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Měření na turbínové mříži
Vondra, Marek ; Pospíšil, Jiří (oponent) ; Fiedler, Jan (vedoucí práce)
Cílem této diplomové práce je měření na turbínové mříži. V první části se jedná o měření charakteristik proudění za turbínovou mříží pomocí tříotvorové pneumatické sondy, ve druhé části pak měření tlaku po profilu lopatky. Obě měření jsou provedena jak experimentálně, tak pomocí počítačové simulace v programu Ansys a výsledky jsou vzájemně porovnány. Součástí práce je soubor, obsahující počítačovou simulaci provedenou v programu CFX.
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Measurements on Turbine Cascade KOBRA
Luxa, Martin ; Hála, Jindřich ; Šimurda, David
The report contains results and evaluation of aerodynamic measurement on a blade cascade representing the section imitating the conical stream line in the last rotor row of a gas trubine under considerable off-design condition. The research report contains detailed specifications of the measured model, overview of the results of the optical measurements (interferometry, schlieren method in Toepler configuration) and pneumatic measurements (traversing with five hole conical probe downstream the cascade).
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Effect of Various Boundary Conditions on the Supersonic Flow Through the Tip-Section Turbine Blade Cascade with a Flat Profile
Musil, Josef ; Příhoda, Jaromír ; Fürst, J.
The paper deals with the numerical simulation of 2D compressible flow though the tip-section turbine blade cascade with a flat profile. The OpenFOAM code was used for simulations based on the Favre-averaged Navier-Stokes equations completed by the two-equation SST turbulence model and the gama-Re_th transition model proposed by Langtry and Menter (2009). Calculations were carried out for two nominal regimes with the inlet Mach number M1 = 1.2 and isentropic outlet Mach numbers M2is = 1.7 and 1.9. Simulations of compressible flow with the supersonic inlet were focused on the relation between of the inlet Mach number and the inlet angle given by the unique incidence rule. Further, the effect of the inlet free-stream turbulence and of the outlet isentropic Mach number on the flow filed in the blade cascade was investigated. Numerical results were compared with results of optical and pressure measurements.
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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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Transition Modelling on Separated Flow in Turbine Cascade
Louda, Petr ; Příhoda, Jaromír ; Kozel, K.
The work deals with numerical simulation of turbulent ow through turbine cascade by RANS model with model of transition to turbulence. Performance of two transition models is compared. First one is gamma-zeta model based on transition criteria, second one algebraic transition model based on the concept of laminar uctuations energy (Kubacki, Dick 2016). The criterion for transition in separated state is re-formulated in order to remove stream-wise non-local formulation. The performance of the transition models is observed on the shock wave - boundary layer interaction on turbine blade.
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Some results of simulations of flows with internal permeable walls
Louda, Petr
The work deals with the numerical modelling of compressible flow in a domain containing permeable walls in its interior, i.e. submerged in the fluid. The aim is to exclude direct simulation and find a model approximating the flow through a permeable plate driven by the static pressure difference between the sides of the wall. The numerical experiments so far enable to understand better forming of parasitic wave structures in the measuring section of the wind tunnel. The model of permeable wall needs further verification.
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Měření na turbínové mříži
Vondra, Marek ; Pospíšil, Jiří (oponent) ; Fiedler, Jan (vedoucí práce)
Cílem této diplomové práce je měření na turbínové mříži. V první části se jedná o měření charakteristik proudění za turbínovou mříží pomocí tříotvorové pneumatické sondy, ve druhé části pak měření tlaku po profilu lopatky. Obě měření jsou provedena jak experimentálně, tak pomocí počítačové simulace v programu Ansys a výsledky jsou vzájemně porovnány. Součástí práce je soubor, obsahující počítačovou simulaci provedenou v programu CFX.
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