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Liquid Fuel Flow in the Vicinity of the Intake Valve of a Port-Injected SI Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 19, 1998 by SAE International in United States
Annotation ability available
Liquid fuel flow into the cylinder an important source of hydrocarbon (HC) emissions of an SI engine. This is an especially important HC source during engine warm up. This paper examines the phenomena that determine the inflow of liquid fuel through the intake valve during a simulated start-up procedure. A Phase Doppler Particle Analyzer (PDPA) was used to measure the size and velocity of liquid fuel droplets in the vicinity of the intake valve in a firing transparent flow-visualization engine. These characteristics were measured as a function of engine running time and crank angle position during four stroke cycle. Droplet characteristics were measured at 7 angular positions in 5 planes around the circumference of the intake valve for both open and closed-valve injection. Additionally the cone shaped geometry of the entering liquid fuel spray was visualized using a Planar Laser Induced Fluorescence (PLIF) setup on the same engine. The data allowed detailed analysis of the spatial variation of the liquid fuel flow into the cylinder and of the development of the liquid fuel spray geometry emerging from the intake valve throughout the engine cycle. By combining the quantitative PDPA fuel droplet measurements and the qualitative information of the geometry of the liquid fuel cone entering the cylinder obtained from PLIF images, a procedure was developed to estimate the volume of liquid fuel entering the cylinder as a function of time during warm up. Using this procedure, the mass flow of liquid fuel into the cylinder as a function of time during start-up could be assessed. The mass flow distribution in the vicinity of the intake valve and important cycle phases of fuel inflow were identified.
The results clearly identify 4 transport mechanisms of liquid fuel into the cylinder during the intake stroke: First forward flow atomization, spray contribution, high speed intake flow transport, and fuel film squeezing. The spatial and temporal variation of in-cylinder liquid fuel occurrence in the vicinity of the intake valve is described for open and closed valve injection. Liquid fuel mass flow into the cylinder during start-up shows distinctly different behavior for open and closed valve injection. On open valve injection the amount of liquid fuel in the cylinder decreases steadily during warm-up.
On closed valve injection the occurrence of an inflow maximum about 15 seconds after start-up was observed due to significant wall film build-up in the port.
CitationMeyer, R., Yilmaz, E., and Heywood, J., "Liquid Fuel Flow in the Vicinity of the Intake Valve of a Port-Injected SI Engine," SAE Technical Paper 982471, 1998, https://doi.org/10.4271/982471.
SAE 1998 Transactions - Journal of Fuels and Lubricants
Number: V107-4 ; Published: 1999-09-15
Number: V107-4 ; Published: 1999-09-15
- Cheng, W.K., Hamrin, D., Heywood, J.B., Hochgreb, S., Min, K.D., and Norris, M., “An Overview of Hydrocarbon Emissions Mechanisms in Spark-Ignition Engines”, SAE Paper 932078, 1993, SAE Transactions Vol.102, 1993
- Fox, J.W., Min, K.D., Cheng, W.K., and Heywood, J.B., “Mixture Preparation in a SI Engine with Port Fuel Injection During Starting and Warm-up”, SAE Paper 922170, 1992, SAE Transactions Vol.101, 1992
- Stanglmaier, R.H., Hall, M.J., and Matthews, R.D., “In-Cylinder Fuel Transport During the First Cranking Cycles in a Port Injected 4-Valve Engine”, SAE Paper 970043, 1997
- Kelly-Zion, P.L., Styron, J.P., Lee, C.-F., Lucht, R.P., Peters, J.E., White, and R.A. “In-Cylinder Measurements of Liquid Fuel During the Intake Stroke of a Port-Injected Spark Ignition Engine”, SAE Paper 972945, 1997
- Shin, Y., Cheng, W.K., and Heywood, J.B., “Liquid Gasoline Behavior in the Engine Cylinder of a SI Engine”, SAE Paper 941872, 1994, SAE Transactions Vol.105, 1995
- Shin, Y., Min, K.D., and Cheng, W.K., “Visualization of Mixture Preparation in a Port Fuel Injection Engine During Engine Warm-up”, SAE Paper 952481, 1995, SAE Transactions Vol.104, 1995
- Meyer R., and Heywood, J.B., “Liquid Fuel Transport into the cylinder of a Firing Port-Injected SI Engine During Start Up”, SAE Paper 970865, 1997, SAE Transactions Vol.107, 1997
- Almquist G., Denbratt I., Josefson G., and Magnusson I., “Measurements of Fuel Film Thickness in the Inlet Port of an SI Engine by Laser Induced Flourescence”, SAE Paper 952483, 1995, SAE Transactions Vol.104, 1995
- Takeda K., Yaegashi T., Sekiguchi K., Saito K., and Imatake N., “Mixture Preparation and HC Emissions of a 4-Valve Engine with Port Fuel Injection During Cold Starting and Warm-Up”, SAE Paper 950074, 1995
- Johnen, T., and Haug, M., “Spray Formation Observation and Fuel Film Development Measurements in the Intake of a Spark Ignition Engine”, SAE Paper 950511, 1995, SAE Transactions Vol.104, 1995
- Hardalupas, Y., Taylor, A.M.K.P., and Whitelaw, J.H., “Influence of Injection Timing on In-Cylinder Fuel Distribution in a Honda VTEC-E Engine”, SAE Paper 950507, 1995
- Cousyn, B., Posylkin, M., Vannobel, F., and Whitelaw, J.H., “Droplet Characteristics in Two Cylinders of a Firing Spark Ignition Engine”, SAE Paper 952466, 1995, SAE Transactions Vol.104, 1995
- Arcoumanis, C., Gold, M.R., Whitelaw, J.H., Xu, H.M., Gaade, J.E., and Wallace, S., “Droplet Velocity/Size and Mixture Distribution in a Single-Cylinder Four-Valve Spark-Ignition Engine”, SAE Paper 981186, 1998
- Shelby, M., VanDerWege, B., Hochgreb S., “Early Spray Development in Gasoline Direct-Injected Spark Ignition Engines”, SAE Paper 980160, 1998
- Poulos, S.G., and Heywood, J.B., “The Effect of Combustion Chamber Geometry on S.I. Engine Combustion”, SAE Paper 830334, SAE Transactions Vol.92, 1983
- Heywood, J.B., “Internal Combustion Engine Fundamentals”, McGraw-Hill, 1988, pp.326 - 330