凹腔支板火焰稳定器湍流燃烧的大涡模拟研究
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- 英文论文题名：Large eddy simulation of turbulent combustion with cavity-based strut flameholder
- 论文作者：王旭东 ; 金捷
- 英文论文作者：Xu-dong Wang ; Jie JIN ; School of Energy and Power Engineering ; Beihang University
- 年：2016
- 作者机构：北京航空航天大学能源与动力工程学院;
- 论文关键词：两相湍流燃烧 ; 凹腔-支板稳定器 ; 大涡模拟
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十六分会：燃烧化学
- 语种：中文
- 分类号：O643.21
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十六分会 ; 燃烧化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：300k
- 原文格式：D
- 会议级别：全国
摘要
新型的涡轮后框架支板火焰稳定器一体化设计方案~[1],相较于传统火焰稳定器有低总压损失和轻结构重量优势,是未来发展方向。本文在典型加力燃烧室进口马赫数Ma=0.2和进口温度T=1173k的条件下,采用FLUENT软件,对新型凹腔支板火焰稳定器进行冷、热态大涡模拟研究。热态采用了火焰面湍流燃烧模型和Kundu化学反应机理,计算了油气比f=0.007凹腔支板亚音速的湍流燃烧场,并将模拟结果与实验结果对比~[2],检验了模拟方法,研究了非稳态流场结构。模拟结果表明,冷态凹腔中形成稳定的驻涡,尾缘处则形成大尺度的漩涡,近支板具有强烈的二维性,体现涡的卷吸和拉伸,远场表现出强烈的三维涡的破碎。热态喷油条件下,支板前段发生自燃着火,凹腔中非稳态变化的涡的合并与分离实现了主流和凹腔之间的传热和传质,充当了稳定的点火源,支板后方回流区尺度增大,剪切层中反应剧烈,湍动能在剪切层内成对称分布,剪切层附近分布的"小涡"使得燃料预热升温并和高温燃烧产物充分混合,实现稳定燃烧。
Nonreacting and reacting flow analysisis for cavity-based strut performed in the LES method, under the import conditions Ma = 0.2 and T = 1173 k, flamelet turbulance combustion model and Kundu chemical reaction mechanism have been used, and simulate subsonic turbulent combustion field of cavity-based strut at the fuel-air ratio f = 0.007, verify the simulation method with the experimental date. Unsteady flow field structure has been investigated, the simulation results show that the nonreacting case formed a stable vortex in cavity, two-dimensional vortex entrainment and stretching dominate the near field behind the strut, three-dimensional vortices break-up in far field; In reacting case, Separation and Merge of unsteady vortices implements the heat and mass transfer between the mainstream and the cavity, the "small scroll" besides the shear layer plays an important role in mixing and preheating of fuel.
Nonreacting and reacting flow analysisis for cavity-based strut performed in the LES method, under the import conditions Ma = 0.2 and T = 1173 k, flamelet turbulance combustion model and Kundu chemical reaction mechanism have been used, and simulate subsonic turbulent combustion field of cavity-based strut at the fuel-air ratio f = 0.007, verify the simulation method with the experimental date. Unsteady flow field structure has been investigated, the simulation results show that the nonreacting case formed a stable vortex in cavity, two-dimensional vortex entrainment and stretching dominate the near field behind the strut, three-dimensional vortices break-up in far field; In reacting case, Separation and Merge of unsteady vortices implements the heat and mass transfer between the mainstream and the cavity, the "small scroll" besides the shear layer plays an important role in mixing and preheating of fuel.
引文
[1]金捷,吴迪,季鹤鸣等.带凹腔的支板火焰稳定装置及火焰稳定方法[P],CN102200292A,2011.09.28
[2]柳杨.支板稳焰一体化新型火焰稳定器流动与燃烧性能研究[D].北京,北京航空航天大学,2013
[2]柳杨.支板稳焰一体化新型火焰稳定器流动与燃烧性能研究[D].北京,北京航空航天大学,2013