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为考察在总压进气畸变条件下对压气机流动稳定性的影响以及如何进行有效扩稳,开展了一种新型机匣处理扩大轴流风扇/压气机稳定裕度的实验研究。主要内容包括:进气畸变下的压气机流量-压比特性实验,研究新型机匣处理的扩稳效果,并对压气机工作效率的影响进行了评估。实验结果表明:①进气畸变下,压气机压升-流量特性曲线失速边界向右下偏移,即压气机失速裕度变小,并且畸变程度越高,失速裕度损失越多;②新型机匣处理在进气畸变条件下对风扇/压气机有显著的扩稳效果,失速裕度可提高5%~8%;③较大(20%以上)进气畸变条件下,机匣处理会带来1%~2%左右的压气机效率损失,而较小(20%以内)进气畸变条件下,机匣处理在扩稳的同时,可以基本保持压气机工作效率不变。
In order to investigate the influence on the compressor flow stability and how to stabilize the compressor under the condition of the total pressure of intake air distortion, a new experimental study on expanding the stability margin of the axial fan / compressor by the casing treatment was carried out. The main contents include: compressor flow-pressure ratio experiment under inlet distortion, research on stability improvement of new casing treatment, and evaluation of the effect of compressor working efficiency. The experimental results show that: (1) Under the distortion of intake air, the stall boundary of the pressure rise-flow characteristic curve of the compressor is offset to the right and lower, that is, the compressor stall margin becomes smaller, and the higher the distortion, the more loss of stall margin; The casing treatment has a significant stabilizing effect on the fan / compressor under the conditions of intake air distortion, and the stall margin can be increased by 5% ~ 8%. ③ Under large (more than 20%) intake air distortion conditions, the casing treatment Resulting in compressor efficiency loss of about 1% to 2%. However, under the condition of smaller (less than 20%) intake air distortion, the casing treatment can basically maintain the compressor working efficiency unchanged while stabilizing.