This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Study of Performance and Combustion Characteristics of a DME-Fueled Light-Duty Direct-Injection Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 25, 1999 by SAE International in United States
Annotation ability available
A light-duty direct-injection diesel engine with dimethyl ether (DME) fuel was studied experimentally. The effects of fuel injection parameters and in-cylinder air motion, such as the pump plunger diameter, nozzle type, fuel injection timing, nozzle tip protrusion, nozzle opening pressure and swirl ratio, on performance and emissions of the DME engine were investigated. Cylinder pressure, needle valve lifts, and emissions were measured after optimization of the fuel-injection and combustion system parameters. By installing a low-pressure pump, a fuel pressure regulator, and a buffer in the fuel supply system, the vapor lock of DME in the fuel system is eliminated. The engine runs smoothly on DME over a wide range of speeds and loads. Thermal efficiency with DME fuel shows 3% higher than that with diesel fuel.
The measured injection delay with DME is longer than that with diesel fuel due to the lower acoustic velocity in the liquid DME. The ignition delay with DME, however, is much shorter than that with diesel fuel, resulting in much lower peak pressure and lower NOx emission. The maximum rate of pressure rise is equivalent to that of gasoline engine, resulting in lower combustion noise. The diffusion combustion of DME operation is much faster than that of a diesel engine. Oxygen in DME molecular reduces smoke, PM, hydrocarbon and carbon monoxide emissions.
The study demonstrates that DME is an excellent alternative fuel for compression ignition engines.
CitationLongbao, Z., Hewu, W., Deming, J., and Zuohua, H., "Study of Performance and Combustion Characteristics of a DME-Fueled Light-Duty Direct-Injection Diesel Engine," SAE Technical Paper 1999-01-3669, 1999, https://doi.org/10.4271/1999-01-3669.
- Shundoh S et al. The effect of injection parameter and swirl on diesel combustion with high pressure fuel injection. SAE paper 910489
- Durnholz M etal. Pre-injection a measure to optimize the emission behavior of DI-Diesel engine. SAE Paper 940674
- Baert R S G et al. New EGR technology relations HD diesel economy with 21st century emissions. SAE Paper 960848
- Thring R H Homogeneous-Charge Compression-Ignition(HCCI) engines. SAE Paper 892068
- Takeda Y et al. Emissions characteristics of premixed lean diesel combustion with extremely early staged fuel injection. SAE Paper 961163
- Longbao Zhou et al. An experimental study on the working stability and combustion characteristics of a direct injection diesel engine operating on multifuels. SAE Trasactions,90a940,503-512,1990
- Egeback et al. Experiences from the use of ethanol for heavy duty compression ignition engines. SAE Paper 931630
- Saeed et al. Combustion phenomena of alcohols in CI engines. ASME Transactions, Journal of Engineering for Gas Turbines and Power, 111,439-447,1989
- Sorenson, et al, Performance and Emissions of a 0.273 Liter Direct Injection Diesel Engine Fueled with Neat Dimethyl Ether” SAE Paper 950064
- Fieisch, et al, A New Clean Diesel Technology: Demonstration of ULEV emissions on a Navistar Diesel Engine Fueled with Dimethyl Ether” SAE Paper 950061
- Hansen, et al, Large Scale Manufacture of Dimethyl Ether - a New Alternative Diesel fuel from Natural Gas” SAE Paper 950063
- Kapus, et al, Development of Fuel Injection Equipment and Combustion System for DI Diesels Operated on Dimethyl Ether” SAE Paper 950062.