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利用落塔微重力实验装置和OH平面激光诱导荧光(OH—PLIF)方法,在正常重力和微重力环境下观测了一系列具有皱折锋面的甲烷 空气预混V形火焰,以研究浮力对火焰的影响。借助于高速CCD摄像装置,在实验中记录了每一个火焰在正常重力和微重力下的大量火焰锋面瞬态图像。根据皱折锋面预混火焰的特点和现有的理论,作者开发了图像处理方法用于处理实验结果,利用统计计算得出火焰结构,从而评价浮力的影响。研究表明,浮力一方面影响火焰所在流场的平均流动,另一方面也影响湍流火焰的传播,浮力对火焰的影响在一定程度上呈现出与来流湍流度和层流火焰传播速度的相关性。
A series of pre-mixed V-shaped flames of methane air with corrugated front were observed under normal gravity and microgravity using drop tower microgravity experiment and OH-plane laser induced fluorescence (OH-PLIF) method to study the effect of buoyancy on flame Impact. With the aid of a high-speed CCD camera, a large number of frontal images of the flame front under normal gravity and microgravity were recorded for each flame experiment. According to the characteristics of wrinkled frontal premixed flame and the existing theory, the author developed an image processing method for processing the experimental results, and calculated the flame structure by means of statistics to evaluate the effect of buoyancy. The results show that the buoyancy affects on the one hand the average flow of the flame field and on the other hand affects the propagation of the turbulent flame. The influence of the buoyancy on the flame shows a certain degree of correlation with the turbulence and the propagation velocity of the laminar flame .