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Journal of Flow Visualization and Image Processing
EFFECTS OF MAINSTREAM TURBULENCE LEVEL AND INJECTION HOLE LOCATION ON FILM-COOLED STAGNATION MASS AND HEAT TRANSFER
Department of Materials Engineering, National PingTung University of Science & Technology, Shuefu Road, Neipu, Pingtung, Taiwan.
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C.
Department of Information and Electronic Commerce, Kainan University, Taoyuan, Taiwan, R.O.C.
The effects of a mainstream turbulence level and surface injection on the convective mass/heat transfer phenomena over a circular cylinder were investigated using the naphthalene sublimation technique. A test cylinder with one row of seven slanted injection holes was used to simulate the leading edge of a turbine blade. These injection holes were spaced at three hole's diameters and were angled at 30° and 90° from the surface in the spanwise and streamwise directions, respectively. Experiments were conducted at two different values of the mainstream turbulence level (Tu = 0.4%, 7.0%), three different angular locations of injection holes (θinj = 0°, 5°, 10°), and five different blowing ratio values (M = 0.0, 0.85, 1.12, 1.38, 1.63) at a constant mainstream Reynolds number of Re = 45,500. To clarify the complex nature of the flow field, the numerical simulations were also accomplished in the present work.
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