Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation

doi:10.1016/S1004-9541(14)60011-2

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (2): 214-220.DOI: 10.1016/S1004-9541(14)60011-2

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Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation

LI Ke^1,2, ZHOU Lixing^1,3

1 Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;
2 School of Energy and Environment, Inner Mongolian University of Science and Technology, Baotou 014010, China;
3 Department of Applied Mathematics, Hong Kong Polytecnic University, Hong Kong 999077, China

Received:2011-05-11 Revised:2012-05-16 Online:2014-01-28 Published:2014-02-05
Contact: ZHOU Lixing
Supported by:
Supported by the National Natural Science Foundation of China (5073600, 51266008) and the Research Grant Council of Hong Kong (5105/08E, B-Q10H).

Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation

李科^1,2, 周力行^1,3

1 Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;
2 School of Energy and Environment, Inner Mongolian University of Science and Technology, Baotou 014010, China;
3 Department of Applied Mathematics, Hong Kong Polytecnic University, Hong Kong 999077, China

通讯作者: ZHOU Lixing
基金资助:
Supported by the National Natural Science Foundation of China (5073600, 51266008) and the Research Grant Council of Hong Kong (5105/08E, B-Q10H).

Abstract

Abstract: Large-eddy simulation of spray combustion is under its rapid development. Different combustion models were used by different investigators. However, these models are less validated by detailed experimental data. In this paper, large-eddy simulation (LES) of ethanol spray-air combustion was made using an Eulerian-Lagrangian approach, a subgrid-scale kinetic energy stress model, and a filtered finite-rate combustion model, neglecting the sub-grid scale reaction rate. The simulation results are compared with experimental dada in the literature and validated in detail. The LES obtained statistically averaged gas temperature is in much better agreement with the experimental results than Reynolds averaged (RANS) modeling using the most complex probability density function (PDF) equation combustion model. The instantaneous LES results show the coherent structures of the shear region near the high-temperature flame zone and the fuel vapor concentration map, indicating that the droplets are concentrated in this shear region. The instantaneous temperature, oxygen and carbon dioxide concentration maps show the close in-teraction between the coherent structures and the combustion reaction.

Key words: ethanol-air two-phase flow, spray combustion, large-eddy simulation

摘要： Large-eddy simulation of spray combustion is under its rapid development. Different combustion models were used by different investigators. However, these models are less validated by detailed experimental data. In this paper, large-eddy simulation (LES) of ethanol spray-air combustion was made using an Eulerian-Lagrangian approach, a subgrid-scale kinetic energy stress model, and a filtered finite-rate combustion model, neglecting the sub-grid scale reaction rate. The simulation results are compared with experimental dada in the literature and validated in detail. The LES obtained statistically averaged gas temperature is in much better agreement with the experimental results than Reynolds averaged (RANS) modeling using the most complex probability density function (PDF) equation combustion model. The instantaneous LES results show the coherent structures of the shear region near the high-temperature flame zone and the fuel vapor concentration map, indicating that the droplets are concentrated in this shear region. The instantaneous temperature, oxygen and carbon dioxide concentration maps show the close in-teraction between the coherent structures and the combustion reaction.

关键词: ethanol-air two-phase flow, spray combustion, large-eddy simulation

LI Ke, ZHOU Lixing, CHAN C.K.. Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation[J]. Chin.J.Chem.Eng., 2014, 22(2): 214-220.

李科, 周力行. Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation[J]. Chinese Journal of Chemical Engineering, 2014, 22(2): 214-220.

References

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[1]	ZHOU Lixing, HU Liyuan. Advances in LES of Two-phase Combustion(Ⅱ) LES of Complex Gas-Particle Flows and Coal Combustion [J]. Chin.J.Chem.Eng., 2012, 20(4): 609-616.
[2]	ZHOU Lixing, LI Ke, WANG Fang. Advances in Large-eddy Simulation of Two-phase Combustion (I) LES of Spray Combustion [J]. Chin.J.Chem.Eng., 2012, 20(2): 205-211.
[3]	YANG Min, ZHOU Lixing, L. S. Fan. Large-eddy Simulation of Bubble-Liquid Confined Jets [J]. , 2002, 10(4): 381-384.

Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation

Large-eddy Simulation of Ethanol Spray-Air Combustion and Its Experimental Validation

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