Effect of Circumferential Single Casing Groove Location on the Flow Stability under Tip-Clearance Effect in a Transonic Axial Flow Compressor Rotor

Xiaoxiong Wu, Bo Liu, Botao Zhang and Xiaochen Mao
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Xiaoxiong Wu: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Bo Liu: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Botao Zhang: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Xiaochen Mao: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China

Energies, 2021, vol. 14, issue 19, 1-20

Abstract: Numerical simulations have been performed to study the effect of the circumferential single-grooved casing treatment (CT) at multiple locations on the tip-flow stability and the corresponding control mechanism at three tip-clearance-size (TCS) schemes in a transonic axial flow compressor rotor. The results show that the CT is more efficient when its groove is located from 10% to 40% tip axial chord, and G2 (located at near 20% tip axial chord) is the best CT scheme in terms of stall-margin improvement for the three TCS schemes. For effective CTs, the tip-leakage-flow (TLF) intensity, entropy generation and tip-flow blockage are reduced, which makes the interface between TLF and mainstream move downstream. A quantitative analysis of the relative inlet flow angle indicates that the reduction of flow incidence angle is not necessary to improve the flow stability for this transonic rotor. The control mechanism may be different for different TCS schemes due to the distinction of the stall inception process. For a better application of CT, the blade tip profile should be further modified by using an optimization method to adjust the shock position and strength during the design of a more efficient CT.

Keywords: transonic axial flow compressor; grooved casing treatment; tip-leakage flow; stall margin; flow stability (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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