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International Heat Transfer Conference 13

ISBN Печать: 1-56700-226-9 (CD)
ISBN Онлайн: 1-56700-225-0

EXPERIMENTAL STUDY ON ARRANGEMENT EFFECTS OF INJECTION HOLES OF THE TURBINE BLADE LEADING EDGE ON THE FILM COOLING PERFORMANCE

DOI: 10.1615/IHTC13.p22.200
page 10

K.-S. Kim
Sungkyunkwan University, Suwon, Korea

Youn J. Kim
School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, South Korea

Аннотация

To enhance the film cooling performance in the vicinity of the turbine blade leading edge, the flow characteristics of the film-cooled turbine blade have been investigated using a cylindrical body model. The inclination of the cooling holes is along the radius of the cylindrical wall and 20 deg relative to the spanwise direction. Mainstream Reynolds number based on the cylinder diameter was 1.01×105 and 0.69×105, and the mainstream turbulence intensities were about 0.2% in both Reynolds numbers. CO2 was used as coolant to simulate the effect of density ratio of coolant-to-mainstream. Furthermore, the effect of coolant flow rates was studied for various blowing ratios of 0.4, 0.7, 1.1 and 1.4, respectively. In experiment, spatially-resolved temperature distributions along the cylindrical body surface were visualized using infrared thermography (IRT) in conjunction with thermocouples, digital image processing, and in situ calibration procedures. This comparison shows the results generated to be reasonable and physically meaningful. The film cooling effectiveness of measurement (0.29 mm×0.33 mm per pixel) presents high spatial and temperature resolutions compared to other studies. Results show that the blowing ratio has a strong effect on film cooling effectiveness and the coolant trajectory is sensitive to the blowing ratio. The local spanwise-averaged effectiveness can be improved by locating the first-row holes near the second-row holes.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION