Unsteady Interaction Between Laminar Propagating Flame and Array of Small Fuel Droplets

层流传播火焰与小燃料液滴阵列之间的不稳定相互作用

• 批准号: 11650233
• 负责人: KADOTA Toshikazu
• 金额: $ 1.41万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650233/
• 关键词: FUEL DROPLET; PROPAGATING FLAME; IGNITION; VOLATILITY; SINGLE DROPLET; DROPLET ARRAY; BINARY FUEL; 伝播火災

An experimental study has been made of the ignition process of fuel droplet array or single fuel droplets subjected to a laminar flat flame propagating through a lean homogeneous propane/air mixture at constant pressure. Binary fuels consisting n-hexane and n-hexadecane or n-dodecane, and benzene and n-hexadecane were tested. Water-emulsified liquids consisting n-dodecane, and pure fuels like n-hexane, n-octane, n-dodecane and n-hexadecane were used as well. A combustion chamber made of a transparent duct was installed with spark electrodes, fine quartz fibers to suspend fuel droplets, and a shutter to allow the burned gas to escape at the top end. A high-speed video camera was provided for photographic observation of each droplet ignited by the propagating flame.Ignition delay of pure-fuel droplets increased monotonically with increase of the initial droplet diameter and decrease of fuel volatility. The influence of the initial droplet diameter on ignition delay decreased with increas … More ing fuel volatility. Ignition delay of the binary-fuel droplets decreased with increase of the volume concentration of the higher-volatility fuel. Ignition delay of the binary fuels showed a minimum and a maximum as a function of the initial droplet diameter. The diameters at the minimum and the maximum of ignition delay decreased with increasing higher-volatility fuel concentration. Ignition delay or emulsified-fuel droplets monotonically with the initial droplet diameter as expected. The increase in the volume concentration of the higher-volatility component caused an inverse result in comparison with that for the binary mixtures of fuels, since the higher-volatility component was water in this case. Part of the propagating flame behind the droplet became convex towards the unburned gas as it passed a droplet or higher-volatility fuels, while the flame remained flat for the lower-volatility fuels. The deformation length of the propagating flame behind the droplet increased with increasing higher-volatility fuel concentration. Less

已经针对燃油液滴阵列的点火过程或在恒定压力下通过瘦小均匀的丙烷/空气混合物传播的固定层扁平火焰的点火过程进行了实验研究。测试了二元燃料，包括N-己烷和N-己烷或N-二烷，以及苯和N-己烷。还使用了包括N多构烷的水乳化液体以及N-己烷，N-辛烷，N-二烷和N-己烷等纯燃料。安装了由透明管制成的组合室，上面安装了火花电极，细的石英纤维，以悬挂燃油液滴以及换门，以使燃烧的气体在顶端逸出。提供了高速摄像机，以通过传播火焰点燃的每个液滴的照相摄像机。纯燃料液滴的点火延迟单调增加，随着初始液滴直径的增加并减少了燃料波动。初始液滴直径对点火延迟的影响随着增加的燃料波动而减少。随着较高挥发性燃料的体积浓度的增加，二元燃料液滴的点火延迟减少了。二进制燃料的点火延迟显示最小和最大值作为初始液滴直径的函数。随着较高的挥发性燃料浓度的增加，直径最小的直径和最大点火延迟降低。点火延迟或乳化液滴单调，初始液滴直径如预期的。与燃料的二进制混合物相比，较高挥发性成分的体积浓度的增加导致反比结果，因为在这种情况下，较高的挥发性成分是水。液滴后面的一部分传播火焰通过液滴或较高的挥发性燃料，朝向未燃烧的气体凸出，而火焰则保持平坦的燃料较低的燃料。液滴后面的传播火焰的变形长度随着更高的挥发性燃料浓度的增加而增加。较少的

项目成果

Daisuke SEGAWA: "Ignition of Binary Mixture Droplets by a Propagating Laminar Flame"Proceedings of the Combustion Institute. Vol.28. 961-968 (2000)

Daisuke SEGAWA：“传播层流火焰点燃二元混合物液滴”燃烧研究所论文集。

角田敏一: "層流伝ぱ火炎による二成分燃料液滴の着火"日本機械学会論文集(B編). 66・647. 1879-1884 (2000)

Toshikazu Tsunoda：“层流传播火焰点燃二元燃料滴”，日本机械工程师学会会刊（编辑 B）1879-1884（2000 年）。

Daisuke SEGAWA: "Ignition of Binary Mixture Droplets by a Propagating Laminar Flame"Proceedings of the Combustion Institute. 28. 961-968 (2000)

Daisuke SEGAWA：“传播层流火焰点燃二元混合物液滴”燃烧研究所论文集。

Toshikazu KADOTA: "Ignition of a Binary Fuel Droplet by a Propagating Laminar Flame"Transaction of the Japan Society of Mechanical Engineers. Vol.66(B). 1879-1884 (2000)

Toshikazu KADOTA：“传播层流火焰点燃二元燃料液滴”，日本机械工程师学会汇刊。