前言在凝汽式汽轮机中,经常可以看到叶片表面的水蚀现象。由于水蚀的结果,叶片表面逐渐形成凹凸不平的蜂窝状表面。水蚀区占据进汽边叶型的很大一部分,有时可达弧的2/10～3/10如图1。由于叶端进汽侧减少了一定的重量,会引起叶片频率的改变,可能导致叶片的裂纹和断裂。为此在大功率的汽轮机中,必须 Preface In condensing steam turbines, the phenomenon of water erosion on the blade surface can often be seen. As a result of water erosion, the surface of the blade gradually forms a rugged honeycomb surface. Water erosion area occupy a large part of the steam into the side of the leaf, sometimes up to 2/10 ~ 3/10 arc shown in Figure 1. As the tip of the intake side to reduce the weight of a certain, will cause changes in leaf frequency, leaf cracks and may lead to rupture. To this end in high-power steam turbine, must