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开展了一种新型机匣处理扩大轴流风扇/压气机稳定裕度的试验研究。在低速风扇试验台上模拟旋转进气畸变,分析此种畸变进气条件对压气机工作性能造成的影响,并且考察一种新型机匣处理的扩稳效果。旋转进气畸变下,压升-流量特性曲线失速边界向右下偏移,压气机失速裕度明显降低。新型机匣处理在旋转进气畸变条件下对风扇/压气机有显著的扩稳效果,较小畸变转速(200,500r/min)情况下,新型机匣处理能提高压气机稳定裕度10%~20%,同时并没有带来明显的效率损失;畸变转速为800r/min情况下,机匣处理的扩稳效果相比并不明显,但可以提高压气机工作效率1%~2%。较大畸变转速情况下,畸变方向不同,机匣处理扩稳效果有所差别:正向畸变时机匣处理提高压气机失速裕度3%~10%,提高效率1%左右;而反向畸变时,失速裕度均提高10%以上,甚至达到20%,但压气机效率损失在1%左右。
A new type of casing treatment experimental study on expanding the stability margin of axial fan / compressor was carried out. The rotary intake air distortion was simulated on a low-speed fan test rig to analyze the effect of such distorted intake conditions on the performance of the compressor and to investigate the effect of stabilizing the stability of a new casing. Rotational inlet distortion, pressure-flow characteristics of the stall boundary shift to the right down, the compressor stall margin decreased significantly. The new casing treatment shows a significant stabilizing effect on the fan / compressor under the condition of rotating intake air distortion. The new casing treatment can improve the stability margin of the compressor by 10% ~ 100% with the small distortion speed (200,500r / min) 20%, while no significant loss of efficiency. When the distortion speed is 800r / min, the stability of the casing treatment is not obvious, but it can improve the working efficiency of the compressor by 1% ~ 2%. In the case of larger distortion speed, the distortion direction is different, and the stability of the casing treatment is different: the casing treatment improves the compressor stall margin by 3% ~ 10% when the forward distortion is applied, and improves the efficiency by about 1%; while in the case of reverse distortion , Stall margin increased by 10% or more, even up to 20%, but the compressor efficiency loss of about 1%.