几种钝体冷态空气动力场的分析

Analysis on Cold Jet of Several Bluff Bodies

测量了几种不同钝体后的冷态速度场，分析了燃烧器中钝体锥角、高宽比以及钝体壁面粗糙度对回流区、回流率、射流速度衰减的影响。提出了设计“弯管＋钝体”结构形式的燃烧器中钝体的最佳锥角范围，并试图在钝体表面垂直来流方向加横条。

The cold jet of several bluff bodies was tested. The influences of the bluff body anagle and hight width ratio and the roughness of the bluff body's surface on the recirculation zone, ratio and the velocity attenuate were analyzed. The optimal angle was also put forward of designing the burner which has a structure of “syphon+bluff body”, and it was suggested that it be better add cross band on the surface of the bluff body upright the direction of flow.