An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures
An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures
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DOI：
10.1016/j.combustflame.2014.08.014
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发表时间：
2015-02-01
影响因子：
4.4
通讯作者：
Curran, Henry J.
中科院分区：
文献类型：
--
作者：
Burke, Ultan;Somers, Kieran P.;Curran, Henry J.
开发能够预测甲烷和二甲醚在常见燃烧环境（如压燃式发动机和燃气轮机）中的燃烧的精确化学动力学模型是重要的，因为它提供了在真实的燃烧室中难以研究且昂贵的条件下对这些燃料的有价值的数据和理解。在这项工作中，实验和化学动力学模型预测的点火延迟时间的数据提供了覆盖范围内的条件有关的气体涡轮机环境（T = 600-1600 K，p = 7-41大气压，φ = 0.3，0.5，1.0，和2.0的“空气”混合物）。详细的化学动力学模型（Mech_56.54）能够准确地预测这一广泛的数据，它是第一个机制，将高水平的速率常数测量和计算，其中可用于DME的反应。这一机理也是首次将压力依赖性处理应用于DME的低温反应。它已被验证使用现有的文献数据，包括流动反应器，射流搅拌反应器，激波管点火延迟时间，激波管形态，火焰速度，火焰形态的数据。新的点火装置。延迟时间测量甲烷，二甲醚，和它们的混合物，这些数据是使用三种不同的激波管和快速压缩机。除了DME/CH 4混合物，还获得了纯DME和纯甲烷的高压数据。在可能的情况下，将新数据与文献中的现有数据进行比较，结果一致。(C)2014年燃烧研究所。爱思唯尔公司出版All rights reserved.
The development of accurate chemical kinetic models capable of predicting the combustion of methane and dimethyl ether in common combustion environments such as compression ignition engines and gas turbines is important as it provides valuable data and understanding of these fuels under conditions that are difficult and expensive to study in the real combustors. In this work, both experimental and chemical kinetic model-predicted ignition delay time data are provided covering a range of conditions relevant to gas turbine environments (T = 600-1600 K, p = 7-41 atm, phi = 0.3, 0.5, 1.0, and 2.0 in 'air' mixtures). The detailed chemical kinetic model (Mech_56.54) is capable of accurately predicting this wide range of data, and it is the first mechanism to incorporate high-level rate constant measurements and calculations where available for the reactions of DME. This mechanism is also the first to apply a pressure-dependent treatment to the low-temperature reactions of DME. It has been validated using available literature data including flow reactor, jet-stirred reactor, shock-tube ignition delay times, shock-tube speciation, flame speed, and flame speciation data. New ignition. delay time. measurements are presented for methane, dimethyl ether, and their mixtures; these data were obtained using three different shock tubes and a rapid compression machine. In addition to the DME/CH4 blends, high-pressure data for pure DME and pure methane were also obtained. Where possible, the new data were compared with existing data from the literature, with good agreement. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.