Národní úložiště šedé literatury Nalezeno 14 záznamů.  předchozí11 - 14  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Simulation of Supersonic Flow Through the Tip-Section Turbine Blade Cascade with a Flat Profile
Musil, Josef ; Příhoda, Jaromír ; Fürst, J.
The contribution presents results of the numerical simulation of 2D compressible flow through the tip-section turbine blade cascade with a flat profile and the supersonic inlet. The simulation was carried out by the OpenFOAM code using the Favre-averaged NavierStokes equations completed by the two-equation SST turbulence model and the γ-Reθ bypass transition model. Predictions carried out for nominal conditions were focused particularly on the relation between the inlet flow angle and the inlet Mach number. Further, the effect of the shock-wave/boundary layer interaction on the skin friction coefficient was investigated. Numerical results were compared with experimental data.
Měření na profilu NACA 0010-64
Luxa, Martin ; Hála, Jindřich
Zpráva se zabývá měřením transsonického proudění na symetrickém profilu s různou drsností jeho náběžné části. Při měření bylo využito pro zjišťování polohy přechodu mezní vrstvy metody interferometrické a též metody měření smykového tření žhaveným filmem.
Investigation of Vstol Aircraft Engine Surge Due to Ground Vortex Ingestion
Lepičovský, Jan ; duPont, A. A.
An investigation of flow instabilities in the inlet ducts of a two-engine vertical takeoff and landing aircraft DP-1C is described in this paper. The engines stalled during run ups while the aircraft was perated on the ground. These pop stalls occurred at relatively low power levels, sometimes as low as 60% of the engine full speed. The main focus of the paper is on instrumentation of the aircraft intake ducts and on high speed recording the flow instabilities during the engine rotating stall and surge events. The recorded data sets show the history of speeds of both engines and the associated history of pressure changes recorded by six pressure transducers installed in both inlet ducts. Analysis of recorded unsteady pressure data indicated that engine stalls were evoked by a sudden ingestion of a vortex generated between the two streams moving in the opposite directions: hot gas flow close to the ground streaming outbound from the main nozzle and inbound flow above in the engine inlets. The engine stall problem was eventually resolved by modifying the overall flow pattern at the engine intake lips by deploying a suitably shaped double scoop flow deflector.
Optical and Pneumatic Measurements on TR-U-8 Cascade
Luxa, Martin ; Šimurda, David
The report contains results and evaluation of conducted optical (interferometry and schlieren technique) and pneumatic measurements on a new variant of tip section, intended for long rotor blade.

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