Combustion Analysis of Unsteady Diffusion Flame of Spray by Means of Measurement of Spatial Distribution of Chemical Species and Soot

化学物质和烟尘空间分布测量分析喷雾非定常扩散火焰的燃烧

• 批准号: 08455109
• 负责人: FUJIMOTO Hajime
• 金额: $ 4.16万
• 依托单位: Doshisya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455109/
• 关键词: unsteady diffustion flame; OH radical natural emission; soot; flame temperature; laser induced scattering; laser induced incandescence; two-color method; simulation; 非定常拡散噴霧火炎; 火炎温度; 画像二色法; 相対すす濃度; OHラジカル; 燃料蒸気濃度分布; 拡散噴霧火炎; 窒素酸化物; 流動解析; レ

The outline of research results conducted during the term of this project is as follows :1)Modeling of unsteady and evaporating spray impinging on a flat and hot wallThe evaporating process of an unsteady spray impinging on a flat and hot wall is simulated precisely by use of new three models, that is, droplet breakup model, droplet dispersion model and heat transfer model, as the significant step of the simulation of its flame. They can express all the evaporation phenomena of non-boiling, nucleate, transition and filmboilings. The objective spray is simulated by KIVA-II original code applying these models. The simulated results of distributions of fuel vapor concentration and droplet parcels agree very well the experimental results detected by the laser induced method.2)Combustion analysis of unsteady diffusion flame of spray in direct injection diesel engine with optical accessThe simultaneous application of methods of laser induced scattering and laser induced incandescence, that o … More f two-color method and the measurement of the natural emission of OH radicalas the representative of chemical species were carried out in the objective flame generating in a direct injection diesel engine with the optical access to detect distributions of soot, OH radical and flame temperature. The following main conclusions are drawn :(1)The mean relative soot diameter increases as the passage of the time during the period of diffusion burning.(2) The mean relative soot number density has the peak when combustion turns from the pre-mixed burning to the diffusion burning.(3)In the central region of the combustion chamber a great deal of soots with small diameter produce by the pre-mixed burning.(4)The first appearance of the natural emission of OHI radical is later than that of soot.3)Combustion analysis of unsteady diffusion flame of spray in in-direct injection diesel engine with optical accessThe distribution of the natural emission of OH radical and those of soot and flame temperature by means of the two-color method were measured in the obj ective flame. The following main conclusions are obtained :(1)The counter clock wise flow appears in the swirl chamber during the initial combustion stage.(2)The flame temperature is low near the passage way between both swirl and main chambers during the middle combustion stage.(3)The natural emission of OH radical breaks out near the passage way and the flame tip region. Less

1)非定常喷雾撞击平板热壁的数值模拟采用新的三个模型，即液滴破碎模型、液滴扩散模型和换热模型，对非定常喷雾撞击平板热壁的蒸发过程进行了精确的数值模拟，这是火焰模拟的重要步骤。它们可以表达非沸腾、成核、过渡和薄膜沸腾的所有蒸发现象。应用这些模型，用KIVA-II原始程序对目标喷雾进行了模拟。2)光学直喷式柴油机喷雾非定常扩散火焰的燃烧分析激光诱导散射法和激光诱导白炽法同时应用于直喷式柴油机的…在直喷式柴油机的目标火焰产生过程中，利用光学通道检测碳烟、OH自由基和火焰温度的分布，并进行了双色法和对化学物种中具有代表性的OH自由基的自然释放量的测量。主要结论如下：(1)在扩散燃烧过程中，碳烟的平均相对直径随着时间的推移而增大。(2)当燃烧从预混燃烧转向扩散燃烧时，平均相对碳烟密度达到峰值。(3)在燃烧室中心区，预混燃烧产生了大量的小直径碳烟。(4)OHI自由基自然排放的出现晚于碳烟的自然排放。3)喷雾直喷柴油机非稳态扩散火焰的燃烧分析。用双色法测量了目标火焰中OH自由基的自然发射、烟尘和火焰温度的分布。得到了以下主要结论：(1)在燃烧初期，旋流室内出现逆时针方向流动；(2)燃烧中期，旋流与主燃烧室之间通道附近火焰温度较低；(3)在通道和火焰尖端附近发生了OH自由基的自然释放。较少

项目成果

Senda, J., Kanda, T., Kobayasi, M., Fujimoto, H.: "Quantitative Analysis of Fuel Vapor Concentration in Diesel Spray by Means of Exciplex Fluorescence Method" Trans.SAE. 106. 285-295 (1997)

Senda, J.、Kanda, T.、Kobayasi, M.、Fujimoto, H.：“通过激基复合物荧光法定量分析柴油喷雾中的燃油蒸气浓度”Trans.SAE。

千田, 横山, 池田, 伊福, 藤本: "液化CO_2溶解燃料によるディーゼル機関のすす, NO_Xの同時低減" 自動車技術会論文集. 30. 15-20 (1999)

Senda、Yokoyama、Ikeda、Ifuku、Fujimoto：“使用液化 CO_2 溶解燃料同时减少柴油发动机中的烟灰和 NO_X”，日本汽车工程师学会汇刊 30. 15-20 (1999)。

Dan, T., Takagishi, S., Senda, J., Fujimoto, H.: "Organized Structure And Motion in Diesel Spray" SAE Technical Paper. 970641. 265-278 (1997)

Dan, T.、Takagishi, S.、Senda, J.、Fujimoto, H.：“柴油喷雾中的组织结构和运动”SAE 技术论文。

Fujimoto, H., Kusano, S., Senda, J.: "Distribution of Vapor Concentration in Diesel Spray Impinging on a Flat Wall by Means of Exciplex Fluorescence Method-In Case of High Injection Pressure-" SAE Trans.106-972916. 133-144 (1997)

Fujimoto, H.、Kusano, S.、Senda, J.：“在高喷射压力的情况下，通过激基复合物荧光法测定撞击平壁的柴油喷雾中的蒸气浓度”SAE Trans.106-972916。

千田, 横山, 池田, 伊福, 藤本: "液化CO_2溶解燃料によるディーゼル機関のすす,NO_xの同時低減" 自動車技術会論文集. 30・1. 15-20 (1999)

Senda、Yokoyama、Ikeda、Ifuku、Fujimoto：“使用液化 CO_2 溶解燃料同时减少柴油发动机中的烟灰和 NO_x”，日本汽车工程师学会会刊 30・1（1999 年）。