This content is not included in your SAE MOBILUS subscription, or you are not logged in.
An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1990 by SAE International in United States
Annotation ability available
The purpose of this paper is to report on the measurement of the internal air motion in a motored four-valve S.I. engine. Two windows located in the head and a quartz top piston allow the use of Laser Doppler Velocimetry, using either a forward-scatter or a basck-scatter optical arrangement. The latter allows a large spatial exploration of the combustion chamber.
Three intake configurations, which generate various flow fields and turbulence levels, are investigated. The obtained flow patterns exhibit rather different swirl and tumble levels. Experimental data provide the mean and turbulent velocities. Despite the large exploration, the complex structure of the flow cannot be completely understood. In order to improve the description of the whole flow fields, a 3-D model is implemented. Agreement between the model and measurements is relatively good. Thus, the model is very helpful especially for the basic four-valve configuration where two inclined counter-rotating tumbling motions are revealed. For the configurations with swirl, only one inclined tumbling motion is generated. However, in all cases, squeezing of the flow during compression yields a destruction of the tumble and a significant increase of turbulence before TDC.
For the forward-scatter measurements, high data rates have been obtained. A cycle-to-cycle analysis based on a filtering technique in the frequency domain is applied. The main result is that low frequency fluctuations are highly connected to high frequency fluctuations. The ensemble fluctuations are however dominated by the low frequency contribution. The influence of the cut-off frequency is relatively weak. A spectral analysis shows that for all three configurations turbulence is roughly in an equilibrium state, such that its spectrum is almost self-similar.
CitationLe Coz, J., Henriot, S., and Pinchon, P., "An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence," SAE Technical Paper 900056, 1990, https://doi.org/10.4271/900056.
- Chau E.L. Schipperijn F.W. Nagasaka R. Sawyer R.F. Iiyama A. Effect of Intake Valve Configuration on Lean Combustion SAE 880202
- Inoue T. Iguchi S. Yamada T. Furuno S. In Cylinder Gas Motion, Mixture Formation and Combustion of 4 Valve Lean-Burn Engine Proc. of the SIA 152 158 May 1988 Strasbourg
- Nakamura A. Ishii K. Sasaki T. Application of Image Converter Camera to Measure Flame Propagation in S.I. Engine SAE 890322
- Baritaud T. Combustion and Fluid Dynamic Measurements in a S.I. Engine: Effects of Thermochemistry and Velocity Field; Turbulent Flame Speeds SAE 892098
- Gruden D. Richter H. Wurster W. Combustion Chamber Investigations at Porsche-Paving The Way for the 4- Valve Engine SAE 845005
- Witze P.O. Mendes-Lopes J.M.C. Direct Measurement of the Turbulent Burning Velocity in a Homogeneous-Charge Engine SAE 861531
- Hall M.J. Bracco F.V. Cycle-Resolved Velocity and Turbulence Measurements Near the Cylinder Wall of a Firing S.I. Engine SAE 861530
- Henriot S. Le Coz J.F. Pinchon P. Three-Dimensional Modelling of Flow and Turbulence in a Four-Avalve S.I. Engine - Comparison with LDV Measurements SAE 890843
- Amsden A.A. Ramshaw J.D. O'Rourke P.J. Ducowicz J.K. KIVA: A Computer Program for Two- and Three-Dimensional Fluid Flows with Chemical Reactions and Fuel Sprays Los Alamos Report - LA-10245-MS
- Amsden A.A. Ramshaw J.D. Cloutman L.D. O'Rourke P.J. Improvements and Extensions to the KIVA Computer Program
- Amsden A.A. Butler T.D. O'Rourke P.J. Ramshaw J.D. KIVA: A Comprehensive Model for 2D and 3D Engine Simulations SAE 850554
- Gilaber P. Pinchon P. Measurements and Multidimensional Modelling of Gas-Wall Heat Transfer in a S.I. Engine SAE 880516
- Diwakar R. El Tahry S.H. Comparison of Computed Flow-Fields and Wall Heat Fluxes with Measurements from Motored Reciprocating Engine-like Geometries 3rd International Computer Engineering Conference Chicago 1983
- Fortier A. Editions Masson 1975
- Reynolds W.C. Modelling of Fluid Motions in Engines - An Introductory Overview, in Combustion Modelling in Reciprocating Engines Mattavi J.N. Amann C.A. Plenum Press 1980
- Liou T.M. Santavicca D.A. Cycle-Resolved LDV Measurements in a Motored I.C. Engine Trans. ASME, J. Fluids Eng. 107 232 240 1985
- Rask R.B. Comparison of Window, Smoothed-Ensemble, and Cycle-by-Cycle Data Reduction Techniques for LDA Measurements of In-Cylinder Velocity Morel T. Lohmann R.P. Rackley J.M. Fluid Mechanics of Combustion Systems ASME New-York 1981
- Fansler T.D. French D.T. Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine SAE 880377
- Glover A.R. Towards Bias Free Estimates of Turbulence in Engines Third International Symposium on Applications of Laser Anemometry to Fluid Mechanics Lisbon July 1986
- Witze P.O. Martin J.K. Borgnakke C. Conditionally-Sampled Velocity and Turbulence Measurements in a Spark Ignition Engine Combust. Sci. Tech. 36 301
- Witze P.O. Martin J.K. Cyclic-Variation Bias in Spark Ignition Engine Turbulence Measurements Second International Symposium on Applications of Laser Anemometry to Fluid Mechanics Lisbon July 1984
- Hall M.J. Bracco F.V. A Study of Velocities and Turbulence Intensities in Firing and Motored Engines SAE 870453
- Hall M.J. Bracco F.V. Santavicca D.A. Cycle-Resolved Velocity and Turbulence Measurements in an I.C. Engine with Combustion SAE 860320
- Witze P.O. Influence of Air Motion Variation on the Performance of a Direct-Injection Stratified-Charge Engine Sandia-Report 79-8756
- Iijima T. Bracco F.V. LDV Measurements in an Engine with Square and Circular Piston Cups SAE 872073
- Saxena V. Power Spectrum Estimation from Randomly Sampled Velocity Data International Symposium on Laser Anemometry Dybbs A. Pfund P.A. ASME
- zur Loye A.O. Siebers D.L. McKinley T.L. Ng H.K. Primus R.J. Cycle-Resolved LDV Measurements in a Motored Diesel Engine and Comparison with k-E Model Predictions SAE 890618