TY - JOUR
T1 - Effect of shape and distribution of pin-fins on the flow and heat transfer characteristics in the rectangular cooling channel
AU - Jin, Wei
AU - Wu, Junmei
AU - Jia, Ning
AU - Lei, Jiang
AU - Ji, Wentao
AU - Xie, Gongnan
N1 - Publisher Copyright:
© 2020
PY - 2021/3
Y1 - 2021/3
N2 - Pin-fin arrays play a very important role in heat transfer enhancement for turbine blade trailing edge. To find a configuration with better heat transfer effect and lower flow resistance, the flow and heat transfer characteristics of several rectangular channels with staggered pin-fins of different shapes (circular, elliptic, oblong, teardrop, lancet and NACA) are studied numerically and then the effects of the spanwise and streamwise spacing of the teardrop and NACA pin-fins are investigated and compared with circular pin-fins. Reynolds number varies from 5 × 103 to 3 × 104. The ratio of streamwise spacing to diameter (X/D) varies from 2.5 to 5, and the ratio of spanwise spacing to diameter (S/D) varies from 2 to 4. It is found that the teardrop and NACA pin-fins are relatively better than the other four pin-fins, and the NACA and teardrop pin-fins at S/D = 3 and X/D = 2.5 have the better flow and heat transfer performance in comparison with circular pin-fins. Moreover, the NACA pin-fins deserve more attentions and work for its potential application in the trailing edge cooling of the actual turbine blades because it is easier to machine based on its reliable profile equation.
AB - Pin-fin arrays play a very important role in heat transfer enhancement for turbine blade trailing edge. To find a configuration with better heat transfer effect and lower flow resistance, the flow and heat transfer characteristics of several rectangular channels with staggered pin-fins of different shapes (circular, elliptic, oblong, teardrop, lancet and NACA) are studied numerically and then the effects of the spanwise and streamwise spacing of the teardrop and NACA pin-fins are investigated and compared with circular pin-fins. Reynolds number varies from 5 × 103 to 3 × 104. The ratio of streamwise spacing to diameter (X/D) varies from 2.5 to 5, and the ratio of spanwise spacing to diameter (S/D) varies from 2 to 4. It is found that the teardrop and NACA pin-fins are relatively better than the other four pin-fins, and the NACA and teardrop pin-fins at S/D = 3 and X/D = 2.5 have the better flow and heat transfer performance in comparison with circular pin-fins. Moreover, the NACA pin-fins deserve more attentions and work for its potential application in the trailing edge cooling of the actual turbine blades because it is easier to machine based on its reliable profile equation.
KW - Flow resistance
KW - Heat transfer
KW - Pin-fins
KW - Trailing edge cooling
UR - http://www.scopus.com/inward/record.url?scp=85097721173&partnerID=8YFLogxK
U2 - 10.1016/j.ijthermalsci.2020.106758
DO - 10.1016/j.ijthermalsci.2020.106758
M3 - 文章
AN - SCOPUS:85097721173
SN - 1290-0729
VL - 161
JO - International Journal of Thermal Sciences
JF - International Journal of Thermal Sciences
M1 - 106758
ER -