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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Numerical simulation of dynamic loading of a test blade in forced torsional vibration
 Šidlof, P. ; Vomáčko, V. ; Lepičovský, Jan ; Šimurda, David ; Štěpán, M. ; Luxa, Martin
Within a new project focused on blade flutter research, building on previous experience with the NASA Transonic Flutter Cascade facility, static blade cascade and airfoil flutter experiments realized in cooperation between the Institute of Thermomechanics and Technical University of Liberec, a new test facility is under development for the investigation of high subsonic and transonic flow in a blade cascade under forced torsional oscillation. Apart from aerodynamic loading of the blades, the oscillating blade will be exposed to significant structural stresses due to the highfrequency torsional vibration. In order to avoid structural integrity issues from high-cycle fatigue, a numerical simulation of the stress and displacement of the blade was realized. Regions where equivalent stress reaches maximum values were identified, and elastic deformations were computed. The limits in oscillation amplitude and frequency for the safe operation of the experimental setup were discussed.
Úplný záznam
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.
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