| 热诱导浮力羽流涡旋结构直接数值模拟 |
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| 引用本文： | 邹丽,邱容.热诱导浮力羽流涡旋结构直接数值模拟[J].火灾科学,2010,19(3):116-122. |
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| 作者姓名： | 邹丽 邱容 |
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| 作者单位： | 中国科学技术大学,火灾科学国家重点实验室,安徽,合肥,230026 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 涡旋结构是湍流流场重要的研究内容之一,也是影响特殊火行为的重要因素之一,如涡旋在飞火传播中起着非常重要的作用。火羽流涡旋结构的详细分析对火灾蔓延特性的研究有重要指导意义。该文对轴对称热羽流和平面热羽流进行了直接数值模拟,分别基于涡旋动力学及涡旋稳定性角度对计算结果进行详细分析。研究表明平面热羽流的涡量值明显高于轴对称热羽流,平面热羽流具有较低的脉动频率。从涡量输运方程出发,分析得出拉伸项的存在降低了轴对称热羽流的混合强度。
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| 关 键 词： | 火灾 浮力羽流 直接数值模拟 涡旋 |
| 收稿时间： | 5/5/2010 12:00:00 AM |
| 修稿时间： | 2010/5/17 0:00:00 |
Direct Numerical Simulation of the large vortical structures in heat-induced buoyant plumes |
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| ZOU Li and QIU Rong.Direct Numerical Simulation of the large vortical structures in heat-induced buoyant plumes[J].Fire Safety Science,2010,19(3):116-122. |
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| Authors: | ZOU Li and QIU Rong |
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| Institution: | ZOU Li,QIU Rong(State key laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China) |
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| Abstract: | Vortical structure is not only an important component of turbulence flow,but also an important factor in special fire behaviors.Detailed analysis of vortical structure in fire plume has an important significance in the research of the spread of fire.Direct numerical simulation is presented for axisymmetric thermal plume and planar thermal plume.The vorticity transport equation was analyzed to examine the mechanisms leading to the difference between them.Fourier spectra were also studied.Vorticity is found t... |
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| Keywords: | Fire Buoyant plume Direct numerical simulation Vortex |
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