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Laminar burning velocities at elevated pressures for gasoline and gasoline surrogates associated with RON

机译：RON和与RON相关的汽油和汽油替代物的高压层流燃烧速度

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The development and validation of a new gasoline surrogate using laminar flame speed as a target parameter is presented. Laminar burning velocities were measured using a constant-volume spherical vessel with ignition at the center of the vessel. Tested fuels included iso-octane, n-heptane, toluene, various mixtures of primary reference fuels (PRFs) and toluene reference fuels (TRFs) and three gasoline fuels of 70, 85 and 95 RON (FACE I, C and F) at the initial temperature of 358 K and pressures up to 0.6 MPa in the equivalence ratio ranging from 0.8 to 1.6. Normalized laminar burning velocity data were mapped into a tri-component mixture space at different experimental conditions to allocate different gasoline surrogates for different gasoline fuels, having RON of 70, 85 and 95. The surrogates of TRF-70-4 (17.94% iso-C-8-H-18 + 42.06% n-C-7-H-16 + 40% C7H8), TRF-85-1 (77.4% (so-C-8-H-18 + 17.6% n-C-7-H-16 + 5% C7H8), and TRF-95-1 (88.47% iso-C8H18 6.53% n-C7H16 + 5% C7H8) of RON 70, 85 and 95, respectively, are shown to successfully emulate the burning rate characteristics of the gasoline fuels associated with these RONs under the various experimental conditions investigated. An empirical correlation was derived to obtain laminar burning velocities at pressures that are experimentally unattainable as high as 3.0 MPa. Laminar burning velocities were comparable to the simulated values for lean and stoichiometric flames but they were relatively higher than the simulated values for rich flames. A flame instability assessment was conducted by determining Markstein length, critical Pecklet number, and critical Karlovitz number at the onset of flame instability. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：介绍了一种以层流火焰速度为目标参数的新型汽油替代物的开发和验证。使用恒定体积的球形容器测量层流燃烧速度，并在容器中心点火。被测试的燃料包括异辛烷，正庚烷，甲苯，主要参考燃料（PRF）和甲苯参考燃料（TRF）的各种混合物以及三种70、85和95 RON RON的汽油燃料（FACE I，C和F）。初始温度为358 K，压力最高为0.6 MPa，当量比为0.8至1.6。将归一化层流燃烧速度数据映射到不同实验条件下的三组分混合空间中，以为RON分别为RON 70、85和95的不同汽油燃料分配不同的汽油替代物。TRF-70-4（17.94％iso- C-8-H-18 + 42.06％nC-7-H-16 + 40％C7H8），TRF-85-1（77.4％（so-C-8-H-18 + 17.6％nC-7-H- RON分别为RON 70、85和95的16 + 5％C7H8）和TRF-95-1（88.47％iso-C8H18 6.53％n-C7H16 + 5％C7H8）成功地模拟了燃料的燃烧速率特性在各种实验条件下，与这些RONs关联的汽油燃料的经验相关性得到了实验上无法获得的高达3.0 MPa的压力下的层流燃烧速度，层流燃烧速度与稀薄和化学计量火焰的模拟值相当。它们比富火焰的模拟值相对要高。在火焰不稳定时确定Markstein长度，临界Pecklet数和临界Karlovitz数。 （C）2015年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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