The midspan section of a low speed subsonic turbine stage that is built and tested at DFVLR, Cologne, is redesigned using a new inverse blade design method, where the blade walls move with a virtual velocity distribution derived from the difference between the current and target pressure distributions on the blade surfaces. This new inverse method is fully consistent with the viscous flow assumption and is implemented into the time-accurate solution of the Reynolds-averaged Navier–Stokes equations. An algebraic Baldwin–Lomax turbulence model is used for turbulence closure. The mixing plane approach is used to couple the stator and rotor regions. The computational fluid dynamics (CFD) analysis formulation is first assessed against the turbine stage experimental data. The inverse formulation that is implemented in the same CFD code is assessed for its robustness and merits. The inverse design method is then used to study the effect of the rotor pressure loading on the blade shape and stage performance. It is also used to simultaneously redesign both stator and rotor blades for improved stage performance. The results show that by carefully tailoring the target pressure loading on both blade rows, improvement can be achieved in the stage performance.
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e-mail: b_roidl@encs.concordia.ca
e-mail: ghaly@encs.concordia.ca
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January 2011
Research Papers
Redesign of a Low Speed Turbine Stage Using a New Viscous Inverse Design Method
Benedikt Roidl,
Benedikt Roidl
Department of Mechanical and Industrial Engineering,
e-mail: b_roidl@encs.concordia.ca
Concordia University
, 1455 de Maisonneuve, West, Montreal, QC H3G 1M8, Canada
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Wahid Ghaly
Wahid Ghaly
Department of Mechanical and Industrial Engineering,
e-mail: ghaly@encs.concordia.ca
Concordia University
, 1455 de Maisonneuve, West, Montreal, QC H3G 1M8, Canada
Search for other works by this author on:
Benedikt Roidl
Department of Mechanical and Industrial Engineering,
Concordia University
, 1455 de Maisonneuve, West, Montreal, QC H3G 1M8, Canadae-mail: b_roidl@encs.concordia.ca
Wahid Ghaly
Department of Mechanical and Industrial Engineering,
Concordia University
, 1455 de Maisonneuve, West, Montreal, QC H3G 1M8, Canadae-mail: ghaly@encs.concordia.ca
J. Turbomach. Jan 2011, 133(1): 011009 (9 pages)
Published Online: September 9, 2010
Article history
Received:
August 28, 2008
Revised:
February 10, 2009
Online:
September 9, 2010
Published:
September 9, 2010
Citation
Roidl, B., and Ghaly, W. (September 9, 2010). "Redesign of a Low Speed Turbine Stage Using a New Viscous Inverse Design Method." ASME. J. Turbomach. January 2011; 133(1): 011009. https://doi.org/10.1115/1.4000491
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