Simple Autoignition Model for the Derived Cetane Number of Oxygenated Compounds and Fuel Blends

Conference · Sun May 15 04:00:00 EDT 2022

OSTI ID:2331265

Witkowski, Dustin ^[1]; Groendyk, Michael; Rothamer, David

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1. University of Wisconsin Madison

A four-step autoignition model was used to derive an expression for the ignition delay and derived cetane number (DCN) measured by ignition quality testers (IQT) for oxygenated compounds and blends as a function of each compound’s global initiation and net chain branching rate constants. Expressions for these values were determined assuming they could be related to the functional groups present in a compound. Measurements for 124 compounds and 94 binary and ternary blends, gathered from the literature and performed at UW-Madison, were used to obtain the dependence of the measured ignition delay on each functional group. The new model was able to describe the ignition behavior of both the compounds and blends, with an average DCN error of 5.0 (22%) and 3.5 (15%), respectively. Additionally, the blend model was transformed into a mixing rule by incorporating existing IQT ignition delay data for each compound. Use of the mixing rule was found to offer improvements over the full prediction, with an average DCN error of 3.2 (14%).

• Research Organization: University of Wisconsin Madison
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO)
• DOE Contract Number: EE0008480
• OSTI ID: 2331265
• Country of Publication: United States
• Language: English