Experimental investigation on the overall cooling effectiveness of t-type impinging-film cooling

Publication date: 5 January 2018
Source:Applied Thermal Engineering, Volume 128
Author(s): Jingyu Zhang, Ce Yuan, Pengfei Ji, Jieli Wei, Xiaomin He
This paper presents an experimental investigation of impinging-film cooling concerning the effects of various factors on overall cooling effectiveness η. The factors include blowing ratio M (0.31≤M≤1.84), non-dimensional jet-to-plate pitch Zn/d (1≤Zn/d≤2), non-dimensional spacing of jet holes Yn/d (1.6≤Yn/d≤2.4) and diameter of jet hole. The results show that overall cooling effectiveness invariably increases with a raise in blowing ratio. As non-dimensional jet-to-plate pitch increases, the cooling performs better. The decline of non-dimensional spacing of jet holes improves the overall cooling effectiveness at higher blowing ratios (M≥0.91), which was not observed in cases with low blowing ratios (M≤0.61). The variation of hole diameter (1.0–1.8mm) has little influence on cooling performance.



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