A study on ceiling jet flow behaviour

天花板射流行为研究

• 批准号: 23310108
• 负责人: OKA YASUSHI
• 金额: $ 12.48万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23310108/
• 关键词: 火災感知; 天井流; 傾斜天井; 煙層; 垂れ壁; トンネル

A series of experiments that focused on the flow behavior of ceiling jet, which flows under an unconfined ceiling, were conducted. Based on the experimental results, empirical formula for temperature rise and velocity decreasing, thickness and distribution against radial distance were developed considering the effect of inclination angle.To examine the effect of fire source shape to the ceiling jet flow, the rectangular fire source was employed. By comparing the temperature rise decreasing and temperature distribution with them obtained by a square fire source, typical difference for temperature rise decreasing against radial distance was confirmed. Detailed measurements of the temperature rise and velocity in a horizontal tunnel with a rectangular cross section were conducted to examine the effect of side wall on the ceiling jet. Empirical relationship to estimate the decrease in the ceiling jet temperature rise and velocity along the horizontal axis of the tunnel was developed.

对在无约束顶板下流动的顶板射流的流动特性进行了一系列实验研究。在实验结果的基础上，考虑倾角的影响，建立了沿径向距离的温升降速、厚度及分布的经验公式。为了研究火源形状对顶棚射流的影响，采用矩形火源。通过与方形火源的温升衰减和温度分布的比较，确定了温升衰减随径向距离的典型差异。通过对矩形横截面水平隧道的温升和速度的详细测量，考察了侧壁对顶棚射流的影响。建立了沿隧道水平方向计算顶棚射流温升和速度下降的经验关系式。

项目成果

Temperature and Velocity Distributions of Ceiling Jet along an Inclined Ceiling -Part 2 : approximation based on cubic function and coordinate transformation

沿倾斜天花板的天花板射流的温度和速度分布 - 第 2 部分：基于三次函数和坐标变换的近似

• 发表时间: 2014
• 期刊: Fire Safety Journal
• 影响因子: 3.1
• 作者: Oka;Y. and Imazeki;O.
• 通讯作者: O.

トンネル火災時の熱気流の温度性状に関する実験的研究

隧道火灾时热气流温度特性实验研究

• 发表时间: 2013
• 作者: 本田千秋;小野寺伸也;立花和宏;仁科辰夫;Aya Tanaka，Hiroshi Nakashima，Yoshiaki Kashimura，Koji Sumitomo;山崎和俊;時永祥三 池田欽一;野澤孝甫，岡 泰資，今関 修，岡 秀行
• 通讯作者: 野澤孝甫，岡 泰資，今関 修，岡 秀行

Temperature and Velocity Distributions of Ceiling Jet along an Inclined Ceiling -Part 1 : approximation with exponential function

沿倾斜天花板的天花板射流的温度和速度分布 - 第 1 部分：指数函数近似

• 发表时间: 2014
• 期刊: Fire Safety Journal
• 影响因子: 3.1
• 作者: Oka;Y. and Imazeki;O.
• 通讯作者: O.

トンネル火災時の熱気流の温度性状に関する実験的研究, pp.167-170

隧道火灾时热气流温度特性实验研究，167-170页

• 发表时间: 2013
• 作者: 小野寺伸也;菊池秀人;本田千秋;立花和宏;仁科辰夫;章 国強;野澤孝甫,岡泰資,今関修,岡秀行
• 通讯作者: 野澤孝甫,岡泰資,今関修,岡秀行

Experimental study on temperature property along a tunnel axis with flat ceiling in natural ventilation

自然通风平顶隧道沿轴线温度特性试验研究

• 发表时间: 2014
• 期刊: Fire Safety and Science, Proceedings of the 11th International Symposium, International Association for Fire Safety Science
• 作者: Oka;Y.;Oka;H.;and Imazeki;O.
• 通讯作者: O.