Practical observations of the nonreturn valve wear in aero-engine cabin-bleed systems suggest that such valves are subject to unstable behavior. A theoretical model for the prediction of nonreturn valve instabilities in air systems is proposed and a nonlinear state-space model of the nonreturn valve and air volume interaction is derived from first principles. Experimental work is used to identify both the dynamic characteristics and the flow properties of the valve, which are used to identify the coefficients within the model. Through frequency analysis of valve oscillatory behavior, the levels of damping within the system are identified. Finally, using a local linearization of the state-space model an explicit mathematical prediction of valve stability is derived based on system parameters. These predictions are used to generate a map of the transition from stable to unstable system behavior for low-speed air flow, which is in excellent agreement with experimental data.
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December 2008
Research Papers
Instabilities of Nonreturn Valves in Low-Speed Air Systems
Mark Potter,
Mark Potter
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
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Marko Bacic,
Marko Bacic
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
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Phil Ligrani,
Phil Ligrani
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
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Matthew Plackett
Matthew Plackett
Hardware Engineering-Fleet Controls,
Rolls Royce PLC
, P.O. Box 31, Derby DE24 8BJ, UK
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Mark Potter
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
Marko Bacic
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
Phil Ligrani
Department of Engineering Science,
University of Oxford
, Parks Road, Oxford OX1 3PJ, UK
Matthew Plackett
Hardware Engineering-Fleet Controls,
Rolls Royce PLC
, P.O. Box 31, Derby DE24 8BJ, UKJ. Fluids Eng. Dec 2008, 130(12): 121105 (8 pages)
Published Online: October 27, 2008
Article history
Received:
September 24, 2007
Revised:
March 25, 2008
Published:
October 27, 2008
Citation
Potter, M., Bacic, M., Ligrani, P., and Plackett, M. (October 27, 2008). "Instabilities of Nonreturn Valves in Low-Speed Air Systems." ASME. J. Fluids Eng. December 2008; 130(12): 121105. https://doi.org/10.1115/1.2969746
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