A wide range experimental and kinetic modeling study of the oxidation of 2,3-dimethyl-2-butene: Part 1

2,3-Dimethyl-2-butene (TME) is a potential fuel additive with high research octane number (RON) and octane sensitivity ( S ), which can improve internal combustion engine performance and efficiency. How-ever, the combustion characteristics of TME have not been comprehensively investigated. Thus, it is es-sential to study the combustion characteristics of TME and construct a detailed chemical kinetic model to describe its combustion. In this paper, two high-pressure shock tubes and a constant-volume reactor are used to measure ignition delay times and laminar flame speeds of TME oxidation. The ignition de-lay times were measured at equivalence ratios of 0.5, 1.0, and 2.0 in air, at pressures of 5 and 10 bar, in the temperature range of 950 - 1500 K. Flame speeds of the TME/ air mixtures were measured at atmospheric pressure, at a temperature of 325 K, for equivalence ratios ranging from 0.78 to 1.31. Two detailed kinetic mechanisms were constructed independently using different methodologies; the KAUST TME mechanism was constructed based on NUIGMech1.1, and the MIT TME mechanism was built us-ing the Reaction Mechanism Generator (RMG). Both mechanisms were used to simulate the experimental results using Chemkin Pro. In the present work, reaction flux and sensitivity analyses were performed us-ing the KAUST mechanism to determine the critical reactions controlling TME oxidation at the conditions studied.(c) 2023 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Automated summary

This study investigates the combustion characteristics of 2,3-dimethyl-2-butene (TME) and develops a detailed chemical kinetic model to describe its combustion. Measurements of ignition delay times and laminar flame speeds were conducted, and two kinetic mechanisms were constructed for simulating the experimental results.