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An Experimental Study of Injection and Combustion with Dimethyl Ether
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
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DiMethyl Ether (DME) has been known to be an outstanding fuel for combustion in diesel cycle engines for nearly twenty years. DME has a vapour pressure of approximately 0.5MPa at ambient temperature (293K), thus it requires pressurized fuel systems to keep it in liquid state which are similar to those for Liquefied Petroleum Gas (mixtures of propane and butane). The high vapour pressure of DME permits the possibility to optimize the fuel injection characteristic of direct injection diesel engines in order to achieve a fast evaporation and mixing with the charged gas in the combustion chamber, even at moderate fuel injection pressures.
To understand the interrelation between the fuel flow inside the nozzle spray holes tests were carried out using 2D optically accessed nozzles coupled with modelling approaches for the fuel flow, cavitation, evaporation and the gas dynamics of 2-phase (liquid and gas) flows. And to understand the spray characteristics tests were carried out using constant volume vessel. For a spray observation, two methods were used a shadowgraph and a diffuse forward scatter method to obtain both gaseous phase and liquid phase of DME. Tests were then run on a single cylinder engine to determine the differences in combustion with the differing hole shapes as well as extra high injection pressure.
Results showed that the different nozzle hole shapes changed the flow and the cavitation tendency. And these characteristics be utilized for an optimaization of the spray and combustion
CitationSasaki, S., Kato, M., Yokota, T., Konno, M. et al., "An Experimental Study of Injection and Combustion with Dimethyl Ether," SAE Technical Paper 2015-01-0932, 2015, https://doi.org/10.4271/2015-01-0932.
- Fleisch, T., McCarthy, C., Basu, A., Udovich, C. et al., “A New Clean Diesel Technology: Demonstration of ULEV Emissions on a Navistar Diesel Engine Fueled with Dimethyl Ether,” SAE Technical Paper 950061, 1995, doi:10.4271/950061.
- Sorenson, S. and Mikkelsen, S., “Performance and Emissions of a 0.273 Liter Direct Injection Diesel Engine Fuelled with Neat Dimethyl Ether,” SAE Technical Paper 950064, 1995, doi:10.4271/950064.
- Kapus, P. and Ofner, H., “Development of Fuel Injection Equipment and Combustion System for DI Diesels Operated on Dimethyl Ether,” SAE Technical Paper 950062, 1995, doi:10.4271/950062.
- Ofner, H., Gill, D., and Krotscheck, C., “Dimethyl Ether as Fuel for CI Engines - A New Technology and its Environmental Potential,” SAE Technical Paper 981158, 1998, doi:10.4271/981158.
- Teng, H., McCandless, J., and Schneyer, J., “Thermodynamic Properties of Dimethyl Ether - An Alternative Fuel for Compression-Ignition Engines,” SAE Technical Paper 2004-01-0093, 2004, doi:10.4271/2004-01-0093.
- Gill, D., Ofner, H., Schwarz, D., Sturman, E. et al., “The Performance of a Heavy Duty Diesel Engine with a Production Feasible DME Injection System,” SAE Technical Paper 2001-01-3629, 2001, doi:10.4271/2001-01-3629.
- Kato, M., Takeuchi, H., Koie, K., Sekijima, H. et al., “A Study of Dimethyl Ether(DME) Flow in Diesel Nozzle,” SAE Technical Paper 2004-01-0081, 2004, doi:10.4271/2004-01-0081.
- Japan DME Forum:DME Handbook Chapter5.3
- Kato, M. Yokota, T., Weber, J., Konno, M., Winklhofer, E., Wieser, K., Ofner, H., Walter, G.,: An Investigation of Injection and Combustion of Dimethylether Using High Pressure Injection System; Division of Energy & Fuels American Chemical Society Symposium 248th ACS National Meeting & Exposition, No29184
- Konno, M., Chiba, K., and Okamoto, T., “Experimental and Numerical Analysis of High Pressure DME Spray,” SAE Technical Paper 2010-01-0880, 2010, doi:10.4271/2010-01-0880.