流量分配对涡轮叶片内通道压力分布特性影响的实验研究

为掌握某型涡轮叶片内流通道不同出流位置的流量分配比例对该通道压力系数分布的影响规律.对该通道进行合理简化并根据相似原理,采用几何放大模型,在通道进口雷诺数Re=2.7×10^4～3.4×10^4的条件下,研究出流孔一、出流孔二及出流孔三5种不同流量分配情况的通道压力系数分布,结果表明：三处出流位置流量分配的变化对第一通道压力系数的影响并不明显,而对第二和第三通道的压力系数有明显影响;减小出流孔一、出流孔三流量分配比例以及增加出流孔二的流量分配比例会使通道压力系数整体较低;增加出流孔三流量分配比例使第三通道压力系数整体较高且沿流程下降趋势缓和.

Experimental Investigation on Flow Rate Allocation Influence on Pressure Distribution Characteristic of Serpentine Channel

This paper focuses on the pressure coefficient distribution in simplified model of some realistic turbine blade internal cooling channel for obtaining the characteristic of outflow rate allocations influence on pressure coefficient distribution. This model has been amplified geometrically according to analogous theory. Experiments with five outflow rate allocations of these three outlets including outlet1, outlet2, and outlet3, have been performed based on inlet Reynold number from 27000~34000. The experimental results show that : (1). the pressure coefficient distribution in the first channel has not been influenced obviously by different outflow rate allocations, besides in the second and the third channel; (2). the pressure coefficient of this model will wholly decline when increasing outflow rate allocation of outlet2 and decreasing outflow rate allocation of outlet1 and outlet3; (3). the pressure coefficient of the third channel will be more higher than other situations and the declining trend of pressure coefficient will be more gently than others when the outflow rate allocation of outlet3 increases.