This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Low Emission and Fuel Consumption Natural Gas Engines with High Power Density for Stationary and Heavy-Duty Application
Technical Paper
1999-01-2896
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Today, natural gas engines for stationary and vehicular applications are not only faced with stringent emission legislation, but also with increasing requirements for power density and efficient fuel consumption. For vehicular use, downsizing is an advantageous approach to lowering on-road fuel consumption and making gas engines more competitive with their diesel counterparts. In SI-engines, the power density at a given compression ratio is limited by knocking, or NOx emissions. A decrease in compression ratio, lowering both NOx emissions and the risk of knocking combustion, increases fuel consumption. An increase in air-fuel-ratio, required to avoid knocking at higher thermal loading, increases boost pressure, HC and CO emissions, and mechanical loading and causes the danger of misfiring. As a result, the performance of the latest production gas engines for vehicles remains at a BMEP of 18…20 bar with a NOx emission level of 2…5 g/kWh.
The key to increasing power density while keeping low NOx emission levels and high compression ratios is the combustion layout. The well-balanced relation between charge motion (both swirl and turbulence), temperature control via retarded ignition timing, and combustion velocity results in a specific power of BMEP = 30 bar, achieved in a prototype test engine, an increase by 50% compared with the baseline engine. In combination with downsizing, this can be used to reduce fuel consumption to levels thus far known only by diesel engines.
Recommended Content
| Technical Paper | Premixed-compression-ignition natural gas engine |
| Journal Article | Quasi-Dimensional Multi-Zone Combustion Diagnostic Tool for SI Engines with Novel NOx and CO Emissions Models |
| Technical Paper | Transient Control of a Dedicated EGR Engine |
Authors
Topic
Citation
Umierski, M., Körfer, T., and Stommel, P., "Low Emission and Fuel Consumption Natural Gas Engines with High Power Density for Stationary and Heavy-Duty Application," SAE Technical Paper 1999-01-2896, 1999, https://doi.org/10.4271/1999-01-2896.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 |
Also In
References
- Hupperich, P. Dürnholz, M. ‘Exhaust Emissions of Diesel, Gasoline and Natural Gas Fueled Vehicles ’ SAE Paper 960857
- Einang, P.M. ‘Medium Speed Lean Burn Gas Engines - Status and Development Trends’ FISITA 1996
- Sterlepper, J. HC-Emissionen und Flammenausbreitung im Feuerstegbereich beim Ottomotor RWTH Aachen 1993 in german
- Chmela, F. Kapus, P. Das TRI-FLOW Verbrennungsverfahren für den Magerbetrieb von Gasmotoren MTZ 55 1994 in german
- Einewall, P. Johansson, B. Combustion Chambers for Supercharged Natural Gas Engines SAE Paper 970221
- Johansson, B. Olsson, K. Combustion Chambers for Natural Gas SI Engines, Part 1 & 2 SAE-Paper 950469 & 950517
- Sakurai, T. et al. Basic Research on Combustion Chambers for Lean Burn Gas Engines SAE Paper 932710
- Brohmer, A. Berechnung des Brennverlaufs im Ottomotor unter Berücksichtigung von Einlaßströmung und Brennraumgeometrie RWTH Aachen 1987 in german
- Borrmeister, J. Hübner, W. Influence of combustion chamber shape on HC-Emission und den MTZ 58 1997
- Klüting, M. Spicher, U. Pischinger, F. Flammenausbreitung magerer Gemische in Brennräumen von Ottomotoren VDI Berichte 578 in german
- Czerwinski, J. Über die Zündung und Verbrennung im 4-Takt-Ottomotor mit unterteiltem Brennraum in german