This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Investigations on The Influence of Ignition Voltage, Higher Compression Ratio and Piston Crown Geometry on the Performance of Compressed Natural Gas Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 23, 2008 by SAE International in United States
Annotation ability available
The increasing demand of passenger fleet with the depletion of conventional fuels has resulted into a massive research for harnessing the potentials in alternate fuels. Vis-à-vis, compressed natural gas (CNG) has been a proven clean automotive fuel and is playing a vital role towards the development of new engine concepts or in terms of retrofits. With vast CNG reservoirs present in over 90 countries worldwide, CNG as an alternate auto fuel has been drawing a greater attention.
CNG has a very high octane rating and hence can be operated to run under the Highest Useful Compression Ratio (HUCR), thus seeming more applicable under both SI and CI mode. CNG engines desire a compact and turbulent combustion chamber owing to its lower laminar flame propagation characteristics and hence desire proper mixing of air and fuel as well for the flame to propagate to the end charge, making it inevitable to develop piston geometries that can develop turbulence inside the combustion chamber. Thus, in an attempt to develop a dedicated CNG engine technology based on a series of experimental work and design carried out in the recent past, the present work is a carry forward of the experimentations conducted on a single cylinder 4 stroke cycle, 100 cc gasoline engine retrofit to run on CNG with successive modifications.
Three major aspects viz. the ignition voltage, compression ratio and the piston crown geometry is investigated in this report to evaluate the performances and emission characteristics on the engine and a comparison with gasoline is also made with the results obtained during the recent developmental stages. The authors found a major achievement in both performances as well as emissions on this 100 cc category of the Indian market. The performances improved by 20 - 30 % under certain cases with a considerable reduction in emissions in CNG itself and presently this system able to compete the conventional gasoline engine with reduced emissions.
CitationIyer, R., Vaggar, M., Seetharam, T., and Channiwala, S., "Investigations on The Influence of Ignition Voltage, Higher Compression Ratio and Piston Crown Geometry on the Performance of Compressed Natural Gas Engines," SAE Technical Paper 2008-01-1762, 2008, https://doi.org/10.4271/2008-01-1762.
- Johansson Bengt Olsson Krister “Combustion Chambers for Natural Gas SI Engines Part-I: Fluid Flow and Combustion” SAE paper no. 950469
- Cameron C Evans R.L “A New Combustion Chamber for Fast-Burn Applications” SAE 860319
- Einewall Patrik Bengt J “Combustion Chambers for Supercharged Natural Gas Engines” SAE paper no. 970221
- Tunestål Per Christensen Magnus Einewall Patrik Andersson Tobias Johansson Bengt “Hydrogen Addition For Improved Lean Burn Capability of Slow and Fast Burning Natural Gas Combustion Chambers” SAE 2002-01-2686
- Belchior Carlos R.P. “Analysis of Vehicles Converted From Gasoline to CNG Using Conversion Devises (Kits)” SAE 2001-01-3883
- de Risi Arturo Donateo Teresa Laforgia Domenico “Optimization of the Combustion Chamber of Direct Injection Diesel Engines” SAE 2003-01-1064
- Beroun Stanislav Martins Jorge “The Development of Gas (CNG, LPG and H2) Engines for Buses and Trucks and their Emission and Cycle Variability Characteristics” SAE 2001-01-0144
- Tilagone Richard Monnier Gaëtan “Development of a Lean-Burn Natural Gas-Powered Vehicle Based on a Direct-Injection Diesel Engine” SAE 2000-01-1950
- Shashikantha, Parikh P.P “Spark Ignition Producer Gas Engine and Dedicated Compressed Natural Gas Engine - Technology Development and Experimental Performance Optimisation” SAE 1999-01-3515
- Maji S. Ranjan Rakesh Sharma P.B “Comparison of Emissions and Fuel Consumption from CNG and Gasoline Fueled Vehicles - Effect of Ignition Timing” SAE 2000-01-1432
- Iyer Rajesh C. Shrikanth Sakhare L Seetharam T.R Channiwala S.A “Influence of Piston Crown Geometry for Compressed Natural Gas SI Engines: Performance Evaluation and Emissions” EAEC 2007, 11th European Automotive Congress May 30 June 1 2007 Budapest, Hungary