抄録
This paper describes the results of experimental and numerical studies about the dynamics of the juncture flow and the associated heat transfer in the leading-edge endwall region of a symmetric airfoil. The effect of approach boundary layer thickness and main-stream velocity was investigated. By using a Particle Image Velocimetry (PIV), instantaneous flow field data near the junction of a symmetric airfoil and its endwall have been extracted. Local heat transfer coefficient distribution was assessed by micrometric measurements of ablation depth of a naphthalene film. The value of the primary peak increases as the free velocity increases and the positions of secondary peak seems to slightly approach the leading edge with the decrease of boundary layer thickness. Furthermore, we compared experimental results with Detached eddy simulation (DES) results, and obtained good agreement.
