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An Experimental Study of In-Cylinder Air Flow in a 3.5L Four-Valve SI Engine by High Speed Flow Visualization and Two-Component LDV Measurement
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Abstract
In-cylinder flows in four-valve SI engines were examined by high frame rate flow visualization and two-component LDV measurement. It is believed that the tumble and swirl motion generated during intake breaks down into small-scale turbulence later in the cycle. The exact nature of this relationship is not well known. However, control of the turbulence offers control of the combustion process. To develop a better physical understanding of the in-cylinder flow, the effects of the cylinder head intake port configuration and the piston geometry were examined.
For the present study, a 3.5L, four-valve engine was modified to be mounted on an AVL single cylinder research engine type 520. A quartz cylinder was fabricated for optical access to the in-cylinder flow. Piston rings were replaced by Rulon-LD rings. A Rulon-LD ring is advantageous for the optical access as it requires no lubrication.
Four different cylinder head intake port configurations and two piston geometries were studied using a high speed flow visualization technique. Examination of these films suggested that quantitative velocity measurements be conducted for the two different piston configurations. The effect of the piston geometry on the in-cylinder flow was examined by LDV measurement. The flow visualization shows that cylinder head intake port configuration plays a significant role in the generation of initial tumble motion in the early stage of the intake stroke. While the in-cylinder flow is developing, the pop-up piston geometry accelerates the flow field in the axial direction, which provides the strong tumble motion. This may result in an improvement in small-scale turbulence late in the compression stroke.
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Citation
Lee, K., Yoo, S., Stuecken, T., McCarrick, D. et al., "An Experimental Study of In-Cylinder Air Flow in a 3.5L Four-Valve SI Engine by High Speed Flow Visualization and Two-Component LDV Measurement," SAE Technical Paper 930478, 1993, https://doi.org/10.4271/930478.Also In
References
- Henriot, S. Le Coz, J.F. Pinchon P “Three-Dimensional Modeling of the Flow and Turbulence in a Four-Valve S.I. Engine - Comparison with LDV Measurements,” SAE Paper No. 890843 1989
- Le Coz, J.F. Henriot, S. Pinchon, P. “An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine- Focus on Cycle-Resolved Turbulence,” SAE paper No. 900056 1990
- Endres, H. Neuber, H.J. Wunns, R. “Influence of Swirl and Tumble on Economy and Emissons of Multi-Valve SI Engine,” SAE Paper No. 920516 1992
- Kudou, H. Yamamoto, H. Lida, Y. “A Study About In-Cylinder Flow and Combustion in a 4-Valve SI Engine,” SAE paper No. 920574 1992
- Schock, H. J. Hamady, F. J. Stuecken, T.R. “Air Flow Visualization and LDV Measurements Around an Intake Valve in a Chrysler 2.2L Cylinder Head,” Technical report MSUREL R-89-2 Chrysler Motors Corporation Sep. 25 1989
- Schock, H.J. Harnady, F.J. Defilippis, M.S. LaPointe, L.A. “High Frame Rate Flow Visualization and LDV Measurements in a Steady Flow Cylinder Head Assembly,” SAE Paper No. 910473 Feb. 25 1991
- Hamady, FJ. Chouinard, E.N. Somerton, C.W. Schock, HJ. Chun, K.S. Hicks, YR. “Stratified Charge Rotary Engine Internal Flow Studies,” SAE Paper No. 890331 Feb. 27 1989 98 SAE Trans. 1989
- Hamady, F.J. Stuecken, T.R. Schock, HJ. “Air Flow Visualization and LDV Measurements in a Motored Rotary Engine Assembly - Part 1,” SAE Paper No. 900030 Feb. 26 1990 99 SAE Trans. 1990
- Chouinard, E.N. Hamady, F.J. Schock, H.J. “Airflow Visualization and LDV Measurements in a Motored Rotary Engine Assembly - Part 2,” SAE Paper No. 900031 Feb. 26 1990 99 SAE Trans. 1990
- Hamady, F.J. Stuecken, TR. Schock, H.J. “Experimental Analysis of Blowby and Flow Field Interaction in a Motored Rotary Engine,” SAE Paper No. 910893 Feb. 25 1991
- Regan, C.A. Chun, K.S. Schock, H.J. “Engine Flow Visualization Using Copper Vapor Laser,” Proceedings of SPIE 737 17 27 1987
- Morita, T.B. Hamady, FJ. Stuecken, T.R. Somerton, C.W. Schock, H.J. “Fuel- Air Mixing Visualization in a Motored Rotary Engine Assembly,” SAE Paper No. 910704 Feb. 25 1991
- Instruction Manual for Digital Burst Correlator TSI Inc. April 1991
- Adrian, Ron “High Speed Correlation Techniques,” TSI Quarterly VIII April-June 1982
- Rask, R.B. “Laser Doppler Anemometer Measurements in an Internal Combustion Engine,” SAE Paper No. 790094 Feb. 26 1979
- Falco, R.E. Gendrich, C.R Chu, C.C. “Vorticity Field Measurements Using Laser Induced Photochemical Anemometry,” Seventh Symposium on Turbulent Shear Flows Stanford University August 21-23 1989
- Reuss, D.L. Adrian, R.J. Landreth, C.C. French, D.T. Fansler, T.D. “Instantaneous Planar Measurements of Velocity and Strain Rate in an Engine Using Particle-Image Velocimetry,” SAE Paper No. 890616 1989