上游斜坡对气膜冷却流动影响的实验研究

摘要

An experiment on flow field and effectiveness of flat‐plate film cooling with upstream ramp is made by equipping an hot‐wire anemometer in the wind tunnel .The heights of the ramps are set as 0 .5d and 1 .0d (d refers to the diameter of the film cooling hole) .Velocity and turbulence distributions are obtained in the experiment compared with a film cooling hole without upstream ramp so as to show the ramp’s influence on flow field .Results show upstream ramp contributes to higher turbulence in downstream and low er velocity in upstream .%为了获得气膜孔上游放置斜坡对气膜流场结构的影响规律，利用热膜风速仪测量系统研究了斜坡的台阶高度分别为0.5d和1.0d （d为气膜孔直径）时不同吹风比下沿孔出口中心线下游气流的速度分布和湍流度分布情况，并与常规气膜孔下游流场结构进行对比，以揭示斜坡对气膜冷却流场作用的影响机理。结果表明，带斜坡的气膜冷却结构会降低孔上游的流速并提高孔下游的湍流度。