INVESTIGATION OF BLADE TIP INTERACTION WITH CASING TREATMENT IN A TRANSONIC COMPRESSOR – PART 2: NUMERICAL RESULTS
Schnell, Rainer and Voges, Melanie and Mönig, Reinhard and Müller, Martin W. and Zscherp, Carsten (2011) INVESTIGATION OF BLADE TIP INTERACTION WITH CASING TREATMENT IN A TRANSONIC COMPRESSOR – PART 2: NUMERICAL RESULTS. Journal of Turbomachinery, Vol. 133 (Issue 1). Transaction of the ASME. ISSN 0889-504X.
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A single-stage transonic axial compressor was equipped with a casing treatment, consisting of 3.5 axial slots per rotor pitch in order to investigate its influence on stall margin characteristics as well as on the rotor near tip flowfield both numerically and experimentally. Contrary to most other studies a generic Casing Treatment was designed to provide optimal optical access in the immediate vicinity of the CT, rather than for maximum benefit in terms of stall margin extension. The second part of this two-part paper deals with the numerical developments, and their validation, carried out in order to efficiently perform time-accurate casing-treatment simulations. The numerical developments focus on the extension of an existing coupling algorithm in order to carry out unsteady calculations with any exterior geometry coupled to the main flow passage (in this case a single slot) having an arbitrary pitch. This extension is done by incorporating frequency domain, phase-lagged boundary conditions into this coupling procedure. Whereas the phaselag approach itself is well established and validated for standard rotor-stator calculations, its application to casing treatment simulations is new. Its capabilities and validation will be demonstrated on the given compressor configuration, making extensive use of the detailed PIV flowfield measurements near the rotor tip. Instantaneous data at all measurement planes will be compared for different rotor positions with respect to the stationary slots in order to evaluate the time-dependent interaction between the rotor and the casing treatment.
|Title:||INVESTIGATION OF BLADE TIP INTERACTION WITH CASING TREATMENT IN A TRANSONIC COMPRESSOR – PART 2: NUMERICAL RESULTS|
|Journal or Publication Title:||Journal of Turbomachinery|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Publisher:||Transaction of the ASME|
|Keywords:||TRACE, CFD, PIV, casing treatment, transonic, compressor, code validation|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L ER - Engine Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ER - Engine Research|
|DLR - Research theme (Project):||L - Virtual Engine and Validation Methods|
|Institutes and Institutions:||Institute of Propulsion Technology > Numerical Methodes|
Institute of Propulsion Technology > Engine Measurement Systems
|Deposited By:||Melanie Voges|
|Deposited On:||15 Feb 2011 14:11|
|Last Modified:||04 Apr 2013 16:28|
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