期刊
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
卷 161, 期 -, 页码 -出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2020.106758
关键词
Trailing edge cooling; Pin-fins; Heat transfer; Flow resistance
资金
- National Science and Technology Major Project [2017-ll-0003-0027]
Numerical studies revealed that teardrop and NACA pin-fins exhibit better performance in heat transfer enhancement for turbine blade trailing edge compared to circular, elliptic, oblong, and lancet pin-fins. Under certain spanwise and streamwise spacings, NACA pin-fins show superior cooling effects in the trailing edge of turbine blades.
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 x 10(3) to 3 x 10(4). 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.
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