对转压气机具有独特的气动布局,其失速形式相比常规布局压气机更加复杂且多变。本文在试验中通过进出口壁面静压孔和叶顶高频动态压力传感器阵列成功得到了不同转速比下的特性曲线及其失速起始-发展-恢复过程。结果表明:不同转速比下的特性曲线具有相似的变化规律,在失速起始-发展-恢复过程中均存在明显的迟滞环。当转速比≤1时,在失速起始阶段,失速扰动首先出现在后转子,随后在前后转子周向占据一定范围并旋转,方向与后转子一致。在退出失速时,失速扰动旋转速度提升且尺寸迅速减小。当转速比等于1.333时,失速扰动固定在周向某一位置并占据大概225°周向范围且几乎同时贯穿前后转子,失速恢复时失速扰动在1 s内迅速衰减直至完全消失。
Contra-rotating compressors have a unique aerodynamic configuration with a more complex and changeable stall form than conventional compressors. Through static pressure holes on the inlet and outlet wall and the high frequency dynamic pressure sensor array on the blade tip, the characteristic curves and the stall initiation-development-recovery process at different speed ratios are successfully obtained. The results show that the characteristic curves at different speed ratios have a similar variation law, with obvious hysteresis loops in the process of stall initiation-development-recovery. When the speed ratio is smaller than or equal to 1, the stall disturbance first appears in the rear rotor, and then occupies a certain range in the circumferential direction of the front and rear rotors, meanwhile rotating in the same direction as that of the rear rotor in the initiation phase of the stall. At the exit of the stall, the disturbance rotation speed increases while the size rapidly decreases. When the speed ratio equals to 1.333, the stall disturbance is fixed at a certain position in the circumferential direction, occupying a circumferential range of about 225° and penetrating both the front and rear rotors almost simultaneously. When the stall recovers, the disturbance decays rapidly in 1 s till complete disappearance.
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