30°预旋进气旋转盘流动与换热特性的实验

Flow and heat transfer in rotor-stator system with pre-swirl angle of 30°

用实验的方法对具有30°预旋进气的旋转盘附近冷气流动与换热特性进行了研究,得到了静盘表面压力、转盘表面温度、局部努赛尔特数的分布及平均努赛尔特数的变化.结果显示静止盘罩表面的压力随着半径的增加而增加,随转速的增加而增加.转盘表面的局部努赛尔特数在r<0.7R的区域基本不变,r>0.7R的区域里,局部努赛尔特数随r的增加而增大.该预旋角情况下,进气雷诺数对盘面平均努赛尔特数的影响大于旋转雷诺数.

An experimental study of the flow and heat transfer characteristics in a pre-swirl rotor-stator system was described. Pre-swirl cooling air through nozzles with angle of 30° in the stator flows radially outwards and leaves system from the clearance between rotor and stator. The distributions of the pressure on the stator surface, temperature, local and averaged Nusselt number on the rotating disk surface were obtained from the tests. The experiments reveal that the pressure on the stator surface increase as the radius and also increase as rotating speed. The local Nu number will keep invariable when r 〈 0. 7R （R is effective radius of rotating disk） in the rotating disk surface, but it will increase rapidly as radius when r 〉0.7R. The cooling flow rate have more effects on average Nu number than rotating speed in this pre- swirl angle.