盘腔进气位置对径向预旋系统的影响

为减少径向预旋系统的流动损失,运用数值模拟方法对不同盘腔进气位置的径向预旋系统进行分析,结果表明:随着盘腔进气径向位置的增加,预旋喷嘴出口气流旋流比随之逐渐减小,径向预旋系统的温降系数及总压损失系数均随之逐渐增大。当旋转雷诺数等于7.9×106,盘腔进气位置由低位向高位变化时温降系数最大可增加525%,同时总压损失系数增加3.93%。径向预旋系统内比熵增主要发生在预旋喷嘴和共转腔,约占系统总体比熵增的80%。随着盘腔进气径向位置的增加,径向预旋系统总体比熵增降低,预旋喷嘴比熵增占比逐渐增大,共转腔比熵增占比逐渐减小。

Influence of air entraining position on radial pre-swirl system

To reduce the flow loss in radial pre-swirl system, numerical simulation method was used to analyze the radial pre-swirl system with different air entraining positions of the cavity. The results showed that the swirl ratio of air flow at the pre-swirl nozzle outlet decreased, the temperature drop coefficient and total pressure loss coefficient increased with the increase of the radial air entraining position. When rotational Reynolds number was 7.9×106, the temperature drop coefficient increased by 525% and the total pressure loss coefficient increased by 3.93% when the air entrainment position changed from low to high. The specific entropy increment in the radial pre-swirl system mainly occurred in the pre-swirl nozzle and the co-rotating cavity, accounting for about 80% of the total specific entropy increment. With the increase of the radial air entraining position, the overall specific entropy increment decreased, and the specific entropy increment proportion of the pre-swirl nozzle increased. However, the spectific entropy increment proportion of co-rotating cavity decreased.