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[1]夏一帆,杨 瑶,王高峰,等.甲烷/空气预混射流火焰的大涡模拟[J].燃烧科学与技术,2017,(04):305-312.[doi:DOI 10.11715/rskxjs.R201703014]
 Xia Yifan,Yang Yao,Wang Gaofeng,et al.Large-Eddy Simulation of Premixed Methane/Air Jet Flames[J].Journal of Combustion Science and Technology,2017,(04):305-312.[doi:DOI 10.11715/rskxjs.R201703014]
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甲烷/空气预混射流火焰的大涡模拟()
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2017年04
页码:
305-312
栏目:
出版日期:
2017-08-15

文章信息/Info

Title:
Large-Eddy Simulation of Premixed Methane/Air Jet Flames
作者:
夏一帆杨 瑶王高峰郑 耀
浙江大学航空航天学院,杭州 310027
Author(s):
Xia YifanYang YaoWang GaofengZheng Yao
School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China
关键词:
湍流燃烧射流火焰大涡模拟
Keywords:
turbulent combustionjet flamelarge-eddy simulation(LES)
分类号:
TK16
DOI:
DOI 10.11715/rskxjs.R201703014
文献标志码:
A
摘要:
在不同射流速度条件下,对甲烷/空气预混射流火焰进行了大涡模拟.甲烷/空气预混射流气体按化学当量 比混合,计算采用两步简化反应机理和WALE 亚格子湍流输运模型,3 个算例下流场特征和火焰结构计算结果与前 人实验结果一致,中心线轴向速度和温度场结果与实验数据相符.通过对不同Karlovitz 数条件下甲烷/空气预混射 流火焰结构进行分析,并计算Takeno 指数,研究了湍流涡对预混火焰的影响.研究发现:在Ka<100(Ka=37)条件 下,预混射流火焰会出现预热区的增厚,放热区保持完整,湍流火焰保持为预混燃烧;在Ka>100(Ka=112)条件 下,湍流火焰进入分布反应区模式.Takeno 指数显示,由于卷吸和小尺度涡的作用,湍流火焰出现局部的部分预混燃 烧.甲烷/空气预混射流湍流火焰的大涡模拟证实了湍流火焰分布反应区模式的特点:未燃气体与燃后气体之间不再 有明显的界面,火焰面模型不再适用;反应区增厚,放热区展宽,放热率降低;由于卷吸和小尺度涡对火焰的作用, 湍流火焰局部出现部分预混燃烧;湍流火焰温度降低,放热区附近温度场趋向均匀.
Abstract:
Large-eddy simulation(LES)of premixed CH4/air jet flames at different jet velocity was investigated. The jet flames were stoichiometrically premixed. Two-step reduced scheme and WALE model were employed in the simulation. The structure of the premixed CH4/air jet flames is studied with different Karlovitz numbers(Ka=37,112). The interaction between flames and turbulent eddies was analyzed considering the Takeno index. The results show that:if Ka< 100(Ka=37),the thickness of the preheat layer and thermal layer is distorted and thickened by turbulent eddies. Meanwhile, the reaction zone remains thin and intact;if Ka>100(Ka=112),the reaction zone of the premixed flame is broadened by small eddies. The turbulent jet flame is evidenced to be within the distributed reaction zone regime. The Takeno index indicates that partial premixed combustion occurs in some regimes. Compared with the flamelet regime,the distributed reaction zone regime has the following characteristics:the sharp interface between the fresh gas and the burnt products is eliminated. Flamelet model is not available for simulations in this regime;the reaction zone and the heat release zone are thickened,and the heat release rate is reduced;because of the entrainment and interaction with small eddies, partial premixed combustion occurs in some regions;the overall temperature of the turbulent flame is reduced and the temperature field near the heat release zone tends to be more homogenized.

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备注/Memo

备注/Memo:
收稿日期:2017-01-10. 基金项目:国家自然科学基金资助项目(91541108);NSFC-广东联合基金超级计算科学应用研究专项资助项目(U1501501);中央高校基 本科研业务费资助项目(2017FZA4032). 作者简介:夏一帆(1988— ),男,博士研究生,xiayifan@zju.edu.cn. 通讯作者:王高峰,男,博士,副教授,gfwang@zju.edu.cn.
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