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

本文研究了定压条件下，燃料液滴阵列或单个燃料液滴在稀薄均质丙烷/空气混合气中传播的层流平面火焰作用下的着火过程。对正己烷和正十六烷或正十二烷、苯和正十六烷组成的二元燃料进行了试验。水乳化液组成的正十二烷，以及纯燃料，如正己烷，正辛烷，正十二烷和正十六烷。由透明管道制成的燃烧室安装有火花电极，细石英纤维悬浮燃料滴，以及一个百叶窗，允许燃烧气体从顶端逸出。利用高速摄像机对火焰传播过程中的液滴点火过程进行了观察，发现纯燃料液滴的点火延迟随初始液滴直径的增大和燃料挥发度的减小而单调增大。初始液滴直径对着火延迟期的影响随初始液滴直径的增大而减小 ...更多信息 降低燃料挥发性。随着高挥发性燃料体积浓度的增加，二元燃料液滴的着火延迟期减小。点火延迟的二元燃料表现出最小值和最大值作为初始液滴直径的函数。随着高挥发性燃料浓度的增加，滞燃期最小值和最大值处的直径减小。点火延迟或预燃燃料液滴与初始液滴直径单调一致。较高挥发性组分的体积浓度的增加导致与燃料的二元混合物相比相反的结果，因为在这种情况下较高挥发性组分是水。在液滴后面的传播火焰的一部分变得凸向未燃烧的气体，因为它通过一个液滴或高挥发性燃料，而火焰保持平坦的低挥发性燃料。随着高挥发性燃料浓度的增加，液滴后面的传播火焰的变形长度增加。少

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。