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Numerical Simulation of Turbulent Flows Through Turbine Cascade With Rough Blades
Fürst, J. ; Louda, Petr ; Příhoda, Jaromír
The article deals with numerical simulation of turbulent compressible flows through 2D model of a turbine with rough blades. The mathematical model is based on the Favre-averaged Navier-Stokes equations combined with several two-equations turbulence models. The wall roughness is modeled using an appropriate boundary condition for specific dissipation rate. The comparison with experimental data shows correct increase of energy losses in the case of increased wall roughness.
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Numerical experiments modelling turbulent flows
Trefilík, Jiří ; Kozel, Karel ; Příhoda, Jaromír
The paper deals with modification of the transition model with the algebraic equation for the intermittency coefficient proposed originally by Straka and Příhoda (2010) for the bypass transition for modelling of the transition at low free-stream turbulence. The modification is carried out using accessible experimental data for the flat-plate flow. Further, the three-equation k-kL-omega model proposed by Walters and Cokljat (2008) was used for the modelling of the transition at low free-stream turbulence. Both models were tested by means of the incompressible flow around airfoils at moderate and very low free-stream turbulence.
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Modelling of natural and bypass transition in aerodynamics
Fürst, J. ; Straka, P. ; Příhoda, Jaromír
The paper deals with modification of the transition model with the algebraic equation for the intermittency coefficient proposed originally by Straka and Příhoda (2010) for the bypass transition for modelling of the transition at low free-stream turbulence. The modification is carried out using accessible experimental data for the flat-plate flow. Further, the three-equation k-kL-omega model proposed by Walters and Cokljat (2008) was used for the modelling of the transition at low free-stream turbulence. Both models were tested by means of the incompressible flow around airfoils at moderate and very low free-stream turbulence.
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Modelling of the boundary-layer transition in the low-pressure turbine blade cascade
Straka, P. ; Příhoda, Jaromír
The paper deals with the application of a algebraic model of the bypass transition in attached and separated flow. The model was applied for flow in a low-pressure turbine blade cascade, where the flow field is strongly influenced by the transition in the separated flow. The aim is to points out some shortcomings of the current transition model and its modifications are proposed. Presented results of modelling are compared with the experimental data.
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On Parameters of Shock Waves in Saturated Steam
Nový, A. ; Jícha, D. ; Šafařík, Pavel ; Hajšman, M.
The paper deals with theoretical and numerical study of shock wave parameters in saturated steam. Theoretical approach is based on mass, momentum and energy balance equations. An iterative procedure for solution of state parameters is derived. Numerical solution of steam parameters is performed by means of the iterative procedure using the IAPWS-IF97 water and steam thermodynamic properties. Results are presented and compared with results obtained from ideal gas theory.
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