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Analysis and Development of Compact Models for Mass Flows through Butterfly Throttle Valves
Technical Paper
2018-01-0876
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Throttles and wastegates are devices used in modern engines for accurate control of the gas flows. It is beneficial, for the control implementation, to have compact and accurate models that describe the flow behavior. The compressible isentropic restriction is a frequently used model, it is simple and reasonable accurate but it has some issues. One special issue is that it predicts that the choking occurs at too high pressure ratios, for example the isentropic model predicts choking at a pressure ratio of 0.52, while experimental data can have choking at 0.4 or even lower. In this work, experimental data is acquired from throttles tested both in a flow bench and mounted as main throttle on a turbocharged gasoline engine. To analyze the flow behavior several flow characterizations are performed at different throttle openings. For the engine installation a special test procedure is adopted and the results show that the engine and the flow bench give the same characteristic behavior of the throttle. In particular, both installations show choking pressure ratios that are significantly lower than what the compressible isentropic restriction predicts. To remedy this and capture the behavior, different modifications of the isentropic model are investigated. Some promising model modifications are analyzed; one that uses the conservation of momentum, energy, and mass to derive a compact expression for the mass flow, and another that uses an ellipse model. All modifications analyzed give lower pressure ratios at choking.
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Holmbom, R. and Eriksson, L., "Analysis and Development of Compact Models for Mass Flows through Butterfly Throttle Valves," SAE Technical Paper 2018-01-0876, 2018, https://doi.org/10.4271/2018-01-0876.Data Sets - Support Documents
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References
- Rani Kiwan , Anna G. Stefanopoulou , Jason Martz , Gopichandra Surnilla , Imtiaz Ali , and Daniel Joseph Styles Effects of differential pressure measurement characteristics on low pressure-egr estimation error in siengines**financial support was provided by the university of michigan and ford alliance IFAC-PapersOnLine 49 11 722 729 2016 2405-8963 10.1016/j.ifacol.2016.08.105
- Bruce Roy Munson , Donald F. Young , and Theodore Hisao Okiishi Fundamentals of fluid mechanics Bruce R. Munson , Donald F. Young , Theodore H. Okiishi Hoboken, N.J. Wiley 2006 0471675822
- A.L. Addy , M.J. Morris , and J.C. Dutton An Investigation of Compressible Flow Characteristics of Butterfly Valves Journal of Fluids Engineering, Transactions of the ASME 107 4 512 517 1985 1528901X
- Elbert Hendricks , Alain Chevalier , Michael Jensen , Spencer C. Sorenson , Dave Trumpy , and Joe Asik Modelling of the Intake Manifold Filling Dynamics SAE Technical Paper 960037 1996 10.4271/960037
- Andersson P. 2005
- Vilhelmsson C. 2017
- John B. Heywood Internal Combustion Engine Fundamentals McGraw-Hill series in mechanical engineering New York McGraw-Hill 1988 0-07-100499-8
- Tielong Shen and Akira Ohata 2011
- Eriksson , L. and Nielsen , L. Modeling and Control of Engines and Drivelines John Wiley & Sons 2014
- Leufven O. 2013