Group Combustion and Detailed Flame Structure of Liquid Fuel Spray Under the Infulence of Eddies

涡流影响下液体燃料喷雾的团燃烧和详细火焰结构

• 批准号: 04452148
• 负责人: MIZUTANI Yukio
• 金额: $ 4.61万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452148/
• 关键词: Liquid Fuel; Combustion Phenomena(3); Laser, Group Combustion; Light Emission; Mie-Scattering; Spectral Analysis; Wake; PDA, LDV; 統計解析; 周波数解析; フェーズドップラー流速計(PDA); ファイバーLDV(FLDV)

(1) A spray flame has inevitably a complicated structure due to grouping behavior of droplets and preferential flame propagation through the mixture of air and fuel vapor from droplets. In order to observe the detailed structure of spray flames, the light emissions in OH and CH bands, and the laser light scattered by droplets were monitored simultaneously and analyzed spectrally in the flame of a premixed spray stabilized by an annular hydrogen pilot flame. The diameter and velocity of droplets in the flame were also monitored using a phase Doppler anemometer (PDA). It was confirmed experimentally that the combustion reaction occurred first in the intercluster regions by the preferential flame propagation through the fuel vapor from droplets, and then, as the droplet number density of clusters decreased along the stream line, the combustion zone gradually moved into the clusters, and eventually dense small subclusters or single droplets burned in the diffusion combustion mode.(2) A circular rod was inserted in a spray flame stabilized by an annular hydrogen diffusion pilot flame to investigate the detailed structure of the spray flame under the influence of wake flow behind the rod. The light emissions in OH and CH bands, and the laser light scattered by droplets were monitored simultaneously and analyzed spectrally in the flame with and without the rod. The droplet velocity was also monitored using a laser Doppler velocimeter (LDV). It was confirmed experimentally that the inserted rod promoted the reduction of the length scale of droplet clusters and the flame propagation into the clusters with solid-body light emission. This result suggests that the combustion behavior of the clusters was influenced by the turbulent mixing and slip velocity between gas and droplets due to the wake flow behind the rod.

(1)由于液滴的成组行为和液滴在空气和燃油蒸汽混合物中的优先火焰传播，喷雾火焰不可避免地具有复杂的结构。为了观察喷雾火焰的详细结构，在OH和CH波段的光发射，和液滴散射的激光被同时监测和光谱分析的火焰中的预混喷雾由环形氢先导火焰稳定。火焰中液滴的直径和速度也使用相位多普勒风速计（PDA）进行了监测。实验证实，燃烧反应首先发生在团簇间区域，火焰优先通过液滴的燃料蒸汽传播，然后，随着团簇的液滴数密度沿流线沿着减小，燃烧区逐渐向团簇内移动，最终形成致密的小团簇或单个液滴以扩散燃烧方式燃烧。(2)在环形氢扩散引燃火焰稳定的喷雾火焰中插入一根圆棒，研究了圆棒后尾流影响下喷雾火焰的详细结构。在OH和CH波段的光发射，和液滴散射的激光被同时监测和光谱分析在火焰中有和没有杆。还使用激光多普勒测速仪（LDV）监测液滴速度。实验证实，插入棒促进了液滴团的长度尺度的减小和火焰传播到团簇与固体光发射。这一结果表明，团簇的燃烧行为的影响，湍流混合和滑移速度之间的气体和液滴，由于在杆后的尾流。

项目成果

F.AKAMATSU, K.NAKABE, Y.MIZUTANI, and M.KATSUKI: "Group Combustion Behavior of Droplets in a Premixed Spray Flame" ICLASS94. (to be presented).

F.AKAMATSU、K.NAKABE、Y.MIZUTANI 和 M.KATSUKI：“预混合喷雾火焰中液滴的群燃烧行为”ICLASS94。

Kazuyoshi NAKABE,Yukio MIZUTANI,Fumiteru AKAMATSU,Hiroyuki FUJIOKA: "Simultaneous Visualization of Droplet Clusters,Chemiluminescence and Spectral Luminosity in Spray Flames" Atomization and Sprays. (掲載予定).

Kazuyoshi NAKABE、Yukio MIZUTANI、Fumiteru AKAMATSU、Hiroyuki FUJIOKA：“喷雾火焰中液滴簇、化学发光和光谱发光的同时可视化”雾化和喷雾（待出版）。

中部主敬,水谷幸夫,藤岡博之,赤松史光: "分光可視化画像処理による噴霧火炎の構造観察" 日本機械学会論文集,58-546B(1992),635.

Shutaka Chubu、Yukio Mizutani、Hiroyuki Fujioka、Fumimitsu Akamatsu：“使用光谱可视化图像处理观察喷雾火焰的结构”日本机械工程师学会会刊，58-546B（1992），635。

赤松史光,水谷幸夫,香月正司,中部主敬,岡康浩,井本泰造: "円柱により保炎された噴霧流の集合燃焼挙動" 日本機械学会関西支部第251回講演会講演論文集. 924-5. 102-104 (1992)

Fumimitsu Akamatsu、Yukio Mizutani、Shoji Kazuki、Takashi Chubu、Yasuhiro Oka、Taizo Imoto：“气缸火焰稳定喷雾流的集体燃烧行为”日本机械工程师学会关西分会第 251 届会议论文集。 924 -5。102-104（1992）

F.Akamatsu,K.Nakabe,Y.Mizutani and M.Katsuki: "Group Combustion Behavior of Droplets in a Premixed Spray Flame" ICLASS-94. (発表予定).

F.Akamatsu、K.Nakabe、Y.Mizutani 和 M.Katsuki：“预混合喷雾火焰中液滴的群体燃烧行为”ICLASS-94（待提交）。