Laminar burning characteristics of coal-based naphtha
Laminar burning characteristics of coal-based naphtha
复制标题
DOI：
10.1016/j.combustflame.2023.112625
复制
发表时间：
2023-03
影响因子：
4.4
通讯作者：
Yuan-yi Xie;A. Lu;Jinzhou Li;Junfeng Yang;Chunhua Zhang;M. Morsy
中科院分区：
文献类型：
--
作者：
Yuan-yi Xie;A. Lu;Jinzhou Li;Junfeng Yang;Chunhua Zhang;M. Morsy
煤基石脑油符合能源替代标准，技术成熟、安全可靠，是一种很有前途的替代燃料。然而，其层流燃烧特性尚未得到很好的研究。用粒子成像测速仪（PIV）测量了一种煤基石脑油（c6.97142 2h15.88244）在一定初始条件下的层流燃烧速度和Markstein长度。此外，基于美国劳伦斯利弗莫尔国家实验室（LLNL）汽油动力学，提出了一种3组分替代燃料模型（62.4 mol%n-C6H14, 32.5 mol%i- c8h18和5.1 mol%i-C7H16），并根据测量的层流燃烧速度进行了验证。该模型能较好地模拟煤基石脑油燃料的层流燃烧速度。给出了Markstein数、临界Peclet数、临界Karlovitz数和归一化燃烧速度等无量纲参数，并由此探讨了热扩散（TD）、达里乌-朗道（DL）、热声不稳定性和拉伸效应之间的相关性。燃烧强度爆燃指数与Markstein长度呈负相关，也说明较低的拉伸效应有利于提高燃烧强度，从而提高实际燃烧室的放热率和效率。
Coal-based naphtha is a promising alternative fuel as it fits the standards of energy replacement and is technologically mature, safe, and dependable. However, its laminar combustion characteristics have not been well studied. The laminar burning velocities and Markstein lengths of a kind of coal-based naphtha (C6.97142H15.88244) over a range of initial conditions were measured by Particle Imaging Velocimetry (PIV) in spherical explosions. In addition, a 3-component surrogate fuel model (62.4 mol%n-C6H14, 32.5 mol%i-C8H18and 5.1 mol%i-C7H16) based on the Lawrence Livermore National Laboratory (LLNL) gasoline kinetics was proposed according to the detailed hydrocarbon analysis, and then validated against the measured laminar burning velocities. The proposed model performs reasonably well in simulating the laminar burning velocity of coal-based naphtha fuel. Dimensionless parameters including Markstein number, critical Peclet number, critical Karlovitz number and normalized burning velocity, were presented, from which the correlations between thermal diffusion (TD), Darrieus-Landau (DL), thermo-acoustic instabilities and stretch effects were explored. A negative correlation between the combustion intensity deflagration index and Markstein length also demonstrates that a lower stretch effect is favourable to increasing combustion intensity, hence increasing the heat release rate and efficiency of practical combustors.