| 相向射流模式下竖井结构对烟气运动影响研究 |
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| 引用本文： | 陈圣元,杨永斌,肖志行.相向射流模式下竖井结构对烟气运动影响研究[J].消防科学与技术,2021,40(11):1599-1603. |
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| 作者姓名： | 陈圣元 杨永斌 肖志行 |
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| 作者单位： | （1.中国人民警察大学，河北 廊坊065000； 2.重庆市消防救援总队，重庆401121） |
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| 基金项目： | 基金项目：河北省自然科学基金项目“公路隧道相向射流与竖井排烟组合模式下的火灾烟气分布特征研究”(E2021507005) |
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| 摘 要： | 通过开展相似试验，研究了较优相向射流风速和不同火源功率条件下，竖井高度与横截面积对竖井内烟气运动模式的影响。结果表明：竖井高度与横截面积增大均会促使吸穿效应的发生；竖井横截面积越大，对应的临界竖井高度越小；求得试验条件下的Ri临界值为0.56，当Ri小于0.56时，竖井内主要发生边界层分离，当Ri大于0.56时，主要发生吸穿效应。
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| 关 键 词： | 公路隧道 竖井排烟 吸穿效应 边界层分离 相向射流 |
Study on the influence of shaft structure on smoke movement under the opposite jet mode |
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| CHEN Sheng-yuan,YANG Yong-bin,XIAO Zhi-xing.Study on the influence of shaft structure on smoke movement under the opposite jet mode[J].Fire Science and Technology,2021,40(11):1599-1603. |
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| Authors: | CHEN Sheng-yuan YANG Yong-bin XIAO Zhi-xing |
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| Affiliation: | 1. China People's Police University, Hebei Langfang 065000, China; 2. Chongqing Fire and Rescue Brigade, Chong-qing 401121, China |
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| Abstract: | The influence of shaft height and cross-sectional area on smoke movement pattern in shaft is studied by carrying out similar experiments under the conditions of better opposite jet velocity and different fire power. The experimental results show that the increase of shaft height and cross-sectional area will promote the occurrence of plug-holing; The larger the cross-sectional area of the shaft, the smaller the corresponding critical shaft height; The critical value of Ri under experimental conditions is 0.56. When Ri value is less than 0.56, boundary layer separation mainly occurs in the shaft, and when Ri value is greater than 0.56, plug-holing occurs. |
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| Keywords: | highway tunnel shaft smoke exhaust plug-holing boundary layer separation opposing jet |
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