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大型汽轮发电机组的可靠性对经济发电是极为重要的。叶片振动的测量是一种重要的设计手段,而在运行中监视叶片振动,可以对预防性检修起指导作用,这是提高可靠性的主要措施。本文介绍一家汽轮机制造厂在为更好地测量低压汽轮机动叶片的动力特性所做的不断努力中,振动测量仪器和试验技术的发展。威斯汀豪斯电气公司目前设计的1800转/分汽轮机低压叶片最长达44英寸(1118毫米),3600转/分汽轮机的低压叶片最长达31英寸(787毫米)。由于蒸汽进出口(进汽口、排汽口和抽汽口)和静叶片偏差的影响,沿圆周方向的汽流分布总不是十分均匀的。这使动
The reliability of large steam turbine generator is very important for economic power generation. Measurement of blade vibration is an important design tool, and monitoring blade vibration during operation can guide preventive maintenance, which is the main measure to improve reliability. This article describes the development of vibration measurement instrumentation and testing techniques that a turbine manufacturer is making to better measure the dynamic characteristics of low pressure turbine rotor blades. Westinghouse Electric currently designs turbines up to 44 inches (1118 mm) at 1800 rpm and up to 31 inches (787 mm) at 3600 rpm. Due to the influence of steam inlet and outlet (inlet, outlet and outlet) and vane deviation, the distribution of steam flow in the circumferential direction is not always uniform. This makes the move