多孔式喷嘴加湿旋流扩散燃烧流场的实验研究

利用激光粒子图像速度场测量技术对环型多孔式喷嘴的加湿与不加湿旋流扩散燃烧流场进行了实验研究,分析了湿度对旋流扩散燃烧流场的影响.结果表明,随着燃烧流场湿度增大,火焰明显变暗,火焰宽度和高度增大,回流区漩涡与燃烧器出口和喷嘴轴线间的距离减小,轴线上最大回流速度降低,轴线最大回流速度点与喷嘴的距离增加,逆流区宽度和喷嘴旋转射流扩展角减小,流场轴向出口的不均匀系数增大.

Experimental Investigation on Humid Air Diffustion Combustion in a Multihole Nozzle Swirl Burner

Experiments were performed to investigate the flow structures of humid air combustion flame in a multihole nozzle swirl burner. The experiments show that with steam addition, the flame becomes dark, and the flame dimensions grow; the distances between vortexes of recirculation zone and nozzle reduce; the peaks of radial mean velocity, radial rms velocity and Reynolds shear stress decrease; the maximum mean turbulent kinetic energy decreases, and the biggest reversing velocity on nozzle centerline reduces; the width of recirculation zone and the distance between centerline biggest reversing velocity and nozzle is lower; the expansion angle of swirling jet reduces；the axial non uniform coefficient of outlet increases.