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Effects of the Coherent Vortex on Combustion in Jet Diffusion Flames

相干涡流对射流扩散火焰燃烧的影响

基本信息

批准号：
05650220
负责人：
NODA Susumu
金额：
$ 1.41万
依托单位：
Toyohashi University of Technology (1994)Maizuru National College of Technology (1993)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650220/
关键词：
jet diffusion flame combustion mixing layr vortex numerical analysis visualization image analysis

项目摘要

1. The combination of the schlieren and the Mach-Zehnder method was applied to make clear an effect of the coherent vortex on combustion in jet diffusion flames. Application of this method to jet diffusion flames have shown that an effect of the center vortices is restricted just near the flame base and an effect of the boundary vortices extends over a wider region through the mixing with the surrounding air. Moreover, whereas the correlation between the temperature and the OH emission intensity is small at the position where the center vortices exist, the center vortices on the schlieren photographs are identified as the boundary between hot and cool gases which is occupied mainly by the fuel. However, the center vortices work for the stabilization of both the attached and lifted flames.2. The flame structure on the early stage of flame formation has been discussed in two-dimensional reacting mixing layr by a numerical analysis. The effects of velocity difference and of dilution fuel on its structure has been specifically. Flames are formed in the low-speed oxidizer side of the mixing layr, which is formed by a high-speed fuel flow and a low-speed oxidizer flow behind the split plate. The heat release reaction takes place mainly at the leading edge. The increase in velocity difference enlarges the scale of the vortices, to act as a quenching of flame, and to blow flame off.

1.将纹影技术与马赫-曾德尔方法相结合，研究了拟序涡对射流扩散火焰燃烧的影响。将该方法应用于射流扩散火焰表明，中心涡的作用仅限于火焰底部附近，而边界涡的作用通过与周围空气的混合而扩展到更宽的区域。此外，而温度和OH排放强度之间的相关性是小的中心涡存在的位置，纹影照片上的中心涡被确定为热，冷气体之间的边界，主要由燃料占据。而中心涡对附着火焰和升力火焰的稳定性都起作用.通过数值分析，讨论了二维反应混合层中火焰形成初期的结构。详细分析了速度差和稀释油对结构的影响.火焰形成在混合层的低速氧化剂侧，其由高速燃料流和低速氧化剂流在分离板后面形成。放热反应主要发生在前缘。速度差的增加扩大了旋涡的规模，起到熄灭火焰和吹熄火焰的作用。