接受孔形状对预旋供气系统内气流流动影响研究

Effects of Receiver Hole Shape on Air Flow in Pre-Swirl Air Supply System

关键词:  接受孔  预旋系统  温降特性  总压损失  设计

Key words:  Receiver holes  Pre-swirl system  Temperature drop characteristics  Total pressure loss  Design

摘要:

为对比不同形状接受孔的预旋系统内气流流动特性，通过数值模拟方法，对带有不同形状接受孔的预旋系统进行了研究。研究发现：收缩型接受孔入口截面气流流通面积较大，相对速度较小，在预旋系统中的性能最优，其次是类梯型，最后是直孔型。同一旋转雷诺数下，带收缩型接受孔的预旋系统无量纲温降较直孔型提高5.8％，总压损失系数降低3.0％。三种类型接受孔的预旋系统无量纲温降和总压损失系数均随进出口压比的增加而增大，在相同压比下，收缩型接受孔预旋系统无量纲温降最大，总压损失系数最小。

Abstract:

In order to compare the airflow characteristics with different shape receiver holes， the pre-swirl system was studied by numerical simulation method. The results show that the inlet cross-section of the shrinkage receiver holes has a larger airflow area and a smaller airflow relative velocity， it is optimal in pre-swirl systems， followed by ladder-like， and the final is the straight hole type. With the same rotating Reynolds number， compared to the straight receiver holes， the dimensionless temperature drop of the shrinkage receiver holes increased by 5.8%. Simultaneously， the total pressure loss coefficient of the shrinkage receiver holes is reduced by 3.0%. For the three types of receiver holes， the dimensionless temperature drop and total pressure loss coefficient increase with the increase of the inlet and outlet pressure ratio. With the same pressure ratio， the shrinkage receiver holes has the largest dimensionless temperature drop and the lowest total pressure loss coefficient.