%0 Journal Article
%A Wei, Jieli
%A Zhang, Jingyu
%A He, Xiaomin
%A Jin, Yi
%A Li, Ji
%A Zheng, Mei
%D 2019
%I Begell House
%K impinging-film cooling, cooling effectiveness, film cooling
%N 13
%P 1285-1305
%R 10.1615/HeatTransRes.2019025848
%T EFFECTIVENESS OF IMPINGING-FILM COOLING FOR DIFFERENT INDUCTING SLABS
%U https://www.dl.begellhouse.com/journals/46784ef93dddff27,3e928f7d07354f73,36d134ad5dc86283.html
%V 50
%X In this paper, the effects of the impinging-film cooling effectiveness η for different inducting slabs are investigated experimentally and numerically. The cross section of an inducting slab (Rec or Tri), the layout of the cooling scheme (f-type and t-type) and an inducting channel (convergent, uniform, and divergent) were considered. The mainstream temperature was 403 K; and that of the coolant was ambient (298 K). The density flow ratio (DFR) ranging from 2.30 to 9.70 was considered. The cooling effectiveness η was obtained from experiment, while a numerical solution gave the detailed flow characteristics. The results show that the cooling effectiveness η increases with a raise in DFR. Triangular cross-sectional inducting slab (Tri) shows larger cooling effectiveness η as well as lower turbulence intensity than that of rectangular one (Rec) in an f-type layout. The comparison of the different cooling layouts shows that under the same conditions, the f-type layout presents better cooling performance than that of the t-type one. For inducting channel alteration, a uniform one gives better cooling performance in the initial section of the film with streamwise location x/d < 18, whereas a convergent one performs best after x/d = 18.
%8 2019-07-24