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Numerical Optimization of a Stall Margin Enhancing Recirculation Channel for an Axial Compressor

1
Japanese Acquisition Technology & Logistics Agency, Ministry of Defense, Tokyo 190-8533, Japan
2
Department of Engineering, University of Leicester, Leicester LE1 7RH, UK
*
Author to whom correspondence should be addressed.
Fluids 2019, 4(2), 88; https://doi.org/10.3390/fluids4020088
Received: 13 February 2019 / Revised: 22 March 2019 / Accepted: 26 April 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Turbomachinery Flow Analysis)
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Abstract

A proof of concept is provided by computational fluid dynamic simulations of a new recirculating type casing treatment. This treatment aims at extending the stable operating range of highly loaded axial compressors, so to improve the safety of sorties of high-speed, high-performance aircraft powered by high specific thrust engines. This casing treatment, featuring an axisymmetric recirculation channel, is evaluated on the NASA rotor 37 test case by steady and unsteady Reynolds Averaged Navier Stokes (RANS) simulations, using the realizable k-ε model. Flow blockage at the recirculation channel outlet was mitigated by chamfering the exit of the recirculation channel inner wall. The channel axial location from the rotor blade tip leading edge was optimized parametrically over the range −4.6% to 47.6% of the rotor tip axial chord c z . Locating the channel at 18.2% c z provided the best stall margin gain of approximately 5.5% compared to the untreated rotor. No rotor adiabatic efficiency was lost by the application of this casing treatment. The investigation into the flow structure with the recirculating channel gave a good insight into how the new casing treatment generates this benefit. The combination of stall margin gain at no rotor adiabatic efficiency loss makes this design attractive for applications to high-speed gas turbine engines. View Full-Text
Keywords: computational fluid dynamics; axial compressor; stall inception; casing treatment; parameter optimization computational fluid dynamics; axial compressor; stall inception; casing treatment; parameter optimization
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Kawase, M.; Rona, A. Numerical Optimization of a Stall Margin Enhancing Recirculation Channel for an Axial Compressor. Fluids 2019, 4, 88.

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