The Distance Attenuation of Acoustic Emission Signals in Turbine Runners
Initiation of blade cracks in Francis turbine runners endangers the safety operation of power stations, so it is crucial to detect the cracks before emergencies happen. This article is a preliminary study of applying acoustic emission (AE) technique to detecting the large-scale turbine runners. A series of experiments had been carried out on an HLA286a-LJ800 Francis turbine runner. The attenuation characteristics due to propagation distance were studied. From the tests, it is concluded that AE signals are detectable after propagating at a distance of 6 m. The propagation distance is the major factor of attenuation. As a result, although attenuation is incurred, it is feasible to apply AE technique to monitoring crack signals in runners. However, it depends on the understanding of background noise and extraction of right signals.
Acoustic emission Francis turbine runner Blade Distance attenuation Crack
Xianghong Wang Hongwei Hu Yimin Shao Junqing Fu
School of Automobile and Mechanical Engineering, Changsha University of Science and Technology, 960, 2nd Section, Wanjiali South Road, Changsha 410004, China
国际会议
湘潭
英文
262-267
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）