Researches on Impact-damping of Integral Shroud Blades of Turbine Machinery
LU Xuxiang1,2;HUANG Shuhong1;LIU Zhengqiang2;LI Luping2;XU Damao2
(1 School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2 School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, China)
The integral shroud blades with contact-impact damping structure in tips have advantages of vibration reduction, convenient installation and low precision for manufacture. They have been successfully applied on stream turbines for safe operation over many years. But the researches on the damping mechanism and damping effect for such a structure are rather limited. Combined with researches on vibro-impact theory, the research status of integral shroud blades are summarized from the aspects such as the characteristic of vibro-impact, dynamic model, numerical method and experimental studies. Several key problems for future research are also presented.