束腰结构扰流柱通道的传热和阻力特性

HEAT TRANSFER AND CHARACTERISTICS OF PRESSURE DROP IN WEDGE PASSAGE WITH WAIST-SHAPED PIN-FIN ARRAYS

本文对涡轮叶片尾缘中具有束腰结构扰流柱的冷却通道的传热和流动阻力特性进行了实验研究,重点研究了雷诺数、扰流柱的束腰比以及不同组合的影响.结果表明:(1)通道平均努塞尔数随着Reynolds的增加而增大,而当Reynolds数较大时,与圆柱通道相比,束腰结构扰流柱通道的换热效果稍低;(2)通道内平均努塞尔数随着束腰比的增大先增大后降低,然后有所变缓,而其压力损失却曲折波动;(3)在三排扰流柱中,第Ⅱ排束腰结构扰流柱对换热效果影响最大.第Ⅰ排影响最小.当第Ⅰ排和第Ⅲ排为束腰结构扰流柱时,其换热减弱,而压力损失系数却增大.

The heat transfer and characteristics of the fluid flow in the duct with waist-shaped pinfin arrays for the trailing edge of the turbine blade were experimentally investigated. The effect of the Reynolds number, the corset ratio κ of the pin-fin and the different combinations of row of the waist-shaped pin-fins were explored. The results show that the heat transfer increases and the pressure drop decreases with the increase of Reynolds number and the heat transfer is lower than that of round pin-fin array. Second, As the increase of the corset ratio ~c, the heat transfer enhances and then goes to evenness while the pressure drop fluctuates; third, In the three waist-shaped rows, effect of the second Row to the heat transfer is largest and the effect of the first row is the lowest. While the first or the third row is waist-shaped pin-fins, the heat transfer are weakened but the pressure drop dramatically increase.