This content is not included in your SAE MOBILUS subscription, or you are not logged in.
PIV In-Cylinder Flow Measurements of Swirl and the Effect of Combustion Chamber Design
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 08, 2004 by SAE International in United States
Annotation ability available
Particle Image Velocimetry (PIV) experiments were performed on single-cylinder versions of a 0.375 L/cylinder and a 0.5 L/cylinder engines from the same engine class to determine the differences in swirl flow between the two engines. Two engine speeds (750 and 1500 rpm), manifold pressures (75 kPa and 90 kPa) and valve timings (maximum overlap and with the intake valve 20° retarded from the max overlap position) were examined. The swirl ratio (SR) and mean velocity (|V|) were calculated at BDC for every case in the mid-stroke plane and the fluctuation velocity (U') calculated for the 1500 rpm / 90 kPa / maximum overlap case. The in-cylinder velocities do not differ by the expected ratio of mean piston speed caused by differences in the engine stroke. The smaller engine was expected to have lower in-cylinder velocities and SRs due to a shorter stroke and lower piston speeds but instead has SR and |V| levels that are the same or higher than the larger engine.
In addition, the fluctuation velocities between the two engines are essentially identical. The values of U´ exhibit the proper scaling with engine speed but show only minor differences between the two engines. Examination of the flow fields show that the intake jet from the smaller engine is stronger. The smaller intake valves of the 0.375 L engine cause higher velocities in the intake flow. Also, the position of the intake valves and the relative spacing of the valve edges lead the smaller engine to have an advantage in swirl formation.
CitationAlger, T., McGee, J., Gallant, E., and Wooldridge, S., "PIV In-Cylinder Flow Measurements of Swirl and the Effect of Combustion Chamber Design," SAE Technical Paper 2004-01-1952, 2004, https://doi.org/10.4271/2004-01-1952.
Direct Fuel Injection, Engine Diagnostics, and New Developments in Powertrain Triboligy, Cvt, Atf, and Fuel Economy
Number: SP-1891; Published: 2004-06-08
Number: SP-1891; Published: 2004-06-08
- Reuss, D. Adrian R. Landreth C. French D. Fansler T. 1989 ‘Instantaneous Planar Measurements of Velocity and Large-Scale Vorticity and Strain Rate in an Engine Using Particle Image Velocimetry’ SAE 890616
- Reuss, D. Kuo T.-W. Khalighi B. Haworth D. Roaslik M. 1995 ‘Particle Image Velocimetry Measurements in a High-Swirl Engine Used for Evaluation of Computational Fluid Dynamics Calculations’ SAE 952181
- Reuss, D. 2000 ‘Cyclic Variability of Large-Scale Turbulent Structures in Directed and Undirected IC Engine Flows’ SAE 2000-01-0246
- Richter, M. Axelsson B. Alden M. et al. 1999 ‘Investigation of the Fuel Distribution and the In-cylinder Flow Field in a Stratified Charge Engine Using Laser Techniques and Comparison with CFD-Modeling’ SAE 1999-01-3540
- Lee, J. Yamakawa M. Isshiki S. Nishida N. 2002 ‘An Analysis of Droplets and Ambient AIr Interaction in a D.I. Gasoline Spray Using LIF-PIV Technique’ SAE 2002-01-0743
- Rottenkolber, G. Dullenkopf K. Wittig S. et al. 1999 ‘Influence of Mixture Preparation on Combustion and Emissions Inside an SI Engine by Means of Visualization, PIV and IR Thermography During Cold Operating Conditions’ SAE 1999-01-3644
- Siewert, R. 1978 ‘Engine Combustion at Large Bore-to-Stroke Ratios’ SAE 780968
- Alger, T. Blobaum E. McGee J. Wooldridge S. 2003 ‘PIV Characterization of a 4-valve engine with a CPS system’ SAE 2003-01-1803
- Adrian, R. Christensen K. Liu Z.-C. Analysis and interpretation of instantaneous turbulent velocity fields Experiments in Fluids 2000 29 3 275 290
- Matthews, R.D. Internal Combustion Engines 2000
- Hall, M. Bracco F. 1987 ‘A study of velocities and turbulence intensities in firing and motored engines’ SAE 870453