Abstract
Dimethyl Ether (DME) is a possible clean substitute to diesel for CI engines. A computational study was done to understand the influence of time of injection on performance and emissions from a DME based CI engine. Due to the symmetry of the engine, the simulations were conducted on a 60o sector of the cylinder from closure of intake valve to opening of exhaust valve. The start of fuel injection (SOI) time was varied from -25obTDC to -2obTDC. Simulated results for pressure traces, heat release rates, IMEP, and CO and NO emissions are presented. Maximum IMEP was obtained for SOI of -2obTDC, and it decreased with advanced injection. The decrease was small up to advance of -10obTDC. NO emissions peaked around SOI of -10obTDC to -15obTDC. In contrast, CO emissions showed an opposite trend.
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