LES/probability density function approach for the simulation of an ethanol spray flame

被引：43
|
作者：
Heye, Colin [1 ]
Raman, Venkat [1 ]
Masri, Assaad R. [2 ]
机构：
[1] Univ Texas Austin, Dept Aerosp Engn, Austin, TX 78712 USA
[2] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia
来源：
PROCEEDINGS OF THE COMBUSTION INSTITUTE | 2013年 / 34卷
基金：
美国国家科学基金会; 澳大利亚研究理事会;
关键词：
Large-eddy simulation; Probability density function; Flamelet/progress variable approach; Ethanol combustion; Droplet; LARGE-EDDY-SIMULATION; CONDITIONAL MOMENT CLOSURE; MODEL; EQUATIONS; SCHEME;
D O I：
10.1016/j.proci.2012.06.107
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A consistent probability density function (PDF) based combustion modeling approach for large eddy simulation of turbulent spray combustion is formulated. A Lagrangian Monte-Carlo approach for solving the PDF transport equation in the context of low-Mach number LES formulations is developed. The LES/PDF approach is used to simulate an experimental pilot-stabilized ethanol spray flame. In this particular flame, droplet evaporation occurs away from the flame front, leading to separation of the two processes. A high-temperature pre-flame zone with a stratified mixture is found to exist throughout the length of the flame. The high flow rate of the droplet-laden air prevents the flame front from propagating through this evaporated, but well-mixed fuel/air mixture. Comparison with experiments displayed large discrepancies concerning the droplet inflow conditions. In particular, the inflow turbulence is significantly modified by droplet-turbulence interactions in the injection pipe. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码：1633 / 1641
页数：9
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