Steady blowing vortex generating jets (VGJ) on highly-loaded low-pressure turbine profiles have shown to be a promising way to decrease total pressure losses at low Reynolds-numbers by reducing laminar separation. In the present paper, the state of the art turbomachinery design code TRACE with RANS turbulence closure and coupled transition model is applied to the prediction of typical aerodynamic design parameters of various VGJ configurations in steady simulations. High-speed cascade wind tunnel experiments for a wide range of Reynolds-numbers, two VGJ positions, and three jet blowing ratios are used for validation. Since the original transition model overpredicts separation and losses at , an extra mode for VGJ induced transition is introduced. Whereas the criterion for transition is modeled by a filtered Q vortex criterion the transition development itself is modeled by a reduction of the local transition-onset momentum-thickness Reynolds number. The new model significantly improves the quality of the computational results by capturing the corresponding local transition process in a physically reasonable way. This is shown to yield an improved quantitative prediction of surface pressure distributions and total pressure losses.
Transition Modeling for Vortex Generating Jets on Low-Pressure Turbine Profiles
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 29, 2011; final manuscript received August 10, 2011; published online October 31, 2012. Editor: David Wisler.
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Herbst, F., Kožulović, D., and Seume, J. R. (October 31, 2012). "Transition Modeling for Vortex Generating Jets on Low-Pressure Turbine Profiles." ASME. J. Turbomach. January 2013; 135(1): 011038. https://doi.org/10.1115/1.4006421
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