旋转光滑U形通道内流动和换热的数值模拟

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.

Prediction of Turbulent Flow and Heat Transfer Within Rotating Smooth U-Shaped Passage

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.