Mixture Preparation for Direct-Injection SI Engines

Ohsuga, Minoru; Shiraishi, Takashi; Nogi, Toshiharu; Nakayama, Youko; Sukegawa, Yoshihiro

doi:10.4271/970542

Cited by 23 publications

(2 citation statements)

References 4 publications

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“…Bir enjeksiyon sisteminin maksimum püskürtme basıncı, silindir çapı/strok boyu oranı, sıkıştırma oranı ve karışım oranına bağlı olarak 50 ile 150 bar arasında değişir. Bu tür enjeksiyon sistemlerinde yakıt demetindeki yakıt damlalarının hızı 30-70 m/s, büyüklüğü 20-30 µm arasında olup 80 mm'nin üzerinde derinlik nüfusuna sahip olduğu görülmüştür (Ohsuga et al 1997). Son yıllarda buji ateşlemeli motorlarda direkt püskürtme sistemleri oldukça popüler hale gelmiştir.…”

Section: Introductionunclassified

Investigation of the Effect of Using Ultrasonic Fuel System on Exhaust Emissions in a Spark Ignition Engine

ÖNER

ÖZTÜRK

Tanyeri

2022

Afyon Kocatepe University Journal of Sciences and Engineering

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Fragmentation and mixing of the fuel used in spark ignition engines with air is highly effective on combustion and exhaust emissions. Studies are carried out on fuel systems in order to prepare the ideal air-fuel mixture ratio suitable for different operating conditions of the engine. In this study, ultrasonic fuel system was used as an alternative to the traditional fuel systems used in spark ignition engines. The average droplet diameter of 20-30 µm in the injector fuel system used in spark ignition engines has been realized as 12 µm with ultrasonic fragmentation. The engine was run at ½ constant load at different speeds with ultrasonic, carburetor and injection fuel systems, and exhaust emissions were measured. The maximum values of the measured exhaust emissions for the three fuel systems were examined comparatively. When the ultrasonic fuel system is used, there is a 99% reduction in CO, 60% in HC, 18% in NOx, 10% and an increase in CO2 compared to the carburetor system, 99% reduction in CO, 12% in CO2, and 45% in HC compared to the injector system. It was observed that there was a 55% increase in NOx. In general, it has been determined that the ultrasonic fuel system has a positive effect on exhaust emissions.

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Section: Introductionunclassified

Investigation of the Effect of Using Ultrasonic Fuel System on Exhaust Emissions in a Spark Ignition Engine

ÖNER

ÖZTÜRK

Tanyeri

2022

Afyon Kocatepe University Journal of Sciences and Engineering

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“…An early injection at full load and a late injection at part-load can help to attain the mixture requirements to a certain extent. 6–8 However, the degree of homogeneity and stratification may not be adequate by changing injection timing alone. Buri et al 9 used high injection pressures (upto 1000 bar) in a spray-guided direct injection engine to improve the degree of stratification and extend the limit of stratified mode of operation at the high-load end.…”

Section: Introductionmentioning

confidence: 99%

A new injector concept for multimode operation in gasoline direct injection engines

Devassy

Bakshi

Ramesh

2013

International Journal of Engine Research

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A gasoline direct injection engine typically operates in multiple fuel preparation modes. In general, at higher loads, a homogeneous mixture is favored, whereas a stratified mixture is preferred at part-and low-load conditions. This is usually achieved by altering the injection parameters and injection strategy with respect to load and speed and through appropriate cylinder and piston geometries. In this article, a new injector concept has been proposed to aid attaining multiple modes in a gasoline direct injection engine. This is achieved by shaping the spray structure to suit the required mixture preparation. Detailed simulations are performed to assess the mixing process in a gasoline direct injection engine using the new injector. The charge preparation at the onset of ignition is studied for different injection modes of the same injector. The results indicate a significant improvement in the mixing process for different modes of operation.

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Effects of piston shapes and intake flow on the behavior of fuel mixtures in a GDI engine

Kang

Kim

2003

KSME International Journal

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Mixture Preparation for Direct-Injection SI Engines

Cited by 23 publications

References 4 publications

Investigation of the Effect of Using Ultrasonic Fuel System on Exhaust Emissions in a Spark Ignition Engine

Investigation of the Effect of Using Ultrasonic Fuel System on Exhaust Emissions in a Spark Ignition Engine

A new injector concept for multimode operation in gasoline direct injection engines

Effects of piston shapes and intake flow on the behavior of fuel mixtures in a GDI engine

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