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Flame whirling characteristics of fire in a room with vent
Fire and Materials ( IF 1.9 ) Pub Date : 2021-08-23 , DOI: 10.1002/fam.3023
Wei Peng Fan 1 , Ya Wei Wang 1 , Ye Gao 1 , Wan Ki Chow 2 , Joseph Hung Kit Lai 2 , Cheuk Lun Chow 3 , Chi Honn Cheng 3
Affiliation  

Velocity distribution and motion of a whirling flame in a room fire with vent were studied analytically in this article. Using Rankine vortex model, whirling flame models with and without decay of the rotation velocity were established. The whirling flame model and the cross-wind velocity boundary conditions were used to study the velocity distribution of the rotating flame under the action of side wind. When there is a linear velocity gradient in the lateral wind, the whirling flame still revolves around the same axis at different heights in the model without attenuation of rotation velocity, but the axis becomes tilted. In the rotation velocity attenuation model, the axis of the whirling flame changes from a straight line to a curve, and the change of the shape of the whirling flame is related to the flame height, the rotation angular velocity, and the maximum wind velocity. Under the assumption of Rankine vortex model with the same rotation angular velocity, the uniform lateral wind and lateral wind with linear velocity gradient can only affect the position and shape of the whirling flame axis but not change the rotation angular velocity.

中文翻译:

有通风口的房间内火的火焰旋转特性

本文对带通风口的室内火灾中旋转火焰的速度分布和运动进行了解析研究。利用朗肯涡旋模型,建立了旋转速度衰减和不衰减的旋转火焰模型。采用回旋火焰模型和侧风速度边界条件研究了侧风作用下旋转火焰的速度分布。当侧风存在线速度梯度时,旋转火焰在模型中不同高度仍围绕同一轴旋转,旋转速度没有衰减,但轴变得倾斜。在旋转速度衰减模型中,旋转火焰的轴线由直线变为曲线,旋转火焰形状的变化与火焰高度、旋转角速度、和最大风速。在具有相同旋转角速度的兰金涡模型假设下,均匀横向风和具有线速度梯度的横向风只会影响旋转火焰轴的位置和形状,而不会改变旋转角速度。
更新日期:2021-08-23
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