Many studies of DiMethyl Ether (DME) as an alternative fuel in Compression-Ignition (CI) engines have been performed. Although diverse DME engine research has been conducted, the investigation of combustion behavior and temperature distribution in the combustion engine has not progressed due to the fact that there is no sooting flame in DME combustion. In order to investigate the combustion characteristics in this study, the KIVA-3 V code was implemented to research various pilot injection

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... egies on a single-cylinder CI engines with DME and Ultra-Low-Sulfur Diesel (ULSD) fuels. The combustion distribution results obtained from the numerical investigation were validated when compared with the measurement of flame temperature behaviors in the experimental approach. This study showed that long intervals between two injection timings enhanced pilot combustion by increasing the ambient pressure and temperature before the start of the main combustion. Different atomization properties between DME and ULSD fuels contributed to the formation of a fuel-air mixture at the nozzle tip and piston lip regions, separately, which strongly affected the temperature distribution of the two fuels. In addition, the pilot injection timing played a vital role in regard to ignition delay and peak combustion temperatures. Exhaust emissions, such as NO x and soot, are related to the local equivalence ratio and temperature in the combustion chamber, also illustrated by the contrary result on a U (equivalence ratio) -T (temperature) map. Re´sume´-Effet des re´glages a'l'injection sur la re´partition de la tempe´rature de combustion dans un moteur monocylindre a'allumage par compression et alimente´avec du DME et du Diesel a'ultra basse teneur en soufre -De nombreuses e´tudes concernant le dime´thyle´ther (DME) en tant que carburant alternatif dans des moteurs a'allumage par compression (CI) ont e´te´effectue´es. Bien que diffe´rentes recherches sur les moteurs DME aient e´te´re´alise´es, l'e´tude du comportement a'la combustion et des re´partitions de tempe´rature dans le moteur ac ombustion n'a pas progresse´du fait qu'il n'existe aucune flamme d'encrassement lors de la combustion du DME. Afin d'e´tudier dans le pre´sent travail les caracte´ristiques de combustion, le code KIVA-3 V a e´te´applique´pour rechercher diffe´rentes strate´gies d'injection pour des moteurs CI monocylindres avec comme carburants du DME et du Diesel a'teneur en soufre