侧壁有出流孔的通道流场实验研究

Aerodynamic investigation of flow fields in the channel with ejection through the holes on the wall

关键词:  错排孔+  二次流  偏转  流动分布  薄膜冷却

Key words:  Staggered holes~+  Secondary flow  Deflection  Flow distribution  Film cooling

摘要:

用五孔探针对侧壁开有出流孔的通道流场进行了详细测量,着重研究出流孔上、下游截面内的流动规律,分析了错排孔对通道流场的影响。实验发现出流孔上游各截面内的流动沿流向呈加速趋势,其下游截面的流速先急剧减缓,然后逐渐加速直至下一出流。距孔最近的上游截面内气流明显向孔偏转,由于惯性作用,孔下游各截面内的二次流仍很显著。

Abstract:

Experimental results are presented to describe the flow behavior in the channel with normal holes on the wall. Measurements were performed using 5-hole probe so that all three mean velocity components could obtained. Particular attention was paid to the upstream and downstream regions of hole No.3. The influence of the staggered holes is included in the analysis of the flow physics. Important aspects of the study include: (1) flow undergoes a strong acceleration and a subsequent rapid deceleration during passing hole. The presence of the holes reduces the mass flux of the channel. (2) in general, there are strong secondary flows in the downstream planes because of inertia. (3) second flows in the immediate vicinity of the hole deflect toward hole extremely.