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Simulation of Transonic Flow Through a Mid-span Turbine Blade Cascade for Various Mach Numbers
Straka, P. ; Příhoda, Jaromír ; Fenderl, D.
The contribution deals with the numerical simulation of 2D transonic flow through a mid-span turbine blade cascade for several Mach numbers by means of the EARSM turbulence model of Hellsten (2004) connected with the algebraic bypass transition model of Straka and Příhoda (2014). Both models are implemented into an in-house numerical code based on the finite volume method. The gamma-transition model of Menter et al. (2015) with SST turbulence model accessible in the commercial code ANSYS Fluent was used for the comparison.
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Simulation of Transonic Flow Through a Mid-Span Turbine Blade Cascade with the Separation-Induced Transition
Straka, P. ; Příhoda, Jaromír ; Fenderl, D.
The paper deals with the numerical simulation of the transonic flow through a mid-span turbine blade cascade by means of an in-house code based on the EARSM turbulence model of Hellsten [1] completed by the algebraic transition model of Straka and Příhoda [2]. The simulation using the transition model of Langtry and Menter [3] and Menter et al. [4] implemented in the commercial code ANSYS Fluent was used for the comparison. Simulations were carried out for the transonic regime close to the nominal regime. The flow separation on the suction side of the blade is caused by the interaction of the reflected shock wave with the boundary layer. The attention was focused on the modelling of the transition in the separated flow especially on the modelling of the length of the transition region. Numerical results were compared with experimental results.
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Optical measurements on TR-P-4 cascade
Luxa, Martin ; Šimurda, David
Report contains results and analysis of optical measurements (interferometry and schlieren photography) on the on the optimised variant of the hub section of the ultra long rotor blade for the last stage of a large output steam turbine. Internal designation of the cascade is TR-P-4.
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Simulace proudění špičkovým řezem turbinové mříže při různých vstupních podmínkách
Straka, P. ; Příhoda, Jaromír
Příspěvek se zabývá numerickou simulací 2D stlačitelného proudění špičkovým řezem turbinové lopatkové mříže pomocí EARSM modelu turbulence doplněného algebraickým modelem přechodu. Výpočty byly provedeny při Reynoldsově čísle Re2is = 1.85E+06 pro Machova čísla M2is = 1.77 a 1.92. Simulace byla zaměřena na vliv malých změn vstupního úhlu proudu a změn turbulence vnějšího proudu na strukturu proudění v lopatkové mříži, zejména na interakci rázových vln s mezní vrstvou.
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Modelling of the Laminar/Turbulenttransition on a Heated Flat Plate Using the k-kL-w Model
Kožíšek, Martin ; Fürst, J. ; Příhoda, Jaromír
The contribution deals with the numerical simulation of the transition to turbulence on a heated flat plate by means of the k-kL-k-kL-w model of Walters and Cokljat (2008). The revised version of the three-equation model was implemented into the OpenFOAM code for the incompressible and compressible flows. Numerical simulations of the boundary-layer development were carried out according to measurements of Sohn and Reshotko (1991). The transition model was tested by means of the skin friction and the Stanton number distributions for various free-stream turbulence levels. Results were compared with empirical correlations expressing the Reynolds analogy according to Kays and Crawford (1993) and with experimental data of Pinson and Wang (2000).
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