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Investigation of the In-Cylinder Tumble Motion In a Multi-Valve Engine: Effect of the Piston Shape
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 01, 1997 by SAE International in United States
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An experimental investigation is carried out on in-cylinder motion, during the intake and compression strokes of a spark-ignited multi-valve engine. This study is conducted on a single cylinder four valve research engine. The engine is equipped with several optical accesses on cylinder liner and cylinder head. The turbulence and local velocity in combustion chamber were measured by Laser Doppler Velocimetry. Furthermore, effects of different bowl shapes on turbulence, cycle by cycle flow variations, and tumble distortion were studied.
Tumble velocity field exhibits a triplet vortices structure composed of one vertical and two horizontal vortices. This structure is induced during the inlet stroke, and remains during compression. In the latest stage of compression, tumble is converted into a pair of horizontal vortices. Velocity measurements in the cylinder show a precession motion of tumble center. Distortion of tumble is very unstable and perturbed with a flat top piston. Cycle by cycle variations of tumble timing distortion is observed, increasing velocity fluctuations. A new approach to remove cycle by cycle variations at the end of the compression stroke, when computing cycle-resolved turbulence, is proposed.
Bowls reduce cycle by cycle flow variations and turbulence intensity at ignition. Furthermore, steady flow rig measurements, as LDV investigations on the single cylinder during the intake stroke, demonstrate the influences of the bowl location on the tumble charge angular momentum at the end of the intake stroke.
CitationBaby, X. and Floch, A., "Investigation of the In-Cylinder Tumble Motion In a Multi-Valve Engine: Effect of the Piston Shape," SAE Technical Paper 971643, 1997, https://doi.org/10.4271/971643.
- FRAIDL G.K. PIOCK W.F. WIRTH M. “Gasoline Direct Injection: Actual Trends and Future Strategies for Injection and Combustion Systems.” SAE 960465
- LAKE T.H. SAPSFORD S.M. STOKES J. JACKSON N.S. “Simulation and Development Experience of a Stratified Charge Gasoline Direct Injection Engine.” SAE 962014
- FLOCH A. VAN FRANK J. AHMED A. “Comparison of the Effects of Intake-Generated Swirl and Tumble on Turbulence Characteristics in a 4-Valve Engine.” SAE 952457
- KENT J.C. MIKULEC A. RIMAI L. ADAMCZYK A.A. MUELLER S.R. STEIN R.A. WARREN C.C. “Observations on the Effects of Intake-Generated Swirl and Tumble on Combustion Duration.” SAE 892096
- CHAROENPHONPHANICH C. OTAKA M. ENNOJI H. LIJIMA T. HUKUMOTO M. “In Cylinder Fluid Motion and Mixing of a Dual Intake Valve Spark Ignition Engine.” SAE 960266
- LIOU T.-M. SANTAVICCA D.A. “Cycle Resolved Turbulence Measurements in a Ported Engine With and Without Swirl.” SAE 830419
- ARCOUMANIS C. BAE C.S. HU Z. “Flow and Combustion in a Four-Valve Spark-Ignition Optical Engine.” SAE 940475
- KHALIGHI B. “Intake-Generated Swirl and Tumble Motions in a 4-Valve Engine with Various Intake Configurations-Flow Visualization and Particle Tracking Velocimetry.” SAE 900059
- TRIGUI N. KENT J.C. GUEZENNEC Y. CHOI W.C. “Characterization of Intake-Generated Fluid Flow Fields in IC Engines Using 3-D Particle Tracking Velocimetry (3-D PTV).” SAE 940279
- KIYOTA Y. AKISHINO K. ANDO H. “Concept of Lean Combustion by Barrel Stratification.” SAE 920678
- LE COZ J.F. “Cycle to Cycle Correlation between Flow Field and Combustion Initiation in an S.I. Engine.” SAE 920517
- ARCOUMANIS C. HU Z. VAFIDIS C. WHITELAW J.H. “Tumbling Motion: A Mechanism for Turbulence Enhancement in Spark-Ignition Engines.” SAE 900060
- SAXENA V. RASK R.B. “Influence of Inlet Flows on the Flow Field in an Engine.” SAE 870369
- KANG K.Y. BAEK J.H. “Tumble Flow and Turbulence Characteristics in a Small Four-Valve Engine.” SAE 960265
- JIE M.-S. KIM M.-H. KIM W.-T. “The Effect of Tumble Flow on Engine Performance and Flame Propagation.” SAE 931946
- BENJAMIN S.F. “A Phenomenological Model for ‘Barrel’ Swirl in Reciprocating Engines.” Technical Paper, ImechE 1992
- NEUBER H.-J. GEIGER J. “Continuous Variable Tumble - A New Concept for Future Lean Burn Engines.” SAE 960607
- KUWAHARA K. WATANABE T. TAKEMURA J. OMORI S. KUME T. ANDO H. “Optimization of In-Cylinder Flow and Mixing for a Center-Spark Four-Valve Engine Employing the Concept of Barrel-Stratification.” SAE 940986
- KUWAHARA K. KAWAI T. ANDO H. “Influence of Flow Field Structure after the Distortion of Tumble on Lean-Burn Flame Structure.” International Symposium COMODIA 1994
- TAKAGI Y. “The Role of Mixture formation in Improving Fuel Economy and Reducing Emissions of Automotive SI Engines.” FISITA 1996
- LIOU T.-M. SANTAVICCA D.A. “Cycle Resolved LDV Measurements in a Motored IC Engine.” Journal of Fluids Engineering 107 1985
- HADDED O. DENBRATT I. “Turbulence Characteristics of Tumbling Air Motion in a Four-Valve SI Engines and their Correlation with Combustion Parameters.” SAE 910478
- FRASER R.A. BRACCO F.V. “Cycle Resolved LDV Integral Length Scale Measurements Investigating Clearance Height Scaling, Isotropy, and, Homogeneity in an IC Engine.” SAE 890615
- LENGYEL I. 1995
- SAPORTA G. “Probabilités, Analyse des Données et Statistique.” Technip 1990
- ARCOUMANIS C. HADJIAPOSTOLOU Z. WHITELAW J.H. “Swirl Center Precession in Engine Flows.” SAE 870370
- OMORI S. IWACHIDO K. MOTOMOCHI M. HIRAKO O. “Effect of Intake Port Flow Pattern on the In-Cylinder Tumbling Air Flow in Multi-Valve SI Engines.” SAE 910477
- RÖNNBÄCK M. XIAO LE W. LINNA J.R. “Study of Induction Tumble by Particle Tracking Velocimetry in a 4-Valve Engine.” SAE 912376
- KUME T. IWAMOTO Y. LIDA K. MURAKAMI M. AKISHINO K. ANDO H. “Combustion Control Technologies for Direct Injection SI Engine.” SAE 960600