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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >TRANSPORT IN TURBULENT JET DIFFUSION FLAMES WITH ANNULAR COUNTERFLOW
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TRANSPORT IN TURBULENT JET DIFFUSION FLAMES WITH ANNULAR COUNTERFLOW

机译：环形逆流湍流射流扩散火焰的传输

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摘要

The present study deals with the augmentation of the turbulent shear effect on transport in turbulent jet diffusion flames due to the presence of air-suction flow and the possibility of extending the flame blow-off limits through augmentation. The experimental apparatus employed here comprises a fuel nozzle placed at the center of a concentric annulus with an outer cylinder encompassing the nozzle. The fuel jet is allowed to eject upwards and turbulent jet diffusion flames are formed by igniting the jet, then by increasing the volume flow rate of the fuel. The annular counterflow technique was employed to augment the turbulent shear effect It is found that (1) the augmentation of turbulent shear effect exerted on the shear layer formed between the jet flames and the opposed flow of air causes an increase in temperature of the cold fad gas at the flame center and an extension of flame blowoff limits; (2) flame lift-off heights are suppressed; (3) the lift-off propensity of the diffusion flame is alleviated by such augmentation.
机译：由于空气吸入流的存在以及通过扩展扩展火焰吹扫极限的可能性，本研究处理了湍流剪切对湍流射流扩散火焰中运输的影响的增加。这里使用的实验设备包括一个燃料喷嘴，该燃料喷嘴放置在同心环的中心，外筒包围着该喷嘴。允许燃料喷射流向上喷射，并通过点燃喷射流，然后通过增加燃料的体积流量来形成湍流的喷射扩散火焰。采用环形逆流技术来增强湍流剪切效应。发现：（1）施加在射流火焰和空气的相反流动之间形成的剪切层上的湍流剪切效应的增强导致冷风的温度升高。火焰中心处的气体和火焰吹扫极限的扩展； （2）抑制了火焰的上升高度； （3）通过这种增加减轻了扩散火焰的脱离倾向。

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