加湿回流湍流扩散燃烧流场的实验研究

实验测量了加湿、不加湿状况下钝体后丙烷/空气湍流扩散燃烧流场,分析了两种燃烧流场的异同点.实验中采用粒子图像速度场(PIV)测量技术测量了钝体后加湿、不加湿扩散燃烧流场的速度分布,利用高温热电偶测量了两种流场火焰内部的温度分布,使用气体分析仪测量了两种流场的NO分布.结果表明:加湿扩散燃烧流场与不加湿扩散燃烧流场虽然总体相似,但加湿使得燃烧流场回流区中心的位置前移、回流区长度减小、燃烧区最高温度降低,并且使得燃烧室内的NO浓度降低;加湿有利于燃烧室轴向尺寸的缩小,提高了燃烧室内温度分布的均匀度,降低了污染物的排放.

Experimental Study on Humid Air Reverse Turbulent Diffusion Combustion Field

Experiments were performed to investigate the differences between the propane/air turbulent diffusion reactive flows past bluff-body and the propane/humid air turbulent diffusion reactive flows in the same conditions.The velocity distributions of the non-humid reactive flow fields and the humid reactive flow fields are measured by PIV(Particle Image Velocimetry) technique,the temperature fields are got with high temperature thermocouples,and the NO distributions are obtained using gas detection instrument.The results show that although humid air reactive flow fields are similar to the non-humid flow fields in general,there are some differences in the humid air combustion flow field compared to the non-humid combustion flow field: the center of the reversed-flow region goes forward;the dimension of the reversed-flow region is smaller;the peak temperature is reduced,and the NO formation is also reduced.It is suggested that humid air combustion is helpful to shorten the axial length of combustor,and reduce the formation of pollution.