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Energies 2017, 10(8), 1153; doi:10.3390/en10081153

Numerical Investigation for the Impact of Single Groove on the Stall Margin Improvement and the Unsteadiness of Tip Leakage Flow in a Counter-Rotating Axial Flow Compressor

School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
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Received: 28 June 2017 / Revised: 19 July 2017 / Accepted: 20 July 2017 / Published: 7 August 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

A low-speed counter-rotating axial flow compressor (CRAC) with single circumferential grooved casing treatment (CT) was investigated numerically. Both steady and time-accurate numerical calculations were performed to study the effects of the single grooved CTs over the rear rotor on the stability enhancement and the unsteadiness of tip leakage flow (TLF) in the CRAC. Parametric studies indicate that the best position of the single groove should be located near about 20% axial tip chord in terms of the stall margin improvement (SMI). The coincidence of the effective CT locations and the high fluctuating region on blade pressure surface in the smooth wall case shows that the unsteadiness of TLF plays an important role in the stall inception process. Frequency analysis for the static pressure signals near the blade tip shows that both the disappearance of the low frequency components and the suppression of unsteady TLF are beneficial to the SMI. Detailed observation of the flow structures illustrates that the action of the grooves on the different parts of TLF is responsible for the difference of SMI in the CTs. It is more effective to improve the flow stability by controlling the critical TLF released from near the mid-chord. View Full-Text
Keywords: counter-rotating; casing treatment; tip clearance flow; frequency analysis counter-rotating; casing treatment; tip clearance flow; frequency analysis
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Mao, X.; Liu, B.; Zhao, H. Numerical Investigation for the Impact of Single Groove on the Stall Margin Improvement and the Unsteadiness of Tip Leakage Flow in a Counter-Rotating Axial Flow Compressor. Energies 2017, 10, 1153.

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