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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Propagation of tribrachial flames with ozone in a laminar non-premixed jet
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Propagation of tribrachial flames with ozone in a laminar non-premixed jet

机译：三架火焰与臭氧在层状非预混喷射中的繁殖

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摘要

Effects of ozone on the propagation characteristics of the tribrachial flame in a laminar co-flow jet are experimentally investigated. Ozone is generated by a coaxial plasma reactor which can produce a maximum O-3 concentration of 2850 ppm with a power consumption of 76.5 W. A high-speed camera is employed to record the stationary and propagating flames both with and without ozone, by which the flame displacement and propagation speeds can be determined. It is shown that the flame stability characteristics are altered with the addition of O-3, in which a flame with decreased lift-off height and enhanced lift-off, reattachment and blowout velocities is observed. The enhanced flame stability with O-3 addition is due to an increase in flame displacement and propagation speeds. A scaling argument shows that the enhanced flame propagation speed is strongly related to the O-3 kinetic enhancement on laminar flame speed. Due to the distinct flame structure, the accompanied hydrodynamic enhancement by O-3 addition facilitates the tribrachial flame propagation, implying an over-prediction of the O-3 kinetic enhancement. The hydrodynamic enhancement with O-3 presence originates from a stronger flow redirection, due to the higher sensitivity of off-stoichiometric flames to O-3 enhancement on laminar flame speed, and a more slanted flame front, due to the increased velocity gradient.
机译：实验研究了臭氧对层流速率射流中的平坦火焰传播特性的影响。臭氧由同轴等离子体反应器产生，该血浆反应器可以产生2850ppm的最大O-3浓度，功耗为76.5W。采用高速相机用于记录静止和传播的火焰，无论是否有臭氧可以确定火焰位移和传播速度。结果表明，随着o-3的加入来改变火焰稳定性特性，其中观察到升空高度降低和增强的剥离，重新附接和井喷速度的火焰。通过O-3添加的增强的火焰稳定性是由于火焰位移和传播速度的增加。缩放论证表明，增强的火焰传播速度与层流火焰速度的O-3动力学增强强烈相关。由于对火焰结构不同，O-3添加的伴随的流体动力学增强促进了TRIBRACHIAL火焰传播，这意味着O-3动力学增强的过度预测。由于速度梯度增加，由于偏移量的速度升高，并且由于增加的速度梯度，因此具有较强的流动重定向源自更强的流量重定向。

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