The film effectiveness and coolant jet temperature profile on the suction side of a gas turbine blade were measured using a transient liquid crystal and a cold-wire technique, respectively. The blade has only one row of film holes near the gill hole portion on the suction side of the blade. Tests were performed on a five-blade linear cascade in a low-speed wind tunnel. The mainstream Reynolds number based on cascade exit velocity was Upstream unsteady wakes were simulated using a spoke-wheel type wake generator. Coolant blowing ratio was varied from 0.6 to 1.2. Wake Strouhal number was kept at 0 and 0.1. Results show that unsteady wake reduces film cooling effectiveness. Results also show that film injection enhances local heat transfer coefficient while the unsteady wake promotes earlier boundary-layer transition. The development of coolant jet temperature profiles could be used to explain the film cooling performance. [S0889-504X(00)00402-5]
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April 2000
Technical Papers
Unsteady Wake Effect on Film Temperature and Effectiveness Distributions for a Gas Turbine Blade
Shuye Teng,
Shuye Teng
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123
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Dong Kee Sohn,
Dong Kee Sohn
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123
11
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Je-Chin Han
Je-Chin Han
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123
Search for other works by this author on:
Shuye Teng
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123
Dong Kee Sohn
11
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123
Je-Chin Han
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123
Contributed by the International Gas Turbine Institute and presented at the 44th International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, Indiana, June 7–10, 1999. Manuscript received by the International Gas Turbine Institute February 1999. Paper No. 99-GT-172. Review Chair: D. C. Wisler.
J. Turbomach. Apr 2000, 122(2): 340-347 (8 pages)
Published Online: February 1, 1999
Article history
Received:
February 1, 1999
Citation
Teng , S., Sohn, D. K., and Han, J. (February 1, 1999). "Unsteady Wake Effect on Film Temperature and Effectiveness Distributions for a Gas Turbine Blade ." ASME. J. Turbomach. April 2000; 122(2): 340–347. https://doi.org/10.1115/1.555457
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