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Cylinder to Cylinder Variation Related to Gas Injection Timing on a Dual-Fuel Engine
Technical Paper
2019-01-1162
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The natural gas/diesel dual-fuel engine is an interesting technique to reduce greenhouse gas emission. A limitation of this concept is the emission of un-combusted methane. In this study we analyzed the influence of PFI gas-injection timing on cylinder to cylinder gas-distribution, and the resulting methane emissions. This was done on a 6 cylinder HD engine test bench and in a GT-power simulation of the same engine. The main variable in all tests was the timing of the intake port gas injection, placed either before, after, or during the intake stroke. It showed that injecting outside of the intake window resulted in significant variation of the amount of trapped gaseous fuel over the 6 cylinders, having a strong impact on methane emissions. Injecting outside of the intake stroke results in gas awaiting in the intake port. Both testing and simulation made clear that as a result of this, cylinder 1 leans out and cylinder 6 enriches. The simulation showed how this is caused by the airflow into the manifold, which enters the manifold close to cylinder 1. This flow picks up gas residing before the first cylinders, and distributes it over the cylinders further downstream. The richer cylinders have a higher absolute methane emission. By calculating the ratio between trapped and emitted methane, we found operating points where the enrichment caused by unequal gas distribution led to lower relative methane emission. This can be attributed to the better combustibility of methane under richer conditions. Although the injection timing was placed outside the intake window on purpose in our experiments, the same distribution problem occurs in situations where the gas injection is longer than the intake stroke. This is a common situation with currently available dual-fuel systems. The solution can be found in a gas injection system with significantly higher capacity.
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Merts, M., Pet, Q., Mesman, P., and Verhelst, S., "Cylinder to Cylinder Variation Related to Gas Injection Timing on a Dual-Fuel Engine," SAE Technical Paper 2019-01-1162, 2019, https://doi.org/10.4271/2019-01-1162.Data Sets - Support Documents
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References
- Karim , G.A. Dual-Fuel Diesel Engines CRC Press 2015
- Forster , P. et al. Changes in Atmospheric Constituents and in Radiative Forcing Chapter 2 United Kingdom Cambridge University Press 2007
- CIMAC WG17 2014
- Merts , M. , Pet , Q. , and Mesman , P. A Comparison of Dual Fuel Engine Simulation and Dyno Testing presented at the EAEC 2017 Madrid 2017 vol. 15th
- Sremec , M. , Taritaš , I. , Sjerić , M. , and Kozarac , D. Numerical Investigation of Injection Timing Influence on Fuel Slip and Influence of Compression Ratio on Knock Occurrence in Conventional Dual Fuel Engine Journal of Sustainable Development of Energy, Water and Environment Systems 5 4 518 532 2017
- Kassa , M. , Hall , C. , Ickes , A. , and Wallner , T. Cylinder-to-Cylinder Variations in Power Production in a Dual Fuel Internal Combustion Engine Leveraging Late Intake Valve Closings SAE Int. J. Engines 9 2 2016
- Kassa , M. , Hall , C. , Ickes , A. , and Wallner , T. Modeling and Control of Fuel Distribution in a Dual-Fuel Internal Combustion Engine Leveraging Late Intake Valve Closings International Journal of Engine Research 18 8 797 809 2017
- Garcia , P. and Tunestal , P. Experimental Investigation on CNG-Diesel Combustion Modes under Highly Diluted Conditions on a Light Duty Diesel Engine with Focus on Injection Strategy SAE Int. J. Engines 8 5 2015
- Chen , Z. et al. The Impact of Methanol Injecting Position on Cylinder-to-Cylinder Variation in a Diesel Methanol Dual Fuel Engine Fuel 191 150 163 2017
- Yang , B. , Xi , C. , Wei , X. , Zeng , K. , and Lai , M.-C. Parametric Investigation of Natural Gas Port Injection and Diesel Pilot Injection on the Combustion and Emissions of a Turbocharged Common Rail Dual-Fuel Engine at Low Load Applied Energy 143 130 137 2015
- Hernandez , J.J. , Lapuerta , M. , Serrano , C. , and Melgar , A. Estimation of the Laminar Flame Speed of Producer Gas from Biomass Gasification Energy & Fuels 19 5 2172 2178 2005
- Liao , S.Y. , Jiang , D.M. , and Cheng , Q. Determination of Laminar Burning Velocities for Natural Gas Fuel 83 9 1247 1250 2004
- Taylor , J.R. An Introduction to Error Analysis Sausalito, Calif University Science Books 1997
- Tänzler , A.G. Experimentelle Untersuchung eines Dual-Fuel-Brennverfahrens für schwere Nutzfahrzeugmotoren Wiesbaden Springer Fachmedien Wiesbaden 2017