三级旋流头部装置末级文氏管喉道面积对出口流场的影响试验研究

Experimental Investigation on Effect of Terminal Venturi Tube Throat Area on Outlet Flow Field in Triple Swirl Head Device

文氏管对涡流器具有重要的引流作用。通过改变第Ⅲ级文氏管的喉道面积大小,探究了其对三级涡流器出口流场的影响。应用粒子图像测速仪(PIV)对三头部试验件的涡流器出口流场进行分析,发现中间涡流器的两个漩涡中心的径向距离随着第Ⅲ级文氏管喉道面积的增加呈现先减小后增大的趋势。相邻三级涡流器出口流场会叠加,致使中间涡流器的回流区被压缩,回流区面积随着第Ⅲ级文氏管喉道面积的增加呈现先减小后增大的趋势,方案3的三级涡流器出口流场的速度梯度大,可实现燃烧室油气高效掺混,更有助于燃烧室点火、联焰和燃烧。

Venturi has an important drainage effect on the swirler.By changing the throat area of third-stage venturi,its influence on the outlet flow field of three-stage swirler is researched.Particle Image Velocimetry(PIV)is used to analyze the outlet flow field of the swirler of the three head test piece.It is found that the radial distance between the two vortex centers of the middle swirler first decreases and then increases with the increase of the throat area of the third-stage venturi.The flow field at the outlet of the adjacent three-stage swirler will be superimposed,resulting in the compression of the reflux area of the intermediate swirler.The area of the reflux area first decreases and then increases with the increase of the throat area of the third-stage venturi.The velocity gradient of the outlet flow field of the three-stage swirler in scheme 3 becomes larger,which can realize the efficient mixing of oil and gas in the combustion chamber,and is more conducive to the ignition,flame combination and combustion of the combustion chamber.