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为在环形叶栅低速风洞实验中模拟实际涡轮级静叶后径向压力梯度 ,在某型涡轮低压级静叶的下游流场设置了挡板 ,实验研究了挡板形式及设置位置对静叶出口流场的影响。实验结果表明 ,适当选择全环钻孔挡板不同半径处的钻孔率、钻孔直径与分布 ,可调节静叶后径向静压分布 ,采用外环或内环挡板 ,并将其分别置于静叶的近、中、远下游 ,可实现静叶栅的变焓降实验。
In order to simulate the radial pressure gradient after the actual turbine stage stator blade in the low-speed annular cascade test of the annular cascade, a baffle plate was set up in the downstream flow field of the stator blade of a low-pressure turbine stage. The effects of the baffle plate form and the setting position on the static Effect of leaf outlet flow field. The experimental results show that the borehole diameter, borehole diameter and distribution at the different radius of the full-ring baffle can be properly selected, and the radial static pressure distribution can be adjusted after the vane is fixed. The outer ring or the inner ring baffle is adopted, Placed in the static leaf near, middle and far downstream, can achieve the stator blade enthalpy drop experiment.