Numerical investigation and prediction models for methanol-air laminar flame speed

被引：0
|
作者：
Yang X. [1 ]
Shen W. [1 ]
Zhang Y. [1 ]
Zhang H. [1 ]
Zhang J. [1 ]
Lyu J. [1 ]
机构：
[1] Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 08期
关键词：
Kinetic modeling; Laminar flame speed; Methanol; Prediction model; Reaction kinetics; Simulation;
D O I：
10.11949/0438-1157.20181496
中图分类号：
学科分类号：
摘要：
The experimental data of the existing laminar flame velocity of methanol were collected and analyzed. The three typical chemical reaction mechanisms describing the oxidation of methanol (Li mechanism, USC Mech-Ⅱ and Burke mechanism) were compared to predict the propagation velocity of laminar flame. Laminar flame speed is an intrinsic property of a combustible mixture. In the present study, the validities and accuracies of three different chemical kinetic models (including Li scheme, USC Mech Ⅱ scheme and Burke scheme) on their predictions of laminar methanol-air flame speed were verified using newly-reported experimental data in the literature. The results show that the tested three kinetic schemes were able to qualitatively characterize the variation of the laminar flame speed of methanol-air mixtures. However, quantitatively, remarkable over-predictions were found between the computed laminar flame speed and experimental ones of fuel-rich mixtures. Consequently, reaction sensitivity analysis and reaction rate analysis were conducted in order to figure out the reason for the discrepancy. As per the kinetic analysis, the H-abstraction of methanol was found to be of great importance to the laminar flame speed. Consequently, the H-abstraction in Li scheme was updated using the newly-reported data, and the predictions of laminar flame speed using the modified Li scheme were greatly improved, especially on the fuel-rich side. In the engineering calculation, a quick estimation of the laminar flame speed with an acceptable accuracy is desired. Motivated by this demand, two empirical prediction correlations for methanol-air laminar flame speed were proposed. The predictions using the two correlations were in good agreement with the reported experimental data at different initial mixture temperatures and pressures. The calculation of the laminar flame speed of methanol-air mixtures using the proposed correlations is much faster than detailed modeling using full kinetic model so that it will save a large amount of computation resources in the engineering calculation. © All Right Reserved.
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页码：3011 / 3020
页数：9
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