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Original title:
Investigation of Vstol Aircraft Engine Surge Due to Ground Vortex Ingestion
Authors: Lepičovský, Jan ; duPont, A. A.
Document type: Papers
Conference/Event: Biennial Symposium on Measuring Techniques in Turbomachinery /24./, Praha (CZ), 20180829
Year: 2018
Language: eng
Abstract: 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.
Keywords: engine surge; ground vortex; vortex ingestion; VSTOL aircraft
Project no.: TH02020057 (CEP)
Funding provider: GA TA ČR
Host item entry: Proceedings of XXIV Biennial Symposium on Measuring Techniques in Turbomachinery, ISBN 978-80-87012-68-0
Note: Související webová stránka: http://www.meastechturbo.com/index.php/paper-archives/2418-prague-2018/item/download/452_71b3d0e61cbf8892a45e83f1f9168380
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0293070
Permalink: http://www.nusl.cz/ntk/nusl-391496
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Lepičovský, Jan ; duPont, A. A.
Document type: Papers
Conference/Event: Biennial Symposium on Measuring Techniques in Turbomachinery /24./, Praha (CZ), 20180829
Year: 2018
Language: eng
Abstract: 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.
Keywords: engine surge; ground vortex; vortex ingestion; VSTOL aircraft
Project no.: TH02020057 (CEP)
Funding provider: GA TA ČR
Host item entry: Proceedings of XXIV Biennial Symposium on Measuring Techniques in Turbomachinery, ISBN 978-80-87012-68-0
Note: Související webová stránka: http://www.meastechturbo.com/index.php/paper-archives/2418-prague-2018/item/download/452_71b3d0e61cbf8892a45e83f1f9168380
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0293070
Permalink: http://www.nusl.cz/ntk/nusl-391496
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2019-02-13, last modified 2021-11-24