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Approaches to Solve Problems of the Premixed Lean Diesel Combustion
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1999 by SAE International in United States
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Previous research in our laboratory has shown that NOx emissions can be sharply reduced by PREDIC (PRE-mixed lean DIesel Combustion), in which fuel is injected very early in the compression process. However some points of concern remained unsolved, such as a large increase in THC and CO, higher fuel consumption, and an operating region narrowly limited to partial loads, compared to conventional diesel operation.
In this paper, the causes of PREDIC's problem areas were analyzed through engine performance tests and combustion observation with a single cylinder engine, through fuel spray observation with a high-pressure vessel, and through numerical modeling. Subsequently, measurable improvements were achieved on the basis of these analyses.
As a result, the ignition and combustion processes were clarified in terms of PREDIC fuel-air mixture formation. Thus, THC and CO emissions could be decreased by adopting a pintle type injection nozzle, or a reduced top-land-crevice piston. Fuel consumption was also improved by application of EGR or the addition of an oxygenated component to the diesel fuel. The operating region could be extended to higher load conditions by MULtiple stage DIesel Combustion (MULDIC), in which the first stage combustion corresponds to PREDIC. Furthermore, by combining PREDIC at low loads with MULDIC at high loads, Japanese Diesel 13 Mode NOx emissions could be reduced to 1 g/kWh.
- Hisashi Akagawa - New ACE Institute Co., Ltd.
- Takeshi Miyamoto - New ACE Institute Co., Ltd.
- Akira Harada - New ACE Institute Co., Ltd.
- Satoru Sasaki - New ACE Institute Co., Ltd.
- Naoki Shimazaki - New ACE Institute Co., Ltd.
- Takeshi Hashizume - New ACE Institute Co., Ltd.
- Kinji Tsujimura - New ACE Institute Co., Ltd.
CitationAkagawa, H., Miyamoto, T., Harada, A., Sasaki, S. et al., "Approaches to Solve Problems of the Premixed Lean Diesel Combustion," SAE Technical Paper 1999-01-0183, 1999, https://doi.org/10.4271/1999-01-0183.
- Ryan T.W. III “Homogeneous Charge Compression Ignition of Diesel Fuel,” SAE Paper 961160 1996
- Suzuki, H. Koike N. Ishii H. Odaka M. “Exhaust Purification of Diesel Engines with Homogeneous Charge Compression Ignition Method (Part1) Investigation of Combustion and Exhaust Emission Behavior Under Premixed Homogeneous Charge Combustion Method,” SAE Paper 970313 1997
- Yanagihara, H. Sato Y. Ohoki H. Takahashi K. “A Study of DI Diesel Engine Combustion under Uniform and Highly Dispersed Mixture Formation,” JSAE Spring Convention Proceedings 984 1998 9 12
- Takeda, Y. Nakagome K. Niimura K. “Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection,” SAE Paper 961163 1996
- Nakagome, K. Shimazaki N. Niimura K. Kobayashi S. “Combustion and Emission Characteristics of Premixed Lean Diesel Combustion Engine,” SAE Paper 970898 1997
- Miyamoto T. Hayashi A. K. Harada A. Sasaki S. Akagawa H. Tsujimura K. “Numerical Simulation of Premixed Lean Diesel Combustion in a DI Engine,” The Fourth International Symposium COMODIA 98 1998 173 177
- Hrada A. Shimazaki N. Sasaki S. Miyamoto T. Akagawa H. Tsujimura K. “The Effects of Mixture Formation on Premixed Lean Diesel Combustion,” SAE Paper 980553 1998
- Hashizume T Miyamoto T. Akagawa H. Tsujimura K. “Combustion and Emission Characteristics of Multiple Stage Diesel Combustion,” SAE Paper 980505 1998