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Aerodynamics tests of a transonic turbine blade cascade model consisting of low number of blades
Šimurda, David ; Luxa, Martin ; Šafařík, Pavel ; Synáč, J.
Contribution is concerned with experimental investigation of the transonic turbine blade cascade aerodynamic characteristics. Due to specific geometry of the blade cascade, the blade cascade model consists of six blades only. Therefore, special experimental setup is adopted and its influence on the resultant blade cascade aerodynamic characteristics is discussed. Experimental data are obtained applying both optical (interferometry, schlieren technique) and pneumatic methods (mainly traversing with a five-hole conical probe). Special attention is paid to flow structures, which significantly contribute to the increase of kinetic energy loss coefficient. Results of current investigation are compared to former results obtained at usual experimental set-up.
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Experimental simulation of inviscid and viscous turbulent transonic flows
Trefilík, Jiří ; Kozel, K. ; Příhoda, Jaromír
The work deals with the development of numerical methods for simulation of transonic turbulent flows through the DCA 8% cascade and over the 18% thick circular arc biconvex airfoil. Results of numerical experiments modelling the viscous and inviscid flows in the cascade with the inlet Mach numbers M = 0.87 and 0.96 and over the airfoil with M =0.775 are compared and discussed. The two-equation k-omega model and the algebraic Baldwin-Lomax model were employed for turbulence modelling and their numerical results were compared.
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Experimental Data on High-Speed Flow Past the Root Blade Cascade
Šimurda, David ; Luxa, Martin ; Synáč, J. ; Šafařík, P.
The paper deals with experimental results of high-speed aerodynamic research on a blade cascade. The blade cascade represents root section of the last stage rotor blades of large output steam turbine. Basic aerodynamic characteristics of the blade cascade are presented together with photographs of flow fields in the range of transonic flow regimes. Results are analysed and discussed to provide a new knowledge on design and operation of the last rotor at the region of the blade root.
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Numerical simulation of external and internal transonic flows
Huml, J. ; Kozel, K. ; Příhoda, Jaromír
This work deals with the numerical solution of transonic flows of an inviscid compressible fluid in a two- and three-dimensional channel and in a two-dimensional DCA 8% cascade. The numerical solution was obtained by the finite volume method using the multistage Runge-Kutta method and Lax-Wendroff scheme on structured non-orthogonal grids. Jameson's artificial dissipation was added to increase of the numerical stability.
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