Quantitative Analysis of Fuel Behavior in Port-Injection Gasoline Engines

Imatake, Nobuo; Saito, Kimitaka; Morishima, Shingo; Kudo, Shunji; Ohhata, Akira

doi:10.4271/971639

Cited by 21 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…26). This confirms that the fuel droplets are not completely vaporized at the end of the intake stroke, as has been observed by experiments on engines [5,8,27,28]. This part of the work is still in progress for different operating conditions of port fuel injection SI engines.…”

Section: Application To the Port Fuel Injection Si Enginesupporting

confidence: 83%

See 1 more Smart Citation

Potential of inertial instabilities for fuel film separation in port fuel injection engine conditions

Maroteaux

Llory

Coz

et al. 2003

International Journal of Engine Research

View full text Add to dashboard Cite

In port fuel injection engines, the liquid fuel film accumulated in the vicinity of intake valves is torn away and goes into the cylinder during the intake phase. In order to predict the fuel mixture preparation inside the cylinder, a model for the fuel film separation near the sharp edges of the intake valves has been developed. A separation criterion is set up using an analogy with Rayleigh-Taylor instabilities driven by the inertial forces of the film. The critical value for the separation criterion is adjusted using experimental data obtained in a two-dimensional wind tunnel fitted with different steps shaped as the valve seat and reproducing the main characteristics of the intake of a spark ignition engine. Computational fluid dynamics simulations are performed using the KMB code, a modified version of KIVA-2 already including a film model and a stochastic Lagrangian description of the spray. Computation for the intake stroke on a four-cylinder 1.9 litre port fuel injection engine confirms that the fuel droplets are not completely vaporized at the end of the intake stroke.

show abstract

Section: Application To the Port Fuel Injection Si Enginesupporting

confidence: 83%

“…Fig 5. Ratio between the bend radius and film thickness versus step angle (ts film , film thickness; a =a geometrical ).…”

mentioning

confidence: 99%

Potential of inertial instabilities for fuel film separation in port fuel injection engine conditions

Maroteaux

Llory

Coz

et al. 2003

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Optimization of in-cylinder air-fuel mixture preparation from PFI is a major goal for gasoline engine manufacturers. Since some of the injected fuel remains in the intake port as a liquid after the injection event and the intake stroke, researchers have investigated these liquid fuel puddles experimentally [9] and with models. The modelling efforts are frequently very detailed [10][11][12][13][14] and provide interesting physical insights into intake port fuel dynamics.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous in-cylinder and exhaust cycle resolved non-dispersive infrared and flame ionization detector experimental sampling results during cranking and startup in a port fuel injection co-operation fuel research engine

Cowart

Hamilton

2008

International Journal of Engine Research

View full text Add to dashboard Cite

Optimization of in-cylinder air—fuel mixture preparation in port fuel injected engines during all phases of operation is critical for maximizing engine performance while minimizing harmful emissions. In this study, a co-operative fuels research (CFR) gasoline engine is used to evaluate torque and measure in-cylinder and exhaust CO, CO2, and unburned hydrocarbons under various fuelling and spark conditions during cranking and startup phases. Fast flame ionization detectors and non-dispersive infrared fast CO and CO2 detectors are used as the principal diagnostics. Measured component trends are shown with detailed explanations. CFR engine exhaust unburned hydrocarbon levels are shown to be 3 to 7 times higher for startup than for steady state operation depending on spark timing and fuelling. Torque is found to be relatively insensitive to fuelling within 5 per cent of stoichiometric. Additionally, in-cylinder and exhaust CO levels are strong functions of startup enrichment. Exhaust CO, much easier to measure than in-cylinder CO, could be used to meter fuel more tightly during startup in order to reduce undesirable emissions. Exhaust CO levels can be at or below stabilized engine steady state levels depending on fuelling levels. Exhaust CO2 measurements are found to be not reliable indicators of in-cylinder conditions.

show abstract

“…In the USA, and California in particular, similar or more stringent regulatory measures are in place or planned. In recent years there has been a growth of research activity directed at understanding and defining the various mechanisms that affect coldrunning performance [2][3][4][5][6][7][8][9][10][11][12][13]. In the work reported here, fuel transport and utilization and the connection between these and engine-out emissions have been investigated for a range of quasi-steady and transient engine conditions.…”

mentioning

confidence: 99%

In-cylinder fuel behaviour and exhaust emissions during the cold operation of a spark ignition engine

Shayler

Belton

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

A model has been developed from experimental results to describe the passage and utilization of fuel after injection to its exhaust as fuel products or loss to the crankcase during warm-up after a cold start. Engine-out emissions of unburned hydrocarbons (HCs) and carbon monoxide can be predicted for both quasi-steady and transient engine operating conditions during warm-up. The model is phenomenological. Model coefficients, which are either constants or simple functions of engine coolant temperature, have been determined for best matching of predictions to experimental data covering a wide range of conditions. The model has been used to investigate the variation in in-cylinder fuel film mass, fuel lost to the crankcase, exhaust air-fuel ratio variations and engine-out emissions. The dependence of these on steady and transient engine operating conditions is described.Keywords: spark ignition engines, cold operation, in-cylinder fuel films, fuel loss to crankcase, hydrocarbon and CO emissions, model and experiment NOTATION AFR airborne air-fuel ratio of the airborne mixture AFR comb air-fuel ratio of the combusted mixture CO vol % carbon monoxide concentration (vol %) mass of fuel within the piston crevices m crev (g) mass of deposits in the combustion m d chamber (g) m port mass of fuel within the port film (g) mass of fuel within the cylinder wall m wall film (g) molar mass of carbon monoxide m CO (kg/kmol) molar mass of exhaust products m exh (kg/kmol) air mass flowrate (g/s) m ; air m ; bulk HC mass flowrate of unburned hydrocarbons (HCs) from the bulk mixture (g/s) m ; crev rate of change in the fuel mass in the piston crevices (g/s) m ; crev HC mass flowrate of unburned HCs from the piston crevices (g/s) m ; cycle HC mass flowrate of unburned HCs from intracycle source (g/s) rate of fuel returning to the cylinder m ; cyl from the piston crevices (g/s) m ; CO mass flowrate of carbon monoxide (g/s) rate of fuel deposition to the cylinder m ; dep wall film (g/s) m ; exh mass flowrate of fuel products (g/s) mass flowrate of unburned HCs in the m ; exh HC exhaust (g/s) rate of fuel delivery by the injectors m ; inj (g/s) m ; ind rate of fuel induction to the cylinder (g/s) rate of change in the port film mass m ; port (g/s) m ; ret rate of fuel returning from the cylinder film (g/s) m ; sump rate of fuel loss to the oil sump from the piston crevices (g/s) m ; wall rate of change in the cylinder wall film mass (g/s) mass flowrate of unburned HCs from m ; wall HC the cylinder wall film (g/s) N engine speed (r/min) time when first fire occurs (s) t 0 engine coolant temperature (°C) T X fraction of injected fuel deposited on the port surface The MS was recei6ed on

show abstract

Quantitative Analysis of Fuel Behavior in Port-Injection Gasoline Engines

Cited by 21 publications

References 7 publications

Potential of inertial instabilities for fuel film separation in port fuel injection engine conditions

Potential of inertial instabilities for fuel film separation in port fuel injection engine conditions

Simultaneous in-cylinder and exhaust cycle resolved non-dispersive infrared and flame ionization detector experimental sampling results during cranking and startup in a port fuel injection co-operation fuel research engine

In-cylinder fuel behaviour and exhaust emissions during the cold operation of a spark ignition engine

Contact Info

Product

Resources

About