波瓣形排气引射混合器的试验研究

Experimental Investigation of Flow and Heat Transfer in Straight Labyrinth Seal

在常压、低速排气引射条件下 ,以常规环形排气引射混合器为基准 ,试验研究了波瓣出口角度 α/β、相对混合长度 L /D和波瓣穿透率 H /Ho 等结构参数对波瓣形排气引射混合器气动性能的影响。试验表明 ,波瓣形排气引射混合器的气动性能明显优于环形排气引射混合器 ;在不引起波瓣内气流分离的情况下 ,α/β对气动性能影响不大 ;加大 L/D可以改善气动性能 ,存在气动—重量综合性能最好的最佳 L/D;较大的 H/Ho 有利于两股气流的混合 。

We built a big scale inhale labyrinth heat transfer wind tunnel.Detailed experimental investigation on the flow field in the labyrinth cavity reveals the two dimensional velocity and pressure fields as well as vortix distribution in the flow field and local heat transfer coefficient distribution on the roof of labyrinths.Therefrom the influences of different Reynolds number and T/C on the velocity and pressure distributions in the cavity of the labyrinth and on the heat transfer coefficient of the labyrinth roof seal are found out.