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Engine In-Cylinder Flow Control via Variable Intake Valve Timing
Technical Paper
2013-24-0055
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Stereoscopic particle-image velocimetry (PIV) is used to investigate the non-reacting flow field in the combustion chamber of a motored direct-injection spark ignition (DISI) engine with tumble intake port. The in-cylinder flow is controlled by variable valve timing (VVT), i.e., shifting of the intake cam shaft to earlier or later crank angles (cam phasing). VVT systems are already implemented in production combustion engines, e.g., BMW's Vanos system, to improve the volumetric efficiency and to reduce pumping losses. In the present study, the underlying flow phenomena, i.e., the effect of VVT on the tumble development and turbulent kinetic energy, are analyzed. The flow field is investigated at a set of early, intermediate, and late intake valve opening (IVO) positions during the intake and compression strokes, thus enabling the analysis of the temporal development of the main flow structures. Two parallel, vertical measurement planes, the symmetry plane and the valve plane, are investigated. It is shown that VVT has a strong influence on the mean vorticity and the local and temporal distribution of the kinetic energy and turbulent kinetic energy. The tumble stability is improved by a late opening of the intake valves, i.e., the kinetic energy and vorticity are increased. This is due to the formation of an additional positive vortex which adds to the vorticity and kinetic energy of the main tumble. An early intake valve closure, however, leads to a stronger rear part of the ring vortex, which contains negative vorticity and decelerates the main tumble. Furthermore, the amount of turbulent kinetic energy in the intake phase strongly depends on IVO, which is important for the fuel injection and mixing.
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Bücker, I., Karhoff, D., Klaas, M., and Schröder, W., "Engine In-Cylinder Flow Control via Variable Intake Valve Timing," SAE Technical Paper 2013-24-0055, 2013, https://doi.org/10.4271/2013-24-0055.Also In
References
- Adomeit , P. , Jakob , M. , Pischinger , S. , Brunn , A. et al. Effect of Intake Port Design on the Flow Field Stability of a Gasoline DI Engine SAE Technical Paper 2011-01-1284 2011 10.4271/2011-01-1284
- Adomeit , P. , Weinowski , R. , Ewald , J. , Brunn , A. et al. A New Approach for Optimization of Mixture Formation on Gasoline DI Engines SAE Technical Paper 2010-01-0591 2010 10.4271/2010-01-0591
- Algieri , A. , Bova , S. , Bartolo , C. D. Influence of valve lift and throttle angle on intake flow in a high-performance four-stroke motorcycle engine J Eng Gas Turb Power 128 4 934 941 2006
- Benedict , L. , Gould , R. Towards better uncertainty estimates for turbulence statistics Exp. Fluids 22 129 136 1996
- Borée , J. , Maurel , S. , Bazile , R. Disruption of a compressed vortex Phys. Fluids 14 7 2543 2556 2002
- Bücker , I. , Karhoff , D.-C. , Klaas , M. , Schröder , W. Stereoscopic Multi-Planar PIV Measurements of In-Cylinder Tumbling Flow Exp. Fluids 53 6 1993 2009 2012
- Calendini , P. , Duverger , T. , Lecerf , A. , and Trinite , M. In-Cylinder Velocity Measurements with Stereoscopic Particle Image Velocimetry in a SI engine SAE Technical Paper 2000-01-1798 2000 10.4271/2000-01-1798
- Dannemann , J. , Pielhop , K. , Klaas , M. , Schröder , W. Cycle resolved multi-planar flow measurements in a four-valve combustion engine Exp. Fluids 50 4 961 976 2011
- Huang , R. F. , Lin , K. H. , Yeh , C.-N. , Lan , J. In-cylinder tumble flows and performance of a motorcycle engine with circular and elliptic intake ports Exp. Fluids 46 1 165 179 2009
- Kallweit , S. , Willert , C. , Dues , M. , Müller , U. , Lederer , T. PIV for volume flow metering 14th Int Symp on Applications of Laser Techniques to Fluid Mechanics 2008
- Li , Y. , Zhao , H. , Leach , B. , Ma , T. , Ladommatos , N. Characterization of an in-cylinder flow structure in a high-tumble spark ignition engine Int. J. Engine Res. 5 375 400 2004
- Liu , D. , Wang , T. , Jia , M. , Wang , G. Cycle-to-cycle variation analysis of in-cylinder flow in a gasoline engine with variable valve lift Experiments in Fluids 53 585 602 2012
- Lumley , J. L. Engines - An Introduction Cambridge University Press 1999
- Malcolm , J. , Behringer , M. , Aleiferis , P. , Mitcalf , J. et al. Characterisation of Flow Structures in a Direct-Injection Spark-Ignition Engine Using PIV, LDV and CFD SAE Technical Paper 2011-01-1290 2011 10.4271/2011-01-1290
- Patel , R. , Ladommatos , N. , Stansfield , P. A. , Wigley , G. , Garner , C. P. , Pitcher , G. , Turner , J. W. G. , Nuglisch , H. , Helie , J. Un-throttling a direct injection gasoline homogeneous mixture engine with variable valve actuation Int J Engine Res 11 391 411 2010
- Prasad , A. Stereoscopic particle image velocimetry Exp. Fluids 29 103 116 2000
- Raffel , M. , Willert , C. , Wereley , S. , Kompenhans , J. Particle Image Velocimetry: A Practical Guide Springer Berlin 3540723072 2007
- Solomon , A. and Szekely , G. Combustion Characteristics of a Reverse-Tumble Wall-Controlled Direct-Injection Stratified-Charge Engine SAE Technical Paper 2003-01-0543 2003 10.4271/2003-01-0543
- Stanislas , M. , Okamoto , K. , Kähler , C. , Westerweel , J. , Scarano , F. Main results of the third international PIV challenge Exp. Fluids 45 27 71 2008
- Stansfield , P. , Wigley , G. , Justham , T. , Catto , J. , Pitcher , G. PIV analysis of in-cylinder flow structures over a range of realistic engine speeds Exp. Fluids 43 1 135 146 2007
- Stapf , K. , Seebach , D. , Fricke , F. , Pischinger , S. , Hoffmann , K. , Abel , D. CAI-Engines: modern combustion system to face future challenges SIA Int. Conference - The Spark Ignition Engine of the Future France December 2 3 2009
- Thewes , M. , Müther , M. , Pischinger , S. , Budde , M. , Brunn , A. , Sehr , A. , Adomeit , P. , Klankermayer , J. Analysis of the impact of 2-methylfuran on mixture formation and combustion in a direct-injection spark ignition engine Energy & Fuels 25 12 5549 5561 2011
- Tropea , C. , Yarin , A. , Foss , J.F. Springer handbook of experimental fluid mechanics Springer Berlin 978-3-540-25141-5 2007
- Voisine , M. , Thomas , L. , Borée , J. Spatio-temporal structure and cycle to cycle variations of an in-cylinder tumbling flow Exp. Fluids 50 5 1393 1407 2011
- Wilson , T. S. , Xu , H. , Richardson , S. , Wyszynski , M. L. , Megaritis , T. Optical study of flow and combustion in an HCCI engine with negative valve overlap J Phys E: Conf Series 45 94 103 2006
- Wolters , P. , Salber , W. , Geiger , J. , Duesmann , M. et al. Controlled Auto Ignition Combustion Process with an Electromechanical Valve Train SAE Technical Paper 2003-01-0032 2003 10.4271/2003-01-0032
- Wurms , R. , Jung , M. , Adam , S. , Dengler , S. , Heiduk , T. , Eiser , A. Innovative Technologies in Current and Future TFSI Engines from Audi 20th Aachen Colloquium Automobile and Engine Technology 2011