TY - JOUR
T1 - Experimental and numerical investigations on double-jet film-cooling with different mainstream incidence angles
AU - Yao, Jiaxu
AU - Su, Pengfei
AU - He, Jianhong
AU - Wu, Junmei
AU - Lei, Jiang
AU - Fang, Yu
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/2/5
Y1 - 2020/2/5
N2 - The present work focuses on the effects of the mainstream incidence angle (i) on the double-jet film-cooling (DJFC) structure, with cooling effectiveness measured by pressure sensitive paint (PSP) and flow field obtained by RANS simulations. Seven incidence angle conditions ranged from −30° to +30° are studied. The relative angle between the two DJFC holes is a constant of 90°. The film holes have a diameter (d) of 5 mm and incline 35° to the surface. The spanwise distance (p/d) and the streamwise distance (s/d) are kept as 1.0 and 3.0, respectively. Two blowing ratios (M = 0.5 and 1.5) and two density ratios (DR = 1.0 and 2.5) are considered. Results show that the mainstream incidence angle has a significant effect on the performances of double-jet film-cooling, while the affecting trend varies with operation conditions. The high effectiveness of the double-jet film-cooling is caused by the anti-kidney vortex and this flow structure is directly influenced by the mainstream incidence angle. Consequently, a proper incidence angle leads to beneficial anti-kidney vortex effects and thus high film-cooling effectiveness, while for other incidence angle cases the cooling performance deteriorates.
AB - The present work focuses on the effects of the mainstream incidence angle (i) on the double-jet film-cooling (DJFC) structure, with cooling effectiveness measured by pressure sensitive paint (PSP) and flow field obtained by RANS simulations. Seven incidence angle conditions ranged from −30° to +30° are studied. The relative angle between the two DJFC holes is a constant of 90°. The film holes have a diameter (d) of 5 mm and incline 35° to the surface. The spanwise distance (p/d) and the streamwise distance (s/d) are kept as 1.0 and 3.0, respectively. Two blowing ratios (M = 0.5 and 1.5) and two density ratios (DR = 1.0 and 2.5) are considered. Results show that the mainstream incidence angle has a significant effect on the performances of double-jet film-cooling, while the affecting trend varies with operation conditions. The high effectiveness of the double-jet film-cooling is caused by the anti-kidney vortex and this flow structure is directly influenced by the mainstream incidence angle. Consequently, a proper incidence angle leads to beneficial anti-kidney vortex effects and thus high film-cooling effectiveness, while for other incidence angle cases the cooling performance deteriorates.
KW - Double-jet film-cooling (DJFC)
KW - Incidence angle
KW - Pressure sensitive paint (PSP)
UR - https://www.scopus.com/pages/publications/85132584087
U2 - 10.1016/j.applthermaleng.2019.114737
DO - 10.1016/j.applthermaleng.2019.114737
M3 - 文章
AN - SCOPUS:85132584087
SN - 1359-4311
VL - 166
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
M1 - 114737
ER -