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Intake-Generated Swirl and Tumble Motions in a 4-Valve Engine with Various Intake Configurations-Flow Visualization and Particle Tracking Velocimetry
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1990 by SAE International in United States
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Flow visualization and particle tracking velocimetry (PTV) were used to study the in-cylinder flow field produced by a 4-valve engine head during the intake process. Several intake configurations were considered, and their effects on the in-cylinder flow structures were assessed. The engine head was mounted on a special single cylinder water analog for the in-cylinder flow visualization and PTV experiments. The results for this study indicate that the in-cylinder flow field during the induction process is comprised of several large scale vortical motions on different planes within the engine cylinder. These large scale fluid motions are, in most cases, stable and highly repeatable from cycle to cycle. No significant in-cylinder tumbling motion was observed in the engine with both intake valves operating. The only well-defined tumbling flow structure was observed with shrouded intake valve configurations. In this case, the in-cylinder flow was dominated by a strong axial-plane vortex which filled the entire cylinder volume. Using the measured velocity fields, tumble and swirl ratios were evaluated under transient conditions.
THE IN-CYLINDER FLUID MOTION in internal combustion engines is one of the most important factors controlling the combustion process. It governs the flame propagation rate in homogeneous charge spark-ignition engines; it controls the fuel-air mixing and burning rates in diesels [1, 2, 3, 4, 5, 6, 7, 8 and 9]. The flow fields prior to combustion in internal combustion engines are generated during the induction process and modified during the compression stroke. Therefore, a good understanding of fluid motion during the induction process is critical to developing engine designs with the most desirable operating and emissions characteristics.
One of the most attractive techniques for characterization of the large scale fluid motion during the intake process in internal combustion engines is water flow visualization [10, 11, 12, 13, 14 and 15]. Observation of the intake flow images and in-cylinder velocity measurements provides useful insights into the induction stroke.
The aim of the present work is to conduct an extensive in-cylinder flow visualization study of the intake-generated fluid motion produced by a 4-valve engine head with different intake configurations. The engine head was mounted on a single-cylinder transient water analog (engine)  for flow visualization purposes. Aspects of flow evolution during the intake stroke were examined for several different intake configurations. First, the experiment was performed with both intake valves operating. Second, one of the intake valves was shut and the in-cylinder flow motion was visualized. Third, a 180-degree shroud was installed on one of the intake valves and the in-cylinder fluid motion was studied for two different shroud positions. These two shroud positions were selected such that they generated strong tumbling and strong swirl motions, respectively. Finally, 180-degree shrouds were installed on both operating intake valves to generate “pure tumble”.
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CitationKhalighi, B., "Intake-Generated Swirl and Tumble Motions in a 4-Valve Engine with Various Intake Configurations-Flow Visualization and Particle Tracking Velocimetry," SAE Technical Paper 900059, 1990, https://doi.org/10.4271/900059.
- Heywood, J. B. “Fluid Motion within the Cylinder of Internal Combustion Engines - The 1986 Freeman Scholar Lecture,” Journal of Fluids Engineering 109 3 March 1987
- Barton, R. K. et al. “An Empirical Model for Correlating Cycle-by-Cycle Cylinder Gas Motion and Combustion Variations of a Spark Ignition Engine,” SAE paper no. 710163 1971
- Winsor, R. E. Patterson, D. J. “Mixture Turbulence - A Key to Cyclic Combustion Variation,” SAE paper no. 730086 1973
- Gosman, A. D. “Multidimensional Modeling of Cold Flows and Turbulence in Reciprocating Engines,” SAE paper no. 850344 1985
- Rask, R. B. “Laser Doppler Anemometer Measurements in an Internal Combustion Engine,” SAE Paper 790094 1979
- Witze, P. O. “Measurements of the Spatial Distribution and Engine Speed Dependence of Turbulent Air Motion in an IC Engine,” SAE paper no. 770220 1977
- Arcoumanis, C. Vafidis, C. Whitelaw, J. H. “Valve and In-Cylinder Flow Generated by Helical Port in a Production Diesel Engine,” ASME Winter Annual Meeting Miami Beach, Florida 1985
- Kyriakides, S. C. Glover, A. R. “A Study of the Correlation Between In-Cylinder Air Motion and Combustion in Gasoline Engines,” IMechE 1988
- Vafidis, C. Vorropoulos, G. Whitelaw, J. H. “Effect of Intake Port and Combustion Chamber Geometry on In-Cylinder Turbulence in a Motored Reciprocating Engine,” ASME Winter Annual Meeting 1987
- Khalighi, B. Huebler, M. S. “A Transient Water Analog Of a Dual-Intake-Valve Engine for Intake Flow Visualization and Full-Field Velocity Measurements,” SAE Transactions paper no. 880519 1988
- Kent, J. C. et al. “Observation on the effect of Intake-Generated Swirl and Tumble on Combustion Duration,” SAE paper no. 892096 1989
- Khalighi, B. “Study of the Intake Swirl Process in an Engine using Flow Visualization and Particle Tracking Velocimetry,” ASME Winter Annual Meeting San Francisco, CA 1989 Symposium on Flow Visualization Book no. H00554 Khalighi, Braun Freitas
- Ekchian, A. Hoult, D. P. “Flow Visualization Study of the Intake Process of an Internal Combustion Engine,” SAE paper no. 790095 1979
- Willas, D. A. Meyer, W. E. Birnie, C. “Mapping of Airflow Patterns in Engines with Induction Swirl,” SAE paper no. 660043 1966
- Hirotomi, T. et al. “Study of Induction Swirl in a Spark Ignition Engine,” SAE paper no. 810496 1981
- Khalighi, B. “Quantitative Fluid Velocity Measurements by Automatic Analysis of Flow Visualization Images,” Experiments in Fluids 7 2 142 144 1989
- Lee, Y. H. Khalighi, B. Shack, D. “Automatic Analysis of Flow Visualization Images,” 31th SPIE Meeting 829 283 292 San Diego, CA August 1987
- Khalighi, B. Lee, Y. H. “Particle Tracking Velocimetry: an Automatic Image Processing Algorithm,” Applied Optics 28 20 4328 4332 October 1989
- Komatsu, G. Shirea, S. “Flow Visualization of Process of Producing Induction Swirl Using a Water Model,” Bulletin of JSME 29 254 2592 2597 August 1986
- Gosman, A. D. Tsui, Y. Y Vafidis, C. “Flow in a Model Engine with a Shrouded Valve - A Combined Experimental and Computational Study,” SAE paper no. 850498 1985
- Haworth, D. C. El Tahry, S. H. Huebler, M. S. Chang, S. “Multidimensional Port-and-Cylinder Flow Calculation for Two-and-Four-Valve-per-Cylinder Engines: Influence of Intake Configuration on Flow Structure,” SAE International Congress & Exposition Detroit 1990
- Alkids, A. C. Puzinnauskas, P.V. Peterson, R. C. “Combustion and Heat Transfer Studies in a Spark-Ignited Multivalve Optical Engine,” SAE International Congress & Exposition Detroit 1990