Effect of secondary flow direction on film cooling effectiveness

Sehjin Park, Seok Min Choi, Ho Seong Sohn, Heeyoon Chung, Hyung Hee Cho

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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°. 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.

Original languageEnglish
Pages (from-to)655-663
Number of pages9
JournalTransactions of the Korean Society of Mechanical Engineers, B
Volume37
Issue number7
DOIs
Publication statusPublished - 2013 Jul

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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