针对带45°肋片圆形弯头U型通道进行了传热和压力分布特性的实验研究.实验中进口雷诺数变化范围在30 000~55 000之间.研究表明,肋片引起的横向二次流在弯头前区域是强化传热的主要因素.不同雷诺数下传热分布和压力分布的趋势完全一致,但弯头区后半段上传热分布有所差异.通道中的最大压降出现在弯头区,进口雷诺数越大,弯头损失系数和总损失系数都有所减小.流体在圆形弯头中,加速效果没有矩形弯头强烈,弯头区和弯头后的传热较矩形弯头都有较大幅度地减小. The experimental study on the heat transfer and pressure distribution of the U-shaped channel with 45 ° fin was carried out.The inlet Reynolds number ranged from 30 000 to 55 000. The results showed that the transverse The secondary flow in the area before the elbow is the main factor to intensify the heat transfer.The trend of heat transfer and pressure distribution at different Reynolds numbers are the same, but the heat transfer distribution in the second half of the elbow zone is different.The maximum pressure drop Appears in the elbow zone, the greater the inlet Reynolds number, the elbow loss coefficient and the total loss factor are reduced.Fluid in the round elbow, the acceleration effect is not a strong rectangular elbow, bend area and elbow Heat transfer than the rectangular elbow have a more substantial reduction.