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采用平面激光诱导荧光的测试方法捕捉本生灯预混湍流火焰的瞬态形态,重点分析火焰根部的脉动特性及其对火焰稳定的影响.采用挡环和多孔板式湍流发生器,分别形成边界层湍流和位势流湍流.实验结果表明,对于这两种湍流发生器,射流火焰根部的脉动幅度都随来流速度的增大逐渐增强;增大湍流发生器的特征尺寸或者降低混气当量比,都会加大火焰根部的脉动幅度.挡环尺度的影响则表明了临界尺度的存在.当挡环尺度小于临界尺度时,火焰根部的脉动不利于火焰的稳定,即随着挡环尺度的增加,火焰吹熄速度降低.而当挡环尺度大于临界尺度时,随着挡环尺度的增加,吹熄速度变大.因此湍流的产生区域对火焰吹熄速度有着重要影响.
The planar laser-induced fluorescence method was used to capture the transient morphology of the pre-mixed turbulent flame of the Bunsen burner. The pulsating characteristics of the flame root and its influence on the flame stability were analyzed emphatically. The baffle ring and porous plate turbulence generator were used to form the boundary layer Turbulence and geopotential turbulence.The experimental results show that, for both turbulence generators, the pulsation amplitude of the jet flame roots increases with the increase of the velocity of the turbulent flow; the turbulence generator’s feature size is increased or the gas mixture equivalence ratio , Will increase the root of the flame pulsation amplitude .Block ring scale shows the existence of the critical scale.When the block ring scale is smaller than the critical scale, the root of the flame pulsation is not conducive to the stability of the flame, that is, as the ring scale increases , While the flame blowout speed decreases.When the stop ring size is larger than the critical dimension, the blowout speed becomes larger as the stop ring dimension increases, so the turbulence generation area has an important influence on the flame blowout speed.