A Passive Control Method of Hub Corner Stall in a 1.5-Stage Axial Compressor under Low-Speed Conditions

Wenfeng Zhao, Qun Zheng, Bin Jiang and Aqiang Lin
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Wenfeng Zhao: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Qun Zheng: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Bin Jiang: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
Aqiang Lin: College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China

Energies, 2020, vol. 13, issue 11, 1-17

Abstract: Since the use of the compressor of a ship gas turbine is unavoidable at a low-speed operation, the flow field characteristics and stall mechanism at off-design speeds are important aspects for compressor designers. In this study, the first 1.5 stages of an eight-stage compressor are numerically simulated. The mechanism of compressor rotor instability at lower speeds is identified. The characteristic lines of compressors with various partial clearance are calculated at low speed (0.6 N). The flow field of the same outlet pressure (near stall point of the original compressor without clearance) is compared and analyzed. The results show that, at the near stall point, the suction surface separation and backflow occur in the main flow of the rotor top. It develops along the blade span and finally blocks the flow passage of the rotor, which results in the compressor stall. At the same time, the stall also occurs at the corner of the stator hub. In this paper, the characteristics of partial clearance in four different positions of the stator hub are analyzed. The near stall point and the working point are selected for the flow field analysis. It is concluded that the radial development of the stall vortex on the suction surface of the stator can be restrained by the partial clearance at the stator. In this paper, a passive control method by partial clearance is used in the real compressors, which is different from previous studies on cascades. The margin increases at low speeds.

Keywords: compressor margin; off-design speed; partial clearance; hub corner stall (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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