Methane and Ethanol Ignition Behind Shock Waves

Nauka i Obrazovanie

E. Yu. Mikheyeva¹  N. A. Matveeva² 

[1] Joint Institute for High Temperatures of the Russian Academy of Sciences, Moscow;Bauman Moscow State Technical University, Moscow;

关键词: shock waves;    ignition;    hydrocarbons oxidation;    ethanol;    biofuels;   

DOI  :  10.7463/0417.0001147

来源: DOAJ

【 摘 要 】

Toughening environmental standards for concentration of emitting greenhouse gas (GHG) and soot particulates in combustion of the hydrocarbon fuels initiate development of new fuels. One of the perspectives for development is the partial or complete replacement of fossil fuels with biofuel. Alcohols and, in particular, ethanol are the promising types of biofuel. A number of publications experimentally show the use of ethanol as an additive to the traditional fuels in internal combustion engines with forced ignition and self-ignition. The paper carries out an experimental study of the ignition of stoichiometric mixtures of methane / oxygen, ethanol / oxygen and methane / ethanol / oxygen behind shock waves. The experiments were conducted in a shock tube of standard construction behind reflected shock waves in the range of temperatures and pressures, respectively, 1140-1825 K and 4.82-5.98 bars. The temperature dependences of the ignition delays were measured for mixtures of 3.3% CH4 + 6.7% O2 + Ar, 2.5% C2H5OH + 7.5% O2 + Ar, 1.5% CH4 + 1.5% C2H5OH + 7.5% O2 + Ar. It is shown that the addition of ethanol to the methane / oxygen mixture reduces a value of the ignition delays. A kinetic simulation of the ignition process of the combustible compositions under study was carried out. The experimental data were used to try out the kinetic mechanisms from the literature. For one mechanism, we failed to reach a good agreement with experimental data for all three variants of the mixtures studied. The paper analyses the change in the kinetic ways of ethanol consumption and formation in combustion of the ethanol-methane mixture and shows a disagreement between the existing kinetic mechanisms. The new experimental data obtained in the paper can further help when developing the kinetic mechanisms of combustion of various traditional fuel mixtures with alcohols, in particular, with ethanol.

【 授权许可】

Unknown