The experimental results show that the distribution of the radial static pressure behind the model cascade can be controlled by changing the diameter , number and distribution of the holes at different radius of the full circled backboard with the holes properly , and the experiments variable enthalpy drop in the model cascade can be realized by using out - circled backboard or in - circled backboard which are set on the different distances from the trailing edge of the model cascade 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。