Spray Targeting Inside a Production-Type Intake Port of a 4-Valve Gasoline Engine

Zhao, Fuquan; Yoo, Joon Ho; Lai, Ming Chia

doi:10.4271/960115

Cited by 8 publications

(6 citation statements)

References 2 publications

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“…This has also been observed by Bianchi et al (2007). Though the SMD is a very important parameter, as pointed out by Zhao et al (1996), it is very important to select an injector specifically for a port geometry. Selecting an injector based on a smaller SMD alone can lead to adverse performance.…”

Section: Resultsmentioning

confidence: 57%

“…The performance of PFI engines depends on a number of parameters related to the injection system itself. Hence, the PFI sub-system also needs to be tailored to the specific engine to obtain a robust performance of that engine under various operating conditions (Zhao et al, 1996). Computational Fluid Dynamics (CFD) simulations of port fuel injected engines can help in studying the effect of various parameters on engine performance.…”

Section: Introductionmentioning

confidence: 99%

“…High speed visualisation of the fuelling process in the port of a 4-valve firing PFI engine under closed-valve injections were performed by Shin et al (1995) who found the wall film flow to play an important role in fuel transport. Flow visualisation studies in the intake port of two 4-valve engines fitted with different injectors were performed by Zhao et al (1996). The authors observed that while single stream injectors have good targeting, they have poor fuel dispersing characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of mixture preparation in a small engine with port fuel injection

Anand¹,

Ravikrishna²

2012

PCFD

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Computational Fluid Dynamics simulations are performed to study mixture preparation in the intake manifold of a small engine with Port Fuel Injection. Data from laser-based experiments on two injectors are used as inputs to the spray sub-model. The results reveal improved in-cylinder fuel distribution when the spray is directed onto the intake valve. The Sauter Mean Diameter of the spray is observed to have an insignificant effect during open valve injection, while the targeting is found to have a large influence. The methodology developed as part of this work can be used to further optimize injection parameters in such engines.

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Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling of mixture preparation in a small engine with port fuel injection

Anand¹,

Ravikrishna²

2012

PCFD

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“…The injection system must provide excellent atomization of the fuel for the lowest releasing amount of HC emissions. When the fuel is injected behind of intake valve, the wetness on the intake port is decreased [10,11].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Injection Parameters on Fuel Consumption and Emissions in A PFI Small Spark Ignition Engine

Demirci

Doğan

Cihan

et al. 2021

International Journal of Automotive Science and Technology

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Mixture formation in port fuel spark ignition engines is one of the most im-portant parameters, which affect combustion and emissions. In this study, the ef-fects of different injection start timings and some other port fuel injection (PFI) parameters on the performance and emissions of a water cooled and single cylin-der spark ignition engine were examined experimentally. The experiments were performed at different engine speeds (1200 and 1500 rpm for effect of injection pressure and 1500 rpm for changing injection timings) and different engine loads (3 bar and 5 bar for injection pressure and 1 bar and 5 bar for start of injection). The start of injection was chosen according to intake pressure measurements. The experiment results showed that brake specific fuel consumption (BSFC) and total hydrocarbon (THC) emissions are increased by the increase of the injection pressure. Because with the increase of injection pressure, the fuel can reach the intake manifold wall or intake valve. Therefore, the fuel enters the cylinder as a droplet. Different start of injection experiments showed that injection times have an effect on emissions and performance. The minimum brake specific fuel con-sumption and THC values were obtained at -243 °CA value of injection start. The twice injection in one cycle increased brake specific fuel consumption and THC emissions.

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“…The wall fuel film behavior in the port is a key factor influencing the airffuel mixture distribution in PFI engines that affbcts the engine performance, exhaust emissions and transient response [1,2], The aim of good PFI engine design and control is to reduce the built-up of fuel film in the intake port. Zhao et al [3] considered ways ofreducing fuel wall wetting in a production type intake port and suggested that the iajector type ancl intake port design must be adequately matched for achieving this. In order to reduce wall film, some research has fbcused on fueL spray and atomization, using an air assisted iniector; Maier et al [4] have found better fuel atomization was achieved compared with conventional iajectors, which helps to reduce the wall film in the intake port and thus reduce the chances of fuet reaching the engine cylinder in the forrn of Iarge droplets.…”

mentioning

confidence: 99%

SC4-3: Characterisation of the Wall Fuel Film Development in a Simulated Engine Intake Port(SC: Spray and Spray Combustion,General Session Papers)

Wang

Arcoumanis

Iida

et al. 2008

COMODIA

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Characterisation of the wall film development in port fuel iniection (PFI) motorcycle and car engines is very important in achieving higher perforrnance, lower emissions and better fuel consumption. As part of an on-going research programrne, an in-house system was developed based on the Laser Induced Fluorescence (LIF) technique to allow the aecurate measurement ofthe fuel film thickness in a simulated intake port, complemented by visualisation of the film development using high speed video imaging. TWo fuels have been investigated: iso-octane doped with 5% (v/v) 2,3-hexanedione and conventional gasoline. Parametric studies have been carried out by investigating the effect of irijection durationfquantity, air velocity and port backpressure. Representative data on the chaTacteristics of the fuel fi1rn for the two examined fuels are presented, fbllowed by discussion of the results and conclusions.

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Spray Targeting Inside a Production-Type Intake Port of a 4-Valve Gasoline Engine

Cited by 8 publications

References 2 publications

Modelling of mixture preparation in a small engine with port fuel injection

Modelling of mixture preparation in a small engine with port fuel injection

The Effect of Injection Parameters on Fuel Consumption and Emissions in A PFI Small Spark Ignition Engine

SC4-3: Characterisation of the Wall Fuel Film Development in a Simulated Engine Intake Port(SC: Spray and Spray Combustion,General Session Papers)

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