This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Impact of Dynamic Exhaust Valve Modelling
Technical Paper
2019-01-2346
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
A method developed in SAE 2019-01-0058 to correct for deviations from quasi-steady exhaust valve flow is implemented on a single-cylinder GT-Power model and the effects on pumping work and blowdown pulse characteristics are investigated. The valve flow area is always reduced compared to the reference quasi-steady case. It decreases with higher pressure ratios over the valve and increases with higher engines speeds. The reduced flow area increases pumping work with load and engine speed, though primarily with engine speed. The magnitude of the blowdown pulse is reduced and the peak is shifted to a later crank angle.
Authors
Topic
Citation
Holmberg, T., Cronhjort, A., and Stenlåås, O., "Impact of Dynamic Exhaust Valve Modelling," SAE Technical Paper 2019-01-2346, 2019, https://doi.org/10.4271/2019-01-2346.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Dale , A. , Watson , N. Vaneless Radial Turbocharger Turbine Performance I Mech E Conf. Publ. (Institution Mech. Eng. 65 76 1986
- Chen , H. , Hakeem , I. , and Martinez-Botas , R.F. Modelling of a turbocharger turbine under pulsating inlet conditions Proc. Inst. Mech. Eng. Part A J. Power Energy 210 5 397 408 1996 10.1243/PIME_PROC_1996_210_063_02
- Romagnoli , A. , Copeland , C.D. , Martinez-Botas , R. , Seiler , M. , Rajoo , S. , and Costall , A. Comparison Between the Steady Performance of Double-Entry and Twin-Entry Turbocharger Turbines J. Turbomach. 135 1 2012 10.1115/1.4006566
- Luján , J.M. , Galindo , J. , and Serrano , J.R. Efficiency Characterization of Centripetal Turbines under Pulsating Flow Conditions SAE Tech. Pap. 2001-01-0272 724 2001 10.4271/2001-01-0272
- Xu , H. Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads 2001 10.4271/2001-01-1308
- Woods , W.A. and Khan , S.R. An Experimental Study of Flow Through Poppet Valves Proc. Inst. Mech. Eng. 180 14 32 41 1965
- Blair , G.P. , Callender , E. , and Mackey , D. Maps of discharge coefficients for valves, ports and throttles SAE Tech. Pap. 2001-01-1798 2001 10.4271/2001-01-1798
- Holmberg , T. , Cronhjort , A. , and Stenlaas , O. Pressure Ratio Influence on Exhaust Valve Flow Coefficients SAE Tech. Pap. 2017-01-0530 2017 10.4271/2017-01-0530
- Winroth , P.M. , Ford , C.L. , and Alfredsson , P.H. On discharge from poppet valves: effects of pressure and system dynamics Exp. Fluids 59 2 2018 10.1007/s00348-017-2478-8
- Holmberg , T. Dynamic Exhaust Valve Flow 1-D Modelling during Blowdown Conditions SAE Tech. Pap. 2019-01-0058 2019
- Heywood , J.B. Internal Combustion Engine Fundamentals 0-07-100499-8 1988 10987654
- Möller , C.E. , Johansson , P. , Grandin , B. , and Lindström , F. Divided Exhaust Period - A Gas Exchange System for Turbocharged SI Engines 2005 724 2005 10.4271/2005-01-1150
- Gundmalm , S. , Cronhjort , A. , and Angstrom , H.-E. Divided Exhaust Period: Effects of Changing the Relation between Intake, Blow-Down and Scavenging Valve Area SAE Int. J. Engines 6 2 2013 10.4271/2013-01-0578