关于汽轮机末级长叶片受离心力和蒸汽动力作用产生扭曲变形问题的思考

Some Ideas about the Twisting of Last Stage Long Blades under the Action or Centrifugal and Steam Forces

该文提出了在保证低压末级长时片强度、振动设计的前提下，将叶型的正向自由扭曲量随叶高的变化作下同程度加大，以使叶片在产生反向扭曲变形后各个截面均能回复到设计工况下的最佳位置．

Abstract The paper suggests that, under the prerequisite of warranting the designed strength and vibration properties of long last stage blades,their positive free twist should be stepped up in various degrees along blade height,so that, after untwisting during operation, each section may retrive its designed orientation.