壁冷叶片冲击射流孔的流动特性实验研究

用实验的方法对涡轮叶片壁面冲击冷却的流动特性进行了研究，并用直头五孔探针对冲击射流孔内的流场进行了详细的测量，着重研究了不同雷诺数和不同的通道高度比（通道高度与射流孔直径之比z／d）对射流孔内流动结构和流量系数的影响。实验结果表明：通道高度的变化会明显改变孔内的流场结构和孔的流量系数；而在同一通道高度下，雷诺数的改变对孔内流场影响相对较小。在射流孔内存在着漩涡结构，这有助于深入了解气膜冷却的内在机理。

Flow Characteristics Measurement in Impingement Hole of Wall-cooling Blade

Experimental results were presented to describe the flow characteristics in impingement hole of wall-cooling blade.Measurement were performed using a straight five-hole probe.The effects of the variations of Reynolds number,height/jet hole diameter ratio(channel high with hole diameter ratio) on the flow fields and discharge coefficients were studied.Important aspects of the study include: flow characteristic and discharge coefficients of the hole are varied strongly with z/d.Reynolds number does not play the primarily role while comparing to the z/d.There is vortex occurs in the hole,while is helpful to the detailed analysis of film cooling physical mechanisms.