RT Journal Article
ID 36d134ad5dc86283
A1 Wei, Jieli
A1 Zhang, Jingyu
A1 He, Xiaomin
A1 Jin, Yi
A1 Li, Ji
A1 Zheng, Mei
T1 EFFECTIVENESS OF IMPINGING-FILM COOLING FOR DIFFERENT INDUCTING SLABS
JF Heat Transfer Research
JO HTR
YR 2019
FD 2019-07-24
VO 50
IS 13
SP 1285
OP 1305
K1 impinging-film cooling
K1 cooling effectiveness
K1 film cooling
AB 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.
PB Begell House
LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,3e928f7d07354f73,36d134ad5dc86283.html