摘要
采用流固耦合的方法对某压气机转子叶片进行气动弹性数值模拟计算,将定常计算结果与实验结果进行对比,验证计算方法的正确性。在此基础上,采用单向流固耦合计算对叶片进行结构动力学分析,把非定常计算得出的气动力载荷转化为结构动力学分析中的载荷压力场形式,分析叶片在气动力作用下的瞬态响应,并进行模态分析。所得结果表明:叶片在气动力作用下承受较大的交变应力幅值,容易发生高周疲劳;产生了较大的动应力,最大应力值位于叶根前缘。通过分析叶片的各阶模态振型和危险点的位置,可以为叶片的疲劳设计分析提供依据,加强压气机转子叶片运行的安全可靠性。
Fluid-solid coupling method is used for numerical simulating calculation on aeroelasticity of rotor blades of some compressor,and result of steady-state computation and experimental result are compared to verify veracity of this computation method.By means of one-way fluid-solid coupling calculation,this paper carries out structural dynamics analysis on blades which is to transfer aerodynamic load obtained from unsteady computation to the form of load pressure field for structural dynamics analysis.It analyzes transient response of blades under aerodynamic force and conducts modal analysis as well.Results indicate that blades may bear larger amplitude of alternating stress under aerodynamic force and be easy to produce high-cycle fatigue.In addition,larger dynamic stress is produced and the maximum stress occurs at the leading edge of blade root.Analysis on modal shape of each order and locations of dangerous points may provide basis for design and analysis on fatigue of blades as well as strengthen operational security and reliability of blades.
出处
《广东电力》
2016年第5期1-5,19,共6页
Guangdong Electric Power
基金
中国博士后科学基金面上资助项目(2015M570696)
中国南方电网有限责任公司科技项目(GDKJ00000005)
关键词
流固耦合
气动力
瞬态响应
模态分析
高周疲劳
fluid-solid coupling
aerodynamic force
transient response
modal analysis
high-cycle fatigue
