部分喷嘴关闭对预旋供气系统供气参数影响的实验研究

In order to study the effects of partial nozzle flow path closure on the characteristic parameters such as air supply mass flow rate and temperature of the pre-swirl air supply system, experiments were carried out under conditions that partial nozzle flow path was open and closed. The results show that as the nozzle pressure ratio increases, the nozzle discharge coefficient defined by the geometric flow area increases first and then remains basically unchanged. The influence of rotation on the discharge coefficient of the pre-swirl nozzle is within 1.6%, which can be ignored. When the system pressure ratio is 1.30, due to the valve is not closed tightly and the variation of pressure in the pre-swirl cavity after closing the valve, the amplitude reduction of air supply mass flow rate is 67.8% ~ 81.8% of that of nozzle geometric flow area, which is less than that of nozzle geometrical flow area. Closing the valve causes the air supply temperature to decrease about 1.2~2.4K in the experimental state.