Influences of diesel pilot injection on ethanol autoignition - a numerical analysis

CAR2017 International Congress of Automotive and Transport Engineering - Mobility Engineering and Environment

工业技术;运输工程

Burnete, N.V.^1 ; Burnete, N.^1 ; Jurchis, B.^1 ; Iclodean, C.^1

Technical Univeristy of Cluj-Napoca, Faculty of Mechanics, Department of Automotive Engineering and Transports, Str. Muncii 103-105, Cluj-Napoca, Romania^1

关键词: Burning velocity;    Combustion pro-cess;    Constant-volume combustions;    High temperature;    Lower temperatures;    Peak temperatures;    Pollutant emission;    Vaporization enthalpies;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/252/1/012066/pdf
DOI  :  10.1088/1757-899X/252/1/012066

学科分类：工业工程学

来源: IOP

【 摘 要 】

The aim of this study is to highlight the influences of the diesel pilot quantity as well as the timing on the autoignition of ethanol and the pollutant emissions resulting from the combustion process. The combustion concept presented in this paper requires the injection of a small quantity of diesel fuel in order to create the required autoignition conditions for ethanol. The combustion of the diesel droplets injected in the combustion chamber lead to the creation of high temperature locations that favour the autoignition of ethanol. However, due to the high vaporization enthalpy and the better distribution inside the combustion chamber of ethanol, the peak temperature values are reduced. Due to the lower temperature values and the high burning velocity of ethanol (combined with the fact that there are multiple ignition sources) the conditions required for the formation of nitric oxides are not achieved anymore, thus leading to significantly lower NOx emissions. This way the benefits of the Diesel engine and of the constant volume combustion are combined to enable a more efficient and environmentally friendly combustion process.