Development of a Low Pressure Direct Injection System for a Small 2S Engine. Part I - CFD Analysis of the Injection Process

Direct injection of gaseous fuel has emerged to be a high potential strategy to tackle both environmental and fuel economy requirements. However, since the electronic gaseous injection technology is rather new for automotive applications, limited experience exists on the optimum configuration of the injection system and the combustion chamber. To facilitate the development of these applications computer models are being developed to simulate gaseous injection, air entrainment, and the ensuing combustion. This paper introduces a new method for modeling the injection process of gaseous fuels in multidimensional simulations. The proposed model allows holding down grid requirements, thus, making it compatible with the three-dimensional simulation of an internal combustion engine.

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Study of a Small Two-Stroke Engine with Low-Pressure Air-Assisted Direct-Injection System

10.4271/912350 ◽

1991 ◽

Cited By ~ 4

Author(s):

Huei-Huay Huang ◽

Yu-Yin Peng ◽

Ming-Hong Jeng ◽

James H. Wang

Keyword(s):

Direct Injection ◽

Low Pressure ◽

Injection System ◽

Stroke Engine

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Two-Step Low-Pressure Direct Injection System for Hydrogen Fuelled Engines

10.4271/2010-01-2156 ◽

2010 ◽

Cited By ~ 1

Author(s):

Stefano Frigo ◽

Stefania Zanforlin ◽

Ettore Musu ◽

Riccardo Rossi ◽

Roberto Gentili

Keyword(s):

Direct Injection ◽

Low Pressure ◽

Injection System

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A Phenomenological Model for Combustion and Emissions in Small Bore, High Speed, Direct Injection Diesel Engines

ASME 2005 Internal Combustion Engine Division Spring Technical Conference ◽

10.1115/ices2005-1024 ◽

2005 ◽

Author(s):

N. A. Henein ◽

I. P. Singh ◽

L. Zhong ◽

Y. Poonawala ◽

J. Singh ◽

...

Keyword(s):

Diesel Engine ◽

Diesel Engines ◽

Phenomenological Model ◽

High Speed ◽

Gas Flow ◽

Fuel Injection ◽

Direct Injection ◽

Injection System ◽

Injection Process ◽

Wide Range

This paper introduces a phenomenological model for the fuel distribution, combustion, and emissions formation in the small bore, high speed direct injection diesel engine. A differentiation is made between the conditions in large bore and small bore diesel engines, particularly regarding the fuel impingement on the walls and the swirl and squish gas flow components. The model considers the fuel injected prior to the development of the flame, fuel injected in the flame, fuel deposited on the walls and the last part of the fuel delivered at the end of the injection process. The model is based on experimental results obtained in a single-cylinder, 4-valve, direct-injection, four-stroke-cycle, water-cooled, diesel engine equipped with a common rail fuel injection system. The engine is supercharged with heated shop air, and the exhaust back pressure is adjusted to simulate actual turbo-charged diesel engine conditions. The experiments covered a wide range of injection pressures, EGR rates, injection timings and swirl ratios. Correlations and 2-D maps are developed to show the effect of combinations of the above parameters on engine out emissions. Emphasis is made on the nitric oxide and soot measured in Bosch Smoke Units (BSU).

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Modelling and simulation of working processes in Wankel engine with direct hydrogen injection system

Combustion Engines ◽

10.19206/ce-116890 ◽

2015 ◽

Vol 161 (2) ◽

pp. 42-52

Author(s):

Władysław MITIANIEC

Keyword(s):

Fuel Injection ◽

Direct Injection ◽

Injection System ◽

Compression Process ◽

Injection Process ◽

High Pollution ◽

Spatial System ◽

Scavenge Process ◽

Wankel Engine ◽

Inertia Forces

Wankel engines were very attractive in automotive sector almost forty years ago because of small dimensions, compactness, simple design, smoothness of engine work and lack of vibration caused by inertia forces. The disadvantage of such engine was very high pollution, especially of hydrocarbons and carbon monoxide and high fuel consumption. These disadvantages can be eliminated by applying of direct injection of hydrogen and in the aviation sector by applying of fuel with high octane number also at a direct injection system. The main objective of the work is modelling of the thermodynamic process taking place during the scavenge process in such engine. At assumed geometry of the engine, initial and boundary conditions the change of engine parameters such as pressure, temperature, density, heat exchange and volume are calculated on the base of zero-dimensional model as a function of rotation angle of the piston. Forming of the mixture during fuel injection process in compression process gives information about the air excess ratio. The presented model is applicable for different sort of fuels. This work is introduction to a broader analysis of the processes in spatial system. Application of hydrogen reduces of toxic components emission from such engine, but decreases also engine power.

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