汽轮机末级长叶片是影响大机组安全运行的关键部件。发电设备单机容量不断增大,汽轮机末级叶片长度不断加长,叶片的刚性随之下降,级焓降大,汽流出口速度高,末级长叶片颤振故障日益加剧。叶片颤振故障不仅耗费大量的人力、财力,而且常常造成灾难性的后果。 The long blade at the end of the steam turbine is a key component affecting the safe operation of large units. The unit capacity of power generation equipment is continuously increasing, the length of the final stage blades of steam turbines is lengthened, the rigidity of the blades is decreased, the enthalpy of the stage is decreased, the flow exit speed is high, and the flutter failure of the final stage blades is aggravated. Blade flutter failure not only consume a lot of manpower and financial resources, but also often have catastrophic consequences.