This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of a High Efficiency, Low Emission SI-CNG Bus Engine
Annotation ability available
Sector:
Language:
English
Abstract
The development phases and test bench results related to the conversion of a bus Diesel engine of 6 cylinder 9.8 L displacement to an aftercooled turbocharged Spark Ignition (SI) compressed natural gas engine are reported. A pre-screening of various piston shapes was performed using the KMB CFD code to determine the most promising intake-chamber geometries according to computed mean flow and turbulence results. Then, the designed pistons were built for engine tests. Ignition characteristics, valve lift laws, bowl shape and swirl level were optimized to find the trade-off between efficiency and emissions. The finally retained solution reaches performances very close to the starting Diesel engine by running ultra lean (λ > 1.8) with a maximum thennal efficiency larger than 40% for a compression ratio of 12.5: 1. The complementary use of an efficient oxidizing catalyst allows nitrogen oxide emissions lower than lg/kWh for the European 13 mode cycle.
Recommended Content
Authors
Citation
Tilagone, R., Monnier, G., Chaouche, A., Baguelin, Y. et al., "Development of a High Efficiency, Low Emission SI-CNG Bus Engine," SAE Technical Paper 961080, 1996, https://doi.org/10.4271/961080.Also In
Alternative Fuel: Composition, Performance, Engines, and Systems
Number: SP-1181; Published: 1996-05-01
Number: SP-1181; Published: 1996-05-01
References
- Amsden, A.A. O'Rourke, T.D. Butler, T.D. “KIVA 2, a computer program for chemically reactive flows with sprays” Los Alamos National Laboratory report Los Alamos (USA) 1989
- Habchi, C. Torres, A. “A 3D multiblock structured version of the KIVA 2 code” Computational Fluid Dynamics '92 1 Hirsh et al. Elsevier Science Publishers 1992
- Johansson, B. Olsson, K. “Combustion Chambers for Natural Gas Sl Engines Part I: Fluid Flow and Combustion” SAE paper 950469 1995
- Olsson, K. Johansson, B. “Combustion Chambers for Natural Gas Sl Engines Part I: Combustion and Emissions” SAE paper 950517 1995
- Jones Kingston Heaton, M.G. “Nebula Combustion System for Lean Bum Spark Inited Gas Engines” SAE paper 890211 Detroit (USA) 1989
- Sakurai, T. Iko, M. Okamoto, K. Shoji, F. 1993 “Basic Research on Combustion Chambers for Lean Burn Gas Egines” SAE paper 932710 Detroit (USA) 1993
- Cartellieri, W. Chmela, F.G. Kapus, P.E. Tatschl, R.M. “Mechanisms leading to stable and efficient combustion in lean bum gas engines” International Symposium COMODIA Yokohama (Japon) 1994
- Le Coz, J.F. Henriot, S. Herrier, D. Marie, J.J. Barret, P. “Development of lean burn multi-valve S.I. engine: a new approach based on flow field optimization” 1991
- Henriot, S. Herrier, D. Le Coz, J.F. “Dévelopement d'un moteur 4 soupapes fonctionnant en mélange dilué” Revue de l'Institut Frangais du Pétrole 46 5 1991
- Le Coz, J.F. “Cycle to cycle correlation between flow field and combustion” SAE paper No 92051 Detroit (USA) 1992
- Tilagone R. Monnier G. Chaouche A. “Optimization of an ultra-low pollution bus engine running on compressed natural gas” International gas research conference Cannes (France) 1995