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In-cylinder flow design based on the representative scales of turbulence and premixed combustion

Nissan Motor Co., Ltd.-Yuko Mito, Taisuke Shiraishi, Atsushi Teraji
  • Technical Paper
  • 2019-01-2210
Published 2019-12-19 by SAE International in United States
Dilution combustion with exhaust gas recirculation (EGR) has been applied for the improvement of thermal efficiency. In order to stabilize the high diluted combustion, it is important to form an appropriate turbulence in the combustion cylinder. Turbulent intensity needs to be strengthened to increase the combustion speed, while too strong turbulence causes ignition instability. In this study, the factor of combustion instability under high diluted conditions was analyzed by using single cylinder engine test, optical engine test and 3D CFD simulation. Finally, methodology of in-cylinder flow design is attempted to build without any function by taking into account the representative scales of turbulence and premixed combustion.
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Advanced Combustion Performance for High Efficiency in New I3 1.2L Supercharged Gasoline Engine by Effective Use of 3D Engine Simulation

Nissan Motor Company Ltd.-Yuko Mito, Kazuki Tanzawa, Michio Watanabe, Yuta Eiyama
Published 2012-04-16 by SAE International in United States
A new 1.2L inline 3-cylinder supercharged gasoline engine was developed to improve fuel efficiency and to meet EURO 5 emission regulations. The engine was designed with a high compression ratio, heavy exhaust gas recirculation (EGR), and a long stroke to improve fuel efficiency. The Miller cycle and a direct fuel injection system were applied to this engine in order to mitigate the occurrence of knock due to the high compression ratio. In addition, a supercharging system was adopted to compensate for the decline in charging efficiency due to the Miller cycle. The design of a direct injection gasoline engine involves a lot of problems such as reduction of oil dilution, stabilization of combustion at first idle retarded, improvement of air-fuel mixing homogeneity, and strengthening of the gas flow. It is hard to resolve these problems independently due to their complexities and difficult nature. Reducing wall wetting by the fuel spray can improve oil dilution in a small engine. Mixture homogeneity is an important factor for the knock control. Strong turbulence intensity helps to avoid unstable…
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Advanced Combustion Performance for High Efficiency in New I3 1.2L Supercharged Gasoline Engine by Effective Use of 3D Engine Simulation

Yuko Mito, Kazuki Tanzawa, Michio Watanabe, Yuta Eiyama
  • Technical Paper
  • 2011-08-0620
Published 2011-10-12 by Society of Automotive Engineers of Japan in Japan
This engine was developed to achieve good fuel efficiency. This engine employed high compression ratio, a large amount of EGR to improve fuel efficiency. In the design of direct injection gasoline engine, there are some problems such as reduction of oil dilution. It's hard to solve these problems independently due to their complexities. Effective use of 3D simulation tools led the success in the optimization of spray beam geometries and intake air control device shape from various requirements. Consequently, new engine achieved better fuel economy and was able to balance the trade-offs together with other performance features.
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An Experimental Study on the Effects of Combustion and Fuel Factors on DI Diesel Engine Performance

Hideaki Sugano, Yuko Mito, Yuta Mitsui, Jin Kusaka, Yasuhiro Daisho
  • Technical Paper
  • 2004-08-0375
Published 2004-10-27 by Society of Automotive Engineers of Japan in Japan
A single-cylinder, direct-injection diesel engine was used to investigate the effects of engine operating parameters and fuel factors on engine performance and emissions. Two combustion concepts were examined, including premixed charge compression ignition combustion by early fuel injection at low and medium loads and the conventional diesel combustion accompanied by post injection to enhance later part of combustion at heavy load. For this purpose, high pressure multiple injection was adopted together with EGR and supercharging, and a low cetane number fuel was compared with the ordinary diesel fuel. The engine test results indicate that combining engine parameters and cetane number should be optimized depending on the load to simultaneously ensure performance and reduce emissions.
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The Effect of Intake, Injection Parameters and Fuel Properties on Diesel Combustion and Emissions

Waseda University-Yuko Mito, Daisuke Tanaka, Seang Wock Lee, Yasuhiro Daisho, Jin Kusaka
Published 2003-05-19 by SAE International in United States
To improve urban air pollution, stringent emissions regulations for heavy-duty diesel engines have been proposed and will become effective in Japan, the EU, and the United States in a few years. To comply with such future regulations, it is critical to investigate the effects of intake and injection parameters and fuel properties on engine performance, efficiency and emissions characteristics, associated with the use of aftertreatment systems. An experimental study was carried out to identify such effects. In addition, the KIVA-3 code was used to gain insight into cylinder events. The results showed improvements in NOx-Smoke and BSFC trade-offs at high-pressure injection in conjunction with EGR and supercharging.
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