Instability of Premixed Flame and its Turbulent Combustion Properties under High Pressure

高压下预混火焰的不稳定性及其湍流燃烧特性

• 批准号: 14550188
• 负责人: KITAGAWA Toshiaki
• 金额: $ 2.37万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550188/
• 关键词: Premixed Combustion; Laminar Burning Velocity; Flame Stretch; Markstein Length; Pressure Instability; 不安定性; 火炎伸張

In this study, the effects of pressure on the premixed flame propagation was investigated. In the last year, we had shown that the effects of flame stretch on the laminar burning velocity could be evaluated well by the Markstein Length and it varied according to the pressure.In this year, our study found that the flame instability was notable when the Markstein Length was small. When the Markstein Length of the mixture was small, some cracks were formed on the surface of the spherical laminar flame. Lean methane and rich propane mixtures showed this properties.For all the mixtures examined in this study, Markstein Length became small according to the pressure. Cracks were formed in the early stage of the propagation with increasing the pressure. For some mixture with small Markstein Length, flame was covered with cells. The timing of this transition to cellular flame from laminar flame became earlier as the Markstein Length was smaller. The size of cell also became small with increasing the pressure and decreasing the Markstein Length.

在这项研究中，压力对预混火焰传播的影响进行了研究。去年的研究表明，Markstein长度可以很好地反映火焰拉伸对层流燃烧速度的影响，并且Markstein长度随压力的变化而变化，今年的研究发现，Markstein长度较小时，火焰不稳定性显著。当混合物的马克斯坦长度较小时，球形层流火焰表面会产生裂纹。对于贫甲烷和富丙烷混合物，Markstein长度随压力的增加而减小。随着压力的增加，裂纹在扩展的早期阶段形成。对于Markstein长度较小的混合物，火焰被细胞覆盖。随着Markstein长度的减小，从层流火焰向胞状火焰转变的时间变得更早。随着压力的增加和Markstein长度的减小，胞体尺寸也变小.

项目成果

D.Bradley, T.Kitagawa, C.G.W.Sheppard, et al.: "Turbulent Burning Velocity, Burned Gas Distribution, and Associated Flame Surface Definition"Combustion and Flame. Vol.133. 415-430 (2003)

D.Bradley、T.Kitakawa、C.G.W.Sheppard 等人：“湍流燃烧速度、燃烧气体分布和相关的火焰表面定义”燃烧和火焰。

D.Bradley, T.Kitagawa, C.G.W.Sheppard 他4名: "Turbulent Burning Velocity, Burned Gas Distribution, and Associated Flame Surface Definition"Combustion and Flame. 133. 415-430 (2003)

D.Bradley、T.Kitakawa、C.G.W.Sheppard 和其他 4 人：“湍流燃烧速度、燃烧气体分布和相关火焰表面定义”燃烧与火焰 133. 415-430 (2003)

D.Bradley, T.Kitagawa, C.G.W.Sheppard, 他4名: "Turbulent Burning Velocity, Burned Gas Distribution, and Associated Flame Surface Definition"Combustion and Flame. 133. 415-430 (2003)

D.Bradley、T.Kitakawa、C.G.W.Sheppard 和其他 4 人：“湍流燃烧速度、燃烧气体分布和相关火焰表面定义”燃烧和火焰。 133. 415-430 (2003)

北川敏明, 他4名: "層流燃焼速度およびMarkstein長さに及ぼす圧力の影響"第17回内燃機関シンポジウム講演論文集. 309-314 (2002)

Toshiaki Kitakawa 等 4 人：“压力对层流燃烧速度和 Markstein 长度的影响”第 17 届内燃机研讨会论文集 309-314 (2002)。

北川敏明, 他4名: "球状伝播火炎における層流燃焼速度およびMarkstein長さに及ぼす圧力の影響"第40回燃焼シンポジウム講演論文集. 267-268 (2002)

Toshiaki Kitakawa 和其他 4 人：“球形传播火焰中压力对层流燃烧速度和马克斯坦长度的影响”第 40 届燃烧研讨会论文集 267-268 (2002)。