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http://dx.doi.org/10.3795/KSME-B.2013.37.7.655

Effect of Secondary Flow Direction on Film Cooling Effectiveness  

Park, Sehjin (Dept. of Mechanical Engineering, Yonsei Univ.)
Choi, Seok Min (Dept. of Mechanical Engineering, Yonsei Univ.)
Sohn, Ho-Seong (Dept. of Mechanical Engineering, Yonsei Univ.)
Chung, Heeyoon (Dept. of Mechanical Engineering, Yonsei Univ.)
Cho, Hyung Hee (Dept. of Mechanical Engineering, Yonsei Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.7, 2013 , pp. 655-663 More about this Journal
Abstract
Several studies of film cooling were accomplished with a secondary flow channel parallel to the main flow. In real turbine blades, however, the direction of the secondary flow channel is generally normal to the main flow. Thus, this study performs a numerical analysis to investigate the effects of the direction of secondary flow on the effectiveness of double-jet film cooling. The blowing ratio is 1 and 2, and the lateral injection angle is $22.5^{\circ}$. The parallel channel case creates a well-developed anti-kidney vortex with a blowing ratio of 1, and the laterally averaged film cooling effectiveness of the parallel channel is enhanced compared to the normal channel. The normal channel shows higher performance with a blowing ratio of 2. Both cases show high film cooling effectiveness. These phenomena can be attributed to a high blowing ratio and flow rate rather than an anti-kidney vortex.
Keywords
Double-jet Film Cooling; Secondary Flow Channel; Film Cooling Effectiveness; Anti-Kidney Vortex; Numerical Analysis;
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