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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flame attachment effect on the distributions of flow, temperature and heat flux of inclined fire plume
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Flame attachment effect on the distributions of flow, temperature and heat flux of inclined fire plume

机译：对倾斜火羽流的流动，温度和热通量分布的火焰附着效果

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摘要

The flame attachment behaviors over an inclined surface were investigated by a gas burner, and its effects on the temperature, heat flux, and the velocity distribution were explored by the heat flux meter, infrared thermography and particle image velocimetry (PIV) systems. The results showed that a sudden increase in flame attachment length occurred when the inclination angle of the surface increased from 15 to 20°, which caused the sharp increase of the temperature, the heat flux as well as the flame spread parameter ψ. Combined with PIV, it was found that a large velocity difference appeared between the upstream and downstream of the flame when the inclination angle increased from 15 to 20°. The vortexes induced by the velocity difference moved upward periodically along the edge of the flame, increased the turbulence intensity and accelerated flame attachment greatly. By introducing the local Richardson number (Ri_x) and the dimensionless local total heat flux, it was found that the plume was dominated by the momentum near the burner while dominated by the buoyancy in the distance. The turning point of the two regimes occurred at the ratio between the flame length to the burner hydraulic diameter of 0.5 and Ri_x ≈10, and the local heat flux distribution of downstream fire was further obtained.
机译：通过气体燃烧器研究了倾斜表面上的火焰附着行为，并通过热通量计，红外热成像和粒子图像速度（PIV）系统探索了对温度，热通量和速度分布的对温度，热通量和速度分布的影响。结果表明，当表面的倾斜角度增加到15至20°时，火焰附着长度突然增加，这导致温度急剧增加，热通量以及火焰扩散参数ψ。结合PIV，发现当倾斜角度从15到20°增加时，火焰的上游和下游之间出现了大的速度差。由速度差引起的涡流沿着火焰的边缘周期性地移动，大大增加湍流强度并大大加速了火焰附着。通过引入本地理查森数（RI_X）和无量纲局部总热量通量，发现羽流由燃烧器附近的势头主导，同时由远处的浮力主导。两种制度的转折点在火焰长度与燃烧器液压直径为0.5和Ri_x≈10之间的比率，进一步获得下游火的局部热通量分布。

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