Simulation of Partially Premixed Lifted Flame Based on Unsteady Flamelet/Progress Variable Approach of LES

Journal of Propulsion Technology ›› 2017, Vol. 38 ›› Issue (1): 148-157.

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Simulation of Partially Premixed Lifted Flame Based on Unsteady Flamelet/Progress Variable Approach of LES

School of Power and Energy，Northwestern Polytecnical University，Xi’an 710072，China,Science and Technology on Scramjet Laboratory，Hypervelocity Aerodynamics Institute，CARDC， Mianyang 621000，China,Science and Technology on Scramjet Laboratory，Hypervelocity Aerodynamics Institute，CARDC， Mianyang 621000，China,School of Power and Energy，Northwestern Polytecnical University，Xi’an 710072，China,Science and Technology on Scramjet Laboratory，Hypervelocity Aerodynamics Institute，CARDC， Mianyang 621000，China and Science and Technology on Scramjet Laboratory，Hypervelocity Aerodynamics Institute，CARDC， Mianyang 621000，China

Published:2021-08-15

基于LES的非稳态火焰面/反应进度变量方法模拟部分预混抬举火焰

熊模友¹,乐嘉陵²,黄渊²,宋文艳¹,杨顺华²,郑忠华²

西北工业大学动力与能源学院，陕西西安 710072,中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室，四川绵阳 621000,中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室，四川绵阳 621000,西北工业大学动力与能源学院，陕西西安 710072,中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室，四川绵阳 621000,中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室，四川绵阳 621000

作者简介:熊模友，男，博士生，研究领域为航空发动机燃烧室数值计算。

Abstract

Abstract: In order to describe the flame mechanism in partially premixed combustion and capture the unsteady effect of combustion phenomenon，an unsteady flamelet/progress variable approach combining large-eddy simulation was applied in simulating a turbulent partially premixed lifted flame，and then taking the calculation values comparing with experiment measuring results. It is indicated that results of unsteady flamelet progress/variable combining large-eddy simulation have captured lifted flame phenomenon in the turbulent partially premixed combustion，and the lift-off height of calculation is about 35，lift-off height by experiment measurment is also 35. At the same time，analyse the unsteady combustion characteristic phenomenon of local extinction by mean of thermochemical quantities in mixture fraction space. Thermochemical quantities in different sections by calculation agree reasonably well with the experiment measuring results. It is indicated that combining large-eddy simulation with unsteady flamelet progress/variable could correctly reflect flame mechanism existing in turbulent partially premixed combustion.

Key words: Large eddy simulation；Unsteady；Progress variable；Lifted flame；Local extinction

摘要： 为了描述部分预混燃烧的火焰机制，捕捉燃烧现象中的非稳态效应，采用大涡模拟与非稳态火焰面/反应进度变量方法相结合来模拟湍流部分预混燃烧抬举火焰，并将计算结果与实验测量值进行了对比研究。结果表明基于大涡模拟的非稳态火焰面/反应进度变量方法捕捉到了湍流部分预混燃烧中的火焰抬举现象，计算得到的火焰抬举高度大致为35，和实验测量值完全一致。同时采用各热力学参数在混合分数空间的分布来研究部分预混抬燃烧中具有非稳态燃烧特性的局部熄火现象。各不同截面上的燃烧热力学参数与实验测量值吻合较好，说明采用该方法能比较真实地反映湍流部分预混燃烧的火焰机制。

关键词: 大涡模拟；非稳态；反应进度变量；抬举火焰；局部熄火

XIONG Mo-you¹,LE Jia-ling²,HUANG Yuan²,SONG Wen-yan¹,YANG Shun-hua²,ZHENG Zhong-hua². Simulation of Partially Premixed Lifted Flame Based on Unsteady Flamelet/Progress Variable Approach of LES[J]. Journal of Propulsion Technology, 2017, 38(1): 148-157.

熊模友,乐嘉陵,黄渊,宋文艳,杨顺华,郑忠华. 基于LES的非稳态火焰面/反应进度变量方法模拟部分预混抬举火焰[J]. 推进技术, 2017, 38(1): 148-157.

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Simulation of Partially Premixed Lifted Flame Based on Unsteady Flamelet/Progress Variable Approach of LES

基于LES的非稳态火焰面/反应进度变量方法模拟部分预混抬举火焰

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