Leading edge films cooling heat transfer with high free stream turbulence using a transient liquid crystal image method

摘要

This paper studies film effectiveness and heat transfer coefficients on a large scale symmetric circular leading edge with three rows of film holes. The film hole configuration focuses on a smaller injection angle of 20 deg. And a larger hole pitch with respect to the hole diameter (P/d=7.86). The study includes four blowing ratios (M=1.0,1.5,2.0 and 2.5),two Reynolds numbers (Re=30,000 and 60,000), and two free stream turbulence levels (nominally Tu=1/100 and 20/100 depending on the Reynolds number).