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Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 2: Analysis of Combustion Phenomena and NOx Formation by Numerical Simulation with Experiment
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Abstract
An experimental and a numerical analysis wereconducted based on the concept of homogeneous charge diesel combustion (HCDC), in which most of the fuel is supplied for pre-mixed homogeneous charge which is compressed in the cylinder and then ignited by small amount of diesel fuel directly injected into a cylinder.
At the previous report, It was indicated that simultaneous improvement of NOx and smoke were possible. Especially under a certain condition, NOx was extremely reduced.
This report describes the preliminary analysis for the cause of this emission improvement with HCDC method.
As result, direct optical observation of the combustion phenomena and numerical analysis using KIVA2 code suggested that low NOx combustion may be caused by lowered combustion temperature and reduced combustion period due to the uniform lean combustion.
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Ishii, H., Koike, N., Suzuki, H., and Odaka, M., "Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 2: Analysis of Combustion Phenomena and NOx Formation by Numerical Simulation with Experiment," SAE Technical Paper 970315, 1997, https://doi.org/10.4271/970315.Also In
References
- Ryan T. III Callahan T. J. “Homogeneous Charge Compression Ignition of diesel Fuel” SAE paper 961160
- Takeda Y. Nakagome K. Niimura K. “Emission Characteristics of Premixed Lean Diesel Com ustion with Extremely Early Staged Fuel Injection” SAE paper 961163
- Thring R. H. “Homogeneous-Charge Compression-Ignition (HCCI) Engines” SAE paper 892068
- Najt P. M. Foster D. E. “Compression-Ignited Homogeneous Charge Combustion” SAE paper 830264
- Suzuki H. Koike N. Ishii H. Odaka M. “Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part1: Experimental Investigation of Combustion and Exhaust Emission Behavior under Pre-mixed Homogeneous Charge Compression Ignition Method” SAE 1997 International Congress and Exposition
- Amsden A. A. et al. “KIVA- II:A Computer Program for Chemically Reactive Flows with Sprays,” Los Alamos National Labs. 1989