Film cooling performance is studied for cylindrical holes embedded in craters. Different crater geometries are considered for a typical crater depth. Cratered holes may occur when blades are coated with thermal barrier coating layers by masking the hole area during thermal barrier coating (TBC) spraying, resulting in a hole surrounded by a TBC layer. The film performance and behavior is expected to be different for the cratered holes compared to standard cylindrical holes. Detailed heat transfer coefficient and film effectiveness measurements are obtained simultaneously using a single test transient IR thermography technique. The study is performed at a single mainstream Reynolds number based on freestream velocity and film-hole diameter of 11,000 at four different coolant-to-mainstream blowing ratios of 0.5, 1.0, 1.5, and 2.0. The results show that film cooling effectiveness is slightly enhanced by cratering of holes, but a substantial increase in heat transfer enhancement negates the benefits of higher film effectiveness. Three different crater geometries are studied and compared to a base line flush cylindrical hole, a trenched hole, and a typical diffuser shaped hole. Computational fluid dynamics simulation using FLUENT was also performed to determine the jet-mainstream interactions associated with the experimental surface measurements.
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January 2009
Research Papers
Film Cooling Measurements for Cratered Cylindrical Inclined Holes
Yiping Lu,
Yiping Lu
Mechanical Engineering,
Virginia Tech
, Blacksburg, VA 24061
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Alok Dhungel,
Alok Dhungel
Mechanical Engineering,
Virginia Tech
, Blacksburg, VA 24061
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Ronald S. Bunker
Ronald S. Bunker
GE Global Research Center
, Niskayuna, NY 12301
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Yiping Lu
Mechanical Engineering,
Virginia Tech
, Blacksburg, VA 24061
Alok Dhungel
Mechanical Engineering,
Virginia Tech
, Blacksburg, VA 24061
Srinath V. Ekkad
Ronald S. Bunker
GE Global Research Center
, Niskayuna, NY 12301J. Turbomach. Jan 2009, 131(1): 011005 (12 pages)
Published Online: October 2, 2008
Article history
Received:
June 11, 2007
Revised:
June 21, 2007
Published:
October 2, 2008
Citation
Lu, Y., Dhungel, A., Ekkad, S. V., and Bunker, R. S. (October 2, 2008). "Film Cooling Measurements for Cratered Cylindrical Inclined Holes." ASME. J. Turbomach. January 2009; 131(1): 011005. https://doi.org/10.1115/1.2950055
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