低速轴流压气机周向单槽机匣处理扩稳实验研究

doi:10.7527/S1000-6893.2014.0131

Abstract

Abstract:

Circumferential casing grooves are known to increase the stable operating range of axial compressors; however, the mechanism by which the stability enhancement occurs is poorly understood. In this paper, experimental investigations are performed on a low speed axial compressor to study the stability enhancement effect of single circumferential casing groove with different axial locations. The complete change rule of stability enmancement improvement is obtained when the groove moves from the leading edge towards trailing edge. It is found that the optimum grooves locate at the location of 40% to 60% of axial chord of the blade tip, and the worst grooves locate near the location of 27% of axial chord of the blade tip. On this basis, dynamic measurements are performed on the casing and at the rotor wake to analyze the effect on the tip leakage flow and rotor wake with different groove locations compared with smooth casing. These results reveal that the optimum groove can delay the forward movement of the interface and it can also enhance the power of frequency band of blade passing frequency (BPF) and weaken the power of 0.5BPF. But for the worst groove, the interface cannot cross the groove to spill out at the leading edge, even until the stall; it will affect the circumferential propagation of the disturbance which induced the stall inception. Its effect on the power of 1BPF and 0.5BPF at the rotor wake is very slightly.

Key words: compressor, single circumferential groove, casing treatment, wake, stall margin improvement

CLC Number:

V231.3

LI Jichao, LIU Le, DU Juan, WANG Sichen, LIN Feng. Experimental investigation of stability enhancement with single circumferential groove casing treatment on a low speed axial compressor[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(5): 1422-1431.

References

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Experimental investigation of stability enhancement with single circumferential groove casing treatment on a low speed axial compressor

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