Prediction of Turbulent Flow and Heat Transfer Within Rotating Smooth UShaped Passage
-
摘要: 数值模拟了旋转状态下涡轮叶片U形内冷通道湍流流场和温度场的分布,分析了流阻和换热的变化规律.结果表明,旋转状态下哥氏力、离心力和浮升力的共同作用使得流场发生了复杂的变化.旋转强化了换热,减小了流阻.但旋转使得换热在各个面换热能力分布不均,增加了温度梯度.Abstract: A two-equation turbulence model with additional term for Coriolis and buoyancy was used to predict turbulent flow and heat transfer in a rotating smooth serpentine passage. Using pressurized air as the coolant, operating conditions were selected to closely match the real turbine operating parameters. The results indicated that increasing the rotation number tend to increase averaged Nu value and the decrease Eu value, though there are variations in heat transfer on different sides.
-
Key words:
- gas turbines /
- cooling blades /
- convective heat transfer /
- spining
-
[1] Zhang Y, Chiou J. Local heat transfer distribution in a rotating serpention rib-roughened flow passage [J]. Transactions of the ASME, Journal of heat transfer, 1993, 115:560~567 [2] Hsieh S S, Liu W J. Heat transfer coefficients in an orthogonally rotating two-pass channels with two opposite ribbed walls[J]. ASME Journal of Heat Transfer, 1995,117:69~78 [3] Stephens M A, Lin Y L, Cicinskas K C, et al. Flow and heat transfer in a U-shaped duct with and without rotation. AIAA 97-3004, 1997 [4] Sandip Dutta, Malcolm J Andrews, Han Je-Chin. Prediction of turbulent flow and heat transfer in rotating square and rectangular smooth channels. ASME 96-GT-234, 1996 [5] 严泽想,陶 智.非交错网格求解传热及流体流动[J].推进技术,1997,18(5):73~77 Yan Zexiang, Tao Zhi. Numerical solution of heat transfer and fluid flow on nonstaggered grids[J]. Journal of Propulsion Technology, 1997,18(5):73~77(in Chinese) -
点击查看大图
计量
- 文章访问数: 2099
- HTML全文浏览量: 19
- PDF下载量: 777
- 被引次数: 0
下载:
