A Study on Combustion and Emission Characteristics of Small DI Diesel Engine Fuelled with Dimethyl Ether

The GREET Model Expansion for Well-to-Wheels Analysis of Heavy-Duty Vehicles

“…DME produces extremely low PM emissions because of its low auto-ignition temperature, its almost instantaneous vaporization when injected into the cylinder, its high oxygen content (35% by mass), and the absence of carbon-to-carbon bonds in its molecular structure (Jung et al, 2011). Thus, a dedicated DME vehicle might not require a particulate filter (Teng and McCandless, 2006;Zhang et al, 2008). Significant reductions in PM emissions were observed when a converted shuttle bus without an oxidation catalyst was operated on DMEdiesel blends, although there were increases in unburned HC, NO x and CO (Eirich et al, 2003).…”

“…A number of characteristics of DME-e.g., its higher evaporation latent heat, smaller actual dynamic fuel injection advanced angle, lower burning temperature, and higher achievable exhaust gas recirculation rate relative to diesel-would help DME vehicles meet the EPA's NO x emission standard, with potentially lower NO x than diesel (Teng and McCandless, 2006;Zhang et al, 2008). On the other hand, Jung et al (2011) found that DME exhibits higher NO x emissions than diesel, partly because its injection duration is longer.…”

Investigation on the fuel spray and emission reduction characteristics for dimethyl ether (DME) fueled multi-cylinder diesel engine with common-rail injection system

“…Most of which were based on using single-cylinder engines and mechanical injection pumps [17][18][19]. However, for electronically controlled DME fuel injection engines, supplying the DME to the engine is not easy, because the evaporation characteristics of DME differ from those of diesel, its lubricity is very low, and the properties of DME fuel caused dissolving of the sealing material.…”

A study on the control of NOx and particulate matter emissions from dimethyl ether combustion in compression ignition engines

“…At higher engine speeds; the lack of sufficient mixing time and hence incomplete combustion leads to higher HC and CO emission. Formaldehyde is a principal pollutant in DME combustion, but it decreases with an increase in injection pressure or advanced injection timing [63]. Accelerating the mixing process of DME with air will help to reduce NOx production as the natural mixing rate is slower than diesel with air [76].…”

“…DME combustion consists of pyrolysis and oxidation [59][60][61][62][63][64]. Auto-ignition in DME is obtained by decomposition of methoxymethyl (…”