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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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Measurements of 3D Flow Field Behind the Blade Cascade SE 1050
Šimurda, David ; Luxa, Martin
The paper is concerned with measurements of 3D flow field at exit of the Blade Cascade SE1050. Data was collected using traversing device with a small five-hole conical probe. Prior to measurements of the flow exiting the blade cascade, investigations of inlet velocity profile and inlet turbulence intensity were conducted. Measurements of exit flow field were performed at design angle of incidence and at a transonic and a subsonic regime. Data analysis reveals development of distinctive vortex structures resulting from non-uniform inlet velocity profile. Origin of these structures results in increased loss of kinetic energy and spanwise shift of kinetic energy loss coefficient distribution.
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Span-Wise Distribution of Losses in Prismatic Turbine Cascade
Fürst, J. ; Luxa, Martin ; Šimurda, David
The paper deals with the experimental and numerical research of flows through prismatic turbine cascade in transonic regimes. The primary goal is to evaluate the influence of the non-uniformity of the inlet velocity profile to the spanwise distribution of energy losses. The numerical simulation with inlet velocity profile corresponding to the parameters of the flow in high speed wind tunnel in Nov´y Kn´ın is compared to the experimental data. Next, the simulation assuming different inlet velocity profiles are used to evaluate the effect of the boundary layer in front of the cascade to the span-wise distribution of energy losses.
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Numerical experiments for turbulent flows
Trefilík, Jiří ; Kozel, Karel ; Příhoda, J.
The aim of the work is to explorethe possibilities of modelling transonic flowsin the internal and external aerodynamics. Several konfigurationswere analyzed and calculations were performed using both inviscid and viscous models of flow. Viscous turbulent flows have been simulated using either zero equation algebraic Baldwin-Lomax model and two equation k - w model in its basic version and improved TNT variant. The numerical solution was obtained using Lax-Wendroff scheme in the MAcCormack from on structured non-ortogonal grids. Artificial dissipation was added to improve the numerical stability. Achieved results are compared with experimental data.
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