Testing apparatus for steam turbine blade with shroud ring and boss lashing wire structures

Abstract

Disclosed in the invention is a testing apparatus for steam turbine blade with shroud ring and boss lashing wire structures. The testing apparatus comprises a testing rack, a blade root fixing device, two sets of loading devices, a vibration excitation device, and a measurement device. The blade root fixing device is fixed at a base plate of the testing tack. The loading devices are fixed in groove holes of side plates by two loading plate support units; one set of the loading device is used for providing a circumferential torque for the shroud ring of the turbine blade; and the other set of loading device is used for providing a circumferential torque for the boss lashing wire of the turbine blade. The vibration excitation device is fixed at groove holes of the side plates by two exciter support standing plates. And the measurement device is fixed at the testing rack. According to the invention, the testing apparatus can be used for simulating measurement of steam turbine blades that have different lengths and have the shroud ring and boss lashing wire structures on the actual operation condition, thereby laying the foundation of further development of the steam turbine blade with the shroud ring and boss lashing wire structures.

Description

【Technical field】 [0001] The invention relates to the technical field of experimental devices, in particular to a test device for a steam turbine blade with a shroud and a gold-plated boss structure. 【Background technique】 [0002] As an important power device in the electric power industry, industrial driving force and ship drive, the safety and reliability of the steam turbine are crucial to the national economy and national security. Operating experience shows that blade damage is the main cause of steam turbine accidents, and most blade damage is caused by blade vibration fatigue. [0003] The commonly used method to ensure the safety of blade vibration is to avoid the natural vibration frequency of the blade or increase the vibration damping of the blade. It is an effective method to develop a damping blade with a damping shroud and a boss pull. Dry friction damping is highly nonlinear, and no model can accurately describe all damping characteristics, and little is kno...

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Problems solved by technology

The main reasons are the following two aspects: on the one hand, the metal damping characteristics under the non-rotating system still need to be further clearly understood, and scholars mainly focus on studying the metal damping characteristics under this system; on the other hand, under the real rotating state Testing the damped vibration characteristics of blades is difficult and expensive

[0004] Based on the above reasons, although the damping shroud and boss pull gold structure have been widely used on blades, the relevant research, especially the mechanism research, is still insufficient, especially for its performance under actual operating conditions. Know little

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