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XXIV Biennial Symposium on Measuring Techniques in Turbomachinery
Šimurda, David
Aim of the symposium is to bring together researchers from the field of experimental research in turbomachines who can share and are interested in experience with the development of new experimental measurement techniques, new techniques for monitoring engine operation and performance, and application of new analysis techniques to experimental data.
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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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Technique for Determination of Phase Changes in Moist Air Flowin a Blade Cascade
Vestfálová, M. ; Šafařík, P. ; Šimurda, David
The paper deals with theoretical and numerical tool for prediction of phase changes in moist air flow in flow systems. Partially solidified or liquidized steam in moist air appears to be a problem for peration wind tunnels, turbomachines, etc. Determination of phase change conditions is based on thermodynamic theory. Parameters of saturated homogeneous moist air are solved when expansion process is simulated at calculations. Conditions of saturation are successively verified and finally determined. Special phase diagram for moist air is designed.
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