- Report Number(s):
- CONF-950629-; ISSN 0889-504X; TRN: IM9711%%240
- Journal Information:
- Journal of Turbomachinery, Vol. 119, Issue 1; Conference: 40. International gas turbine and aeroengine congress and exposition, Houston, TX (United States), 5-8 Jun 1995; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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