The design space of axial-flow compressors is restricted by stability issues. Different axial-type casing treatments (CTs) have shown their ability to enhance compressor stability and to influence efficiency. Casing treatments have proven to be effective, but there still is need for more detailed investigations and gain of understanding for the underlying flow mechanism. Casing treatments are known to have a multitude of effects on the near-casing 3D flow field. For transonic compressor rotors, these are more complex, as super- and subsonic flow regions alternate while interacting with the casing treatment. To derive design rules, it is important to quantify the influence of the casing treatment on the different tip flow phenomena. Designing a casing treatment in a way that it antagonizes only the deteriorating secondary flow effects can be seen as a method to enhance stability while increasing efficiency. The numerical studies are carried out on a tip-critical rotor of a 1.5-stage transonic axial compressor. The examined recirculating tip blowing casing treatment (TBCT) consists of a recirculating channel with an air off-take above the rotor and an injection nozzle in front of the rotor. The design and functioning of the casing treatment are influenced by various parameters. A variation of the geometry of the tip blowing, more specifically the nozzle aspect ratio, the axial position, or the tangential orientation of the injection port, was carried out to identify key levers. The tip blowing casing treatment is defined as a parameterized geometric model and is automatically meshed. A sensitivity analysis of the respective design parameters of the tip blowing is carried out on a single rotor row. Their impact on overall efficiency and their ability to improve stall margin are evaluated. The study is carried out using unsteady Reynolds-averaged Navier–Stokes (URANS) simulations.
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February 2017
Research-Article
Influencing Parameters of Tip Blowing Interacting With Rotor Tip Flow
Cyril Guinet,
Cyril Guinet
Institute for Turbomachinery and
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
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André Inzenhofer,
André Inzenhofer
Institute for Turbomachinery and
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
e-mail: a.inzenhofer@tum.de
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
e-mail: a.inzenhofer@tum.de
Search for other works by this author on:
Volker Gümmer
Volker Gümmer
Institute for Turbomachinery and
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
Search for other works by this author on:
Cyril Guinet
Institute for Turbomachinery and
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
André Inzenhofer
Institute for Turbomachinery and
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
e-mail: a.inzenhofer@tum.de
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
e-mail: a.inzenhofer@tum.de
Volker Gümmer
Institute for Turbomachinery and
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
Flight Propulsion,
Technische Universität München,
Boltzmannstr. 15,
Garching 85748, Germany
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received May 26, 2016; final manuscript received July 26, 2016; published online October 26, 2016. Editor: Kenneth Hall.
J. Turbomach. Feb 2017, 139(2): 021010 (10 pages)
Published Online: October 26, 2016
Article history
Received:
May 26, 2016
Revised:
July 26, 2016
Citation
Guinet, C., Inzenhofer, A., and Gümmer, V. (October 26, 2016). "Influencing Parameters of Tip Blowing Interacting With Rotor Tip Flow." ASME. J. Turbomach. February 2017; 139(2): 021010. https://doi.org/10.1115/1.4034699
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