变弯度导叶对某高负荷双级风扇气动性能的影响

Influence on aerodynamic performance of a highly loaded two-stage fan with variable inlet guide vane

为了改善某高负荷双级风扇在非设计转速出现的裕度不足和转子攻角过大的问题,研究了变弯度导叶的调节对高负荷双级风扇气动性能和内部流场的影响,对比分析了不同形式变弯度导叶和传统可调导叶的性能差异.数值模拟结果表明:80%转速时高负荷双级风扇的绝热效率随着正预旋角度增加而显著增加,预旋角度为30°时的绝热效率提高了3.5%;传统可调导叶扩稳效果较优,受到大预旋角度下大损失的限制;变弯度导叶的开缝形式、开缝位置、导叶稠度均与气动性能密切相关,具体设计需要根据高负荷双级风扇工作情况进行探讨.

In order to improve the stall margin and decrease the rotor attack angle of a highly loaded two-stage fan at off-design speed, different forms of variable inlet guide vane （VIGV） and traditional adjustable inlet guide vane were simulated, and the aerodynamic performance and internal flow field of highly loaded two-stage fan were analyzed. The numerical simulation results show that： at the 80% design speed, the highly loaded two-stage fan＇s adiabatic efficiency increases obviously with the increase of the VIGV＇s positive prewhirl, and the adiabatic efficiency increases 3.5 % with prewhirl angle of 30 degrees; although traditional adjustable inlet guide vane has a better effect on the expanding stability, the loss is biggest when it needs a large prewhirl angle; the slot form, the slot position and the solidity of VIGV have a considerable influence on aerodynamic performance, with the design depending on the particular working conditions of the highly loaded two-stage fan.