Reduction of chemical kinetic mechanism for combustion of natural gas-diesel fuel with concentration of species as target parameter

被引：0
|
作者：
Li G. [1 ]
Tian F. [1 ]
Liang J. [1 ]
Zhang Z. [1 ]
机构：
[1] School of Energy and Power Engineering, Wuhan University of Technology, Wuhan
来源：
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2021年 / 49卷 / 10期
关键词：
Component mole fraction; Directed relation graph with error propagation method; Mechanism reduction; Surrogate model of liquefied natural gas-diesel(LNG) dual fuel; Threshold;
D O I：
10.13245/j.hust.211009
中图分类号：
学科分类号：
摘要：
The methane/n-heptane/iso-octane/cyclohexane/toluene mixture was selected as the surrogate model of liquefied natural gas-diesel dual fuel, and a detailed reaction mechanism consisting of 1 425 species and 5 597 reactions was established. A reduced reaction mechanism of the surrogate model of liquefied natural gas-diesel dual fuel was developed with species concentration as target parameter, based on the directed relation graph with error propagation method. The relationship between threshold and mechanism scale was analyzed, and the law of mechanism reduction was studied with reaction path analysis. Results show that with increase of the threshold, the scale of reduced mechanism decreases, while decreasing rate decreases gradually. When the threshold increases to 0.8, the scale of reduced mechanism is basically constant. Considering both of threshold and error, the determined reduced mechanism consists of 208 species and 1 087 reactions, which is capable of accurately predicting ignition delay times and laminar burning velocities of the surrogate fuel. The reaction path analysis shows that the reduced mechanism includes the core mechanism of H2/CO/C1, the semi-detailed mechanism of C2-C3 and the skeleton mechanism of C4-C8, with about 85% reduction of species and 81% reduction of reaction. © 2021, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.
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页码：53 / 59
页数：6
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