The cooling flow rate have more effects on average nu number than rotating speed in this pre-swirl Angle.
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。
2
The adoption of positive pre-swirl and low reaction degree increases the tip performance effectively, negative pre-swirl is required at hub for stator based on conventional design method;