Effects of Slot Geometry on the Film Cooling Performance

Abstract

Abstract:A numerical study was conducted to investigate the film cooling performance of a straight slot, a converging slot and a diffuser slot. Firstly, a shear stress transport (SST) k-ω model and a Reynolds stress turbulence model (RSTM) were respectively used to calculate the slot film cooling, and the calculation results were compared with the existing literature data. The comparison indicates that for the same mesh gird, the SST model shows a better performance in simulating the flow and heat transfer characteristics in the slot film cooling. Based on the validated model, the film cooling effectiveness of the different kinds of slot with the same jet angle (45°) as well as the same exit geometry at different blowing ratios was obtained. The results show the slot geometry plays an important role in the film cooling performance, and the straight slot has the best film cooling performance than the other two slots. The temperature field, streamline traces and the turbulent kinetic energy field around the film cooling slots at M = 4 are also obtained to analyze the underlying mechanisms of the slot geometry influencing the film cooling performance.

Key words:slot film cooling,flow,heat transfer,numerical computation

CLC Number:

TK 47

WAN Chao-Yi-1, RAO Kun-2, RAO Yu-1, XU Ya-Min-3. Effects of Slot Geometry on the Film Cooling Performance[J]. Journal of Shanghai Jiaotong University, 2012, 46(04): 550-555.

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