This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Flow Characteristics in Intake Port of Spark Ignition Engine Investigated by CFD and Transient Gas Temperature Measurement
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1996 by SAE International in United States
Annotation ability available
A computational fluid dynamics (CFD) prediction of the transient flow in the intake system of a spark ignition engine is compared to experimental data. The calculation was performed for a single cylinder version of a pre-1995 Ford two-valve production engine, while experiments were carried out on a single cylinder Ricardo Mark 3 research engine with similar overall geometric parameters. While the two engines have somewhat different geometries, this was not considered to be a significant problem for our study of flow features. Both set-ups employed gaseous fuel.
The calculation was performed using the commercially available Star-CD code incorporating the complete intake manifold runner and cylinder into the mesh. Cylinder pressures were in good agreement with experiment indicating that wave dynamics were well captured. Comparison was also made to the measured instantaneous gas temperatures along the intake system. Good agreement was found for thus detected penetration depths of the backflow from the cylinder into the intake port as it occurs during part throttle operation.
A particularly interesting flow feature was predicted by the CFD calculation. The high speed jet which emanates into the intake port from the cylinder attached to the back of the intake valve. This produced a region of very high heat transfer, which may have strong impact on liquid fuel evaporation during engine warm-up.
A discrepancy was observed for the forward flow phase of the intake process. CFD predicted that the forward flow quickly entrains all the burnt gas in the intake port and manifold from the preceding backflow. The experimental data on the other hand, indicated that traces of residual gas are present during the entire forward flow phase of the intake process.
|Technical Paper||Influence of Gas Exchange and Volumetric Efficiency on Knock Behavior in a Spark-Ignition Engine|
|Technical Paper||Cylinder Pressure Based Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing|
CitationBauer, W., Heywood, J., Avanessian, O., and Chu, D., "Flow Characteristics in Intake Port of Spark Ignition Engine Investigated by CFD and Transient Gas Temperature Measurement," SAE Technical Paper 961997, 1996, https://doi.org/10.4271/961997.
- Cheng, C-O et al. ‘Intake Port Phenomena in a Spark Ignition Engine at Part Load,’ 1991 SAE paper 912401
- Gosman, A D Ahmed, A M Y ‘Measurement and Multidimensional Prediction of Flow in a Axisymmetric Port/Valve Assembly,’ 1987 SAE paper 870592
- Befrui, B A ‘CFD Simulation and Comparison with Measurement of Steady Flow in Intake Ports and Combustion Chambers,’ 1994 International Symposium COMODIA 94
- Tatschl, R et al. ‘Multidimensional Simulation of Flow Evolution, Mixture Preparation and Combustion in a 4-Valve SI Engine,’ 1994 International Symposium COMODIA 94
- Kuo, T-W Chang, S ‘Three-Dimensional Computations of Flow and Fuel Injection in an Engine Intake Port,’ Journal of Engineering for Gas Turbines and Power July 1991 113 427
- Kuo, T-W ‘Multidimensional Port-and-Cylinder Gas Flow, Fuel Spray, and Combustion Calculations for a Port-Fuel-Injection Engine,’ SAE 920515
- Zapf, H ‘Contribution to the Investigation of Heat Transfer during Charge Exchange of a Four-Stroke Diesel Engine,’ In German 1969
- Kakac, S et al. Handbook of Single-Phase Convective Heat Transfer John Wiley & Sons 1987