This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Combustion and Emission Characteristics of Multiple Stage Diesel Combustion
Annotation ability available
Sector:
Language:
English
Abstract
A new diesel combustion concept termed MULDIC (MUL-tiple stage DIesel Combustion), which can reduce NOx emissions at high load conditions, was studied by means of engine tests, combustion observation, and numerical simulation. In MULDIC, the first stage combustion corresponds to premixed lean combustion, and the second stage combustion corresponds to diffusion combustion under high temperature and low oxygen conditions.
The engine tests showed that simultaneous reduction of NOx and smoke could be obtained with MULDIC operation, even at an excess air ratio of 1.4. Fuel consumption was higher compared to conventional operation because of premature ignition of the first stage combustion and extremely late second stage injection. However, optimization of the first stage combustion increased the degree of constant volume combustion, and hence the thermal efficiency was increased. Therefore, NOx emissions from MULDIC were reduced to less than half the values from conventional diesel combustion at the same fuel consumption. In-cylinder combustion observation was carried out in order to clarify MULDIC smoke emission characteristics. In these photographs, a highly sooting luminous flame was observed because the ignition delay was short. This luminous flame disappeared quickly, and since the cylinder temperature was very high, most of the soot oxidized rapidly. Thus, low smoke combustion was obtained.
Recommended Content
Authors
Citation
Hashizume, T., Miyamoto, T., Hisashi, A., and Tsujimura, K., "Combustion and Emission Characteristics of Multiple Stage Diesel Combustion," SAE Technical Paper 980505, 1998, https://doi.org/10.4271/980505.Also In
References
- Yanagihara, H. Sato Y. Mizuta J. “A Study of DI Diesel-Combustion under Uniform-Higher Dispersed Mixture Formation,” The 13th Internal Combustion Engine Symposium Lecture Paper 365 369 1996
- Suzuki, H. Koike N. Ishii H. Odaka M. “Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 1: Experimental Investigation of Combustion and Exhaust Emission Behavior Under Pre-Mixed Homogeneous Charge Compression Ignition Method,” SAE Paper 970313 1997
- Ishii, H. Koike N. Suzuki H. Odaka M. “Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 1: Analysis of Combustion Phenomena and NOx Formation by Numerical Simulation with Experiment,” SAE Paper 970315 1997
- Takeda, Y. Nakagome K. Niimura K. “Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel Injection,” SAE Paper 961163 1996
- Takeda, Y. Komori M. Tsujimura K. “Diesel Emission Reduction Using Rich Mixture Combustion Chamber with High Pressure Fuel Injection,” The 71st Annual Fall JSME Meeting October 1993 234 236
- Chikahisa, T. Murayama T. Konno M. “Two-stage Combustion with a Turbulence Generation System for Reducing NOx and Smoke Emitted from DI Diesel Engines,” Proceedings of the 8th International Pacific Conference on Automotive Engineering 2 93 98 1995
- Kobori, S. Kamimoto T. “A Study on High Temperature Two-stage Combustion for a Diesel Engine with Air-cell,” JSAE Lecture Proceedings 945 33 36 1994
- Amsden, A.A. O'Rourke P.J. Butler T.D. “KIVA-II: A Computer Program for Chemically Reactive Flows with Sprays,” Los Alamos National Laboratory Report 1989
- Naber, J.D. Reitz R.D. “Modeling Engine Spray/Wall Impingement,” SAE Paper 880107 1987
- Magnussen, B.F. Hjertager B.H. “On Mathematical Modeling of Turbulent Combustion with Special Emphasis on Soot Formation and Combustion,” 16th Symposium (Int.) on Combustion The Combustion Institute 1976
- Miyamoto, T. Nakagome K. Akagawa H. “Computational Prediction of NOx Reduction in a Premixed Lean Diesel Combustion Engine,” The 74th Annual JSME Meeting April 1997 132 133
- Gosman, A.D. Harvey P.S. “Computer Analysis of Fuel Air Mixing and Combustion in Axisymmetric D.I. Diesel,” SAE Paper 820036 1982