Flame Behavior and Thermal Propertoifes a Jet Flame with a HighInitial Discharging Velocity

高初始放电速度射流火焰的火焰行为和热特性

• 批准号: 22310105
• 负责人: SUGAWA Osami
• 金额: $ 11.4万
• 依托单位: Tokyo University of Science, Suwa
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22310105/
• 关键词: 火災; バックドラフト; 噴出時火炎; 乱流拡散火炎; 火炎性状; 物理モデル; 噴出角度; 液体燃料; 噴出時火災; 乱流拡散火災; 火災性状

In order to investigate flame behavior and thermal properties of the jet flame with comparatively high initial velocity, a series of experiments was carried out. The jet flame was made vertically in the present experiment, and to investigate the influence of the flame formation direction on the flame behavior and thermal properties, present experimental datum were compared with the datum of the flame length and temperature of hydrogen jet flame in reference. The fuel releasing time and the mass flow rate of fuel were varied as experimental conditions. At least one second is necessary to reach a quasi steady state for the height of the jet flame with comparatively high initial velocity, and at least three seconds is necessary for the temperature around the jet flame. The range that the flame height (flame formation direction: vertical) and/or flame length (flame formation direction: horizontal) depend on the Q*2/5 and the range that the flame height and/or flame length don't deped the heat rlease rate can be divided by the range of RM which implies the ratio of the gas release momentum to the momentum generated by a purely buoyant diffusion flame, regardless of the range of Q*. The temperature along the central axis of the jet flame maintains similarity with the change of the heat release rate. The starting point of the temperature decrease was moved further position from the fire source which was the outlet of the fuel releasing nozzle. But once the temperature decrease starts, the temperature decreased more rapid than McCaffrey's relation. The empirical formulae on the temperature along the central axis of the jet flame were developed which can predict regardless of the formation direction of the jet flame.

为了研究高初速射流火焰的燃烧特性和热物性，进行了一系列的实验研究。实验采用垂直射流火焰，通过与文献中氢气射流火焰长度和温度数据的对比，研究了火焰形成方向对火焰行为和热物性的影响。燃料释放时间和燃料的质量流量随实验条件变化。对于具有相对高的初始速度的射流火焰的高度，至少需要一秒来达到准稳定状态，并且对于射流火焰周围的温度，至少需要三秒。火焰高度的范围（火焰形成方向：垂直）和/或火焰长度（火焰形成方向：水平）取决于Q*2/5，并且火焰高度和/或火焰长度不取决于放热速率的范围可以除以RM的范围，RM的范围意味着气体释放动量与由纯浮力扩散火焰产生的动量的比率，而与Q* 的范围无关。射流火焰中心轴线上的温度沿着方向与热释放速率的变化基本一致。温度下降的起始点移动到离火源更远的位置，即燃料释放喷嘴的出口。但一旦温度开始下降，温度下降的速度比麦卡弗里的关系。建立了射流火焰中心轴线上沿着温度的经验公式，该公式可以预测射流火焰的形成方向。

项目成果

比較的大きな初速度を持つ噴出時火炎の性状その1実験結果及び考察

较大初速喷发火焰的特性第1部分实验结果与讨论

• 发表时间: 2010
• 作者: Naito;H.;Uendo;T.;Saso;Y.;Kotani;Y. and Yoshida;A.;今村友彦,須川修身,上矢恭子,鈴木俊光,山本豊
• 通讯作者: 今村友彦,須川修身,上矢恭子,鈴木俊光,山本豊

高速噴出時火炎の形状に及ぼす噴出角度の影響

高速喷射时喷射角对火焰形状的影响

• 发表时间: 2011
• 作者: Rongshuai Li;Akira Mita and Jin Zhou;今村友彦,塚原瑞貴,石川亮,須川修身,上矢恭子
• 通讯作者: 今村友彦,塚原瑞貴,石川亮,須川修身,上矢恭子

高速噴出時火炎の形状に及ぼす噴射角度の影響

喷射角度对高速喷射时火焰形状的影响

• 发表时间: 2011
• 作者: 今村友彦;塚原瑞貴;石川亮;須川修身;上矢恭子
• 通讯作者: 上矢恭子

Flame Height of a Turbulent Diffusion Jet Flame with a Comparatively High Initial Discharging Velocity

具有较高初始排放速度的湍流扩散射流火焰的火焰高度

• 发表时间: 2011
• 期刊: Journal of Fire Science and Technology
• 作者: Tomohiko Imamura;Osami Sugawa;Kyoko Kamiya;Yasushi Oka;Tosimitsu Suzuki and Yutaka Yamamoto
• 通讯作者: Tosimitsu Suzuki and Yutaka Yamamoto

比較的大きな初速度を持つ噴出時火炎の性状その1実験概要

较大初速喷发火焰的特性第1部分实验概述

• 发表时间: 2010
• 作者: S.F.A.Rahman;A.M.Hashim;S.Kasai;須川修身,今村友彦,上矢恭子,鈴木俊光,山本豊
• 通讯作者: 須川修身,今村友彦,上矢恭子,鈴木俊光,山本豊