首页|Decoupled analysis of the effect of hydroxyl functional groups on delay of ignition with fictitious hydroxyl
Decoupled analysis of the effect of hydroxyl functional groups on delay of ignition with fictitious hydroxyl
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NSTL
Elsevier
The delay of ignition (DOI) affects engine performances and the fundamental reasons that affect DOI have not been fully explained. In this paper, taking biodiesel mixed with methanol as an example, the effect of the hydroxyl (-OH) functional group in the fuel on the DOI was studied. Through thermogravimetric ana-lyzer and constant volume combustion chamber (CVCC), the activation energy and DOI of different blending ratios (0%, 10%, 20% and 30%) of biodiesel/methanol mixed fuel were determined. Using the fictitious hydroxyl (FOH-) method, the low-temperature oxidation of biodiesel/methanol/FOH- and the reaction path of ignition in the cylinder were analyzed. The results show that when the methanol blending ratio is less than 30%, as the blending concentration of FOH- groups increases, the low-temperature oxidation reaction activity of the mixed fuel increases, and the activation energy decreases. The physical and chemical effects of -OH can prolong and shorten DOI, respectively, and the influence of physical effects is more important than chemical effects. For every 10% increase in -OH functional group concentration, the DOI of biodiesel/methanol mixed fuel increases by 1.4%. (C) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.
Activation energyDelay of ignitionHydroxyl groupChemical reaction pathENGINE PERFORMANCEDIESEL COMBUSTIONCETANE NUMBERBIODIESELEMISSIONSSOOTBLENDS
NSTL
Elsevier
