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

摘要

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.