| 引用本文: | 尹凯路,霍岩,邹高万,董惠.侧开缝竖井内多池火融合燃烧特性[J].哈尔滨工业大学学报,2022,54(12):135.DOI:10.11918/202105073 |
| YIN Kailu,HUO Yan,ZOU Gaowan,DONG Hui.Combustion characteristics of multi-pool fusion flame in a vertical shaft with side slits[J].Journal of Harbin Institute of Technology,2022,54(12):135.DOI:10.11918/202105073 |
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| 摘要: |
| 为深入掌握有侧开缝的竖井内多个彼此临近池火融合燃烧特性，在2 m高试验竖井内分别对2，3和4个正庚烷池火形成的融合火焰进行了试验。通过对不同数量的多池火在各典型摆放方式时受池间距和竖井侧开缝宽度的影响分析，以及与相同多池火在没有竖井结构约束时的自由燃烧进行了试验。结果表明：有侧开缝的竖井所形成的独特引射空气来流改变了多池火之间火焰融合形态以及对燃料液面热反馈，形成的融合旋转火焰强化了液体燃料的燃烧效率并提升了融合火焰高度；竖井结构一定时，各池液面均匀接收融合火焰热量反馈的油池摆放方式更有利于形成相对强烈的融合旋转火焰，且油池数量的增加强化融合旋转火焰的生成能力；融合旋转火焰参数受油池的数量、相对位置以及竖井侧开缝宽度耦合影响，适宜的竖井侧开缝宽度以及能使各池液面均匀接收融合火焰热量反馈的摆放方式可使燃烧效率提高近3.7倍，峰值火焰高度提升30%以上。另外，基于浮力池火叠加环量的思想，推导并拟合得到了竖井内典型形式多池火融合旋转火焰燃烧速率与火焰高度理论模型。 |
| 关键词: 多池火 竖井 融合火焰 旋转火焰 燃烧速率 火焰高度 |
| DOI：10.11918/202105073 |
| 分类号:TU998.1;X932 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51976041, 51676051) |
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| Combustion characteristics of multi-pool fusion flame in a vertical shaft with side slits |
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Kailu YIN, Yan HUO, Gaowan ZOU, Hui DONG
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College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
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| Abstract: |
| To grasp the fusion combustion characteristics of multiple pool fires adjacent to each other in a shaft with side slits, we carried out tests on the fusion flames formed by two, three, and four pool fires in a 2 m-high test shaft. The influence of the spacing between the pools and the width of the side slits of the vertical shaft with typical arrangements of multiple pool fires was analyzed, and the results were compared with free combustion test results of the same multiple pool fires without the constraints of the shaft structure. Results show that the unique jet air flow formed by the shaft with side slits changed the flame fusion form between multiple pool fires and the thermal feedback to the fuel surface. The fusion rotating flame formed in the shaft strengthened the combustion efficiency and raised the flame height. With fixed structure of shaft, relative strong fusion rotating flame was formed by adopting a pool placement form that enables the fuel surface of each pool to receive the heat feedback of the fusion flame uniformly, and the generating capacity of the fusion rotating flame was strengthened by increasing the number of pools. The parameters of the fusion rotating flame were affected by the coupling of the number and relative position of the fuel pools and the width of the slits on the side of the shaft. With proper slit width on the side of the shaft and the placement method that allows the fuel surface of each pool to evenly receive the heat feedback of the fusion flame, the combustion efficiency was increased by nearly 3.7 times and the peak flame height by more than 30%. In addition, on the basis of the idea of buoyant pool flame superposition circulation, the theoretical models of the burning rate and flame height of the typical multi-pool fusion flame in the shaft were derived and fitted. |
| Key words: multi-pool fire shaft fusion flame rotating flame burning rate flame height |
