燃气轮机压气机动叶振动特性研究  

Research on Vibration Characteristics of the Compressor Rotor Blades for Some Type Gas Turbine

作　　者：李洪松 刘永葆[1,2] 余又红[1,2] 贺星[1,2] LI Hongsong LIU Yongbao YU Youhong HE Xing(Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, China College of Power Engineering, Naval University of Engineering, Wuhan 430033, China)

机构地区：[1]海军工程大学舰船动力工程军队重点实验室,武汉430033 [2]海军工程大学动力工程学院,武汉430033

出　　处：《燃气轮机技术》2017年第3期41-45,共5页Gas Turbine Technology

基　　金：国家部委基金资助项目(4010303010402)

摘　　要：针对某型燃气轮机的压气机第八级动叶断裂故障,对其进行振动特性研究。根据制造数据建立三维实体模型,利用有限元软件进行模态分析,得到压气机在额定转速下该级动叶的前六阶自振频率、振型以及各阶等效应力图,结果表明,叶尖处振动的变形量相对较大,叶片根部区域应力较为集中。根据激振力的激振频率和不同转速下动叶的自振频率绘制坎贝尔图,进行共振分析,发现当压气机的转速在7 300 r/min附近时,动叶易产生二阶扭转振动和四阶复合振动。分析结果为进一步研究该级动叶的断裂故障和防共振措施提供依据。The eighth stage rotor blade of the compressor for some type gas turbine is adopted to research the vibration characteristics. The solid model is established based on the manufacturing data, and the modal analysis is conducted on the finite element model by finite element software. The first six natural frequencies, vibration modes and equivalent stress diagrams of the rotor blade are given when the compressor work under rated speed. The results shows that the large value of vibration transformation appears at blade tip and the large value of Von Mises stress concentrate on blade root. The Campbell diagram is drawn based on the excitation force frequency and natural frequencies of rotor blade under different rotating speeds to conduct resonance analysis. When the compressor works at nearly 7 300 r/min, the second order torsion vibration and the fourth order coupled vibration of this rotor blade easily happen. The research provides evidence for further studying the rotor broken fault and the measures against resonance.

关 键 词：压气机 动叶 模态分析 共振分析 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]