具有整体围带和凸台拉筋汽轮机长叶片阻尼振动特性实验研究  

Experimental Study on Vibration Characteristics of a Steam Turbine Blade with Integral Shroud and Tie Wire

作　　者：谢永慧[1] 吴君[1] 张荻[1] 周代伟 陆伟 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]上海电气电站设备有限公司上海汽轮机厂,上海200240

出　　处：《汽轮机技术》2011年第2期81-84,131,共5页Turbine Technology

基　　金：国家863高技术基金项目(2009AA04Z102);教育部新世纪优秀人才支持计划项目(NCET-07-0682)

摘　　要：阻尼围带和凸台拉筋结构在大型汽轮机叶片中被广泛采用来增加叶片阻尼,降低其振动应力。设计并建造了阻尼结构叶片振动特性实验台,对一具有阻尼围带和凸台拉筋汽轮机长叶片的阻尼器接触面施加不同转速下的正压力进行了振动特性测试,得到了不同转速正压力下叶片的频响曲线和模态阻尼比。试验结果表明:只有围带接触时,随着转速的增加,叶片模态阻尼比先增后减;围带和拉筋都接触时,也存在同样的现象。当转速大于2 600r/m in后,叶片的共振频率基本不变且模态阻尼比与自由叶片时基本一致。Integral shroud and tie wire have been widely used in steam turbine blades. A test rig was designed and built to test the vibration characteristics of blades with damping structure, and the vibration characteristics of a steam turbine long blade with shroud and tie wire were measured, the response curves and modal damping ratios of the blade under different contact pressures of dampers due to rotational speeds were obtained. The experimental results show that with the increase of rotational speed, modal damping ratio of the blade experience an increase period followed by a decrease period when there is only shroud contact. The effects are similar to the former when there are both shroud contact and tie wire contact. The resonant frequency of the blade remains essentially constant and the modal damping ratio is basically identical with the free blade when the rotational speed is above 2 600r/min.

关 键 词：汽轮机叶片 阻尼 振动 实验研究 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]