轴流式叶片的流固耦合振动特性分析
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摘要
采用流固耦合技术,求解流体与固体的耦合方程,对轴流式叶片进行了振动特性分析,分别计算了叶片在空气中和水中的固有频率;并比较了轴流式叶片在空气中与水中固有频率的变化,分析了叶片在水中的振型。结果表明,叶片在水中的各阶固有频率较其在空气中均有所降低,且其降低程度具有非线性的特点。通过对轴流式叶片在水中八阶模态图的分析,表明了轴流式叶片外部靠近出水边的地方较为敏感。
The fluid-solid coupling tech is adopted to seek for the fluid and solid coupling equation.The dynamic characteristics for the axial flow blades is analysed.The natural frequency of the blades was calculated in water and in air respectively.The variations in natural frequency of the axial flow blades in air and in water are compared;and the vibration mode of the blades is analysed.The results indicate that each order natural frequency of the blades has a slighter drop in water than in air,whose dropping degree is characterized by the non-linearity.The analysis of 8-order mode of the axial-flow blades in water shows that the place close to outlet of the outside of the axial flow blades is much more sensitive.
The fluid-solid coupling tech is adopted to seek for the fluid and solid coupling equation.The dynamic characteristics for the axial flow blades is analysed.The natural frequency of the blades was calculated in water and in air respectively.The variations in natural frequency of the axial flow blades in air and in water are compared;and the vibration mode of the blades is analysed.The results indicate that each order natural frequency of the blades has a slighter drop in water than in air,whose dropping degree is characterized by the non-linearity.The analysis of 8-order mode of the axial-flow blades in water shows that the place close to outlet of the outside of the axial flow blades is much more sensitive.
引文
[1]谷朝红,姚熊亮,陈起富(Gu Chao-hong,Yao Xiong-liang,Chen Qi-fu).水轮机部件流固耦合振动特性研究(Study onfluid-solid coupling dynamic characteristics for the component of hydraulic turbines)[J].大电机技术(Large Electric Ma-chine and Hydraulic Turbine),2001,(6):47-52.
[2]邬海军(Wu Hai-jun).水轮机叶片三维有限元刚强度与振动特性研究(Three dimensional finite element rigidity/strength and vibration characteristics analysis of blade of hydrodynamic turbine)[D].西安:西安理工大学(Xi'an:Xi'an Uni-versity of Technology),2005.
[3]居荣初,曾心传(Ju Rong-chu,Zeng Xin-chuan).弹性结构与液体的耦联振动理论(Elastic structure-liquid coupling dy-namic theory)[M].北京:地震出版社(Beijing:Earthquake Publishing House),1983.
[4]Saeed Moaveni.Finite element analysis:Theory and applications with ANSYS(Second Edition)[M].New York:Addi-son Wesley/Pearson,2003.
[5]王少波(Wang Shao-bo).混流式水轮机转轮动力特性分析及综合优化设计(Dynamic characteristic analysis and syn-thetical optimization of francis turbine's runner)[D].郑州:郑州机械研究所(Zhengzhou:Zhengzhou Research Institute ofMechanical Engineering),2003.
[6]Volker Carstens,Ralf Kemme,Stefan Schmittb.Coupled simulation of flow-structure interaction in turbomachinery[J].Aerospace Science and Technology,2003,(7):298-306.
[2]邬海军(Wu Hai-jun).水轮机叶片三维有限元刚强度与振动特性研究(Three dimensional finite element rigidity/strength and vibration characteristics analysis of blade of hydrodynamic turbine)[D].西安:西安理工大学(Xi'an:Xi'an Uni-versity of Technology),2005.
[3]居荣初,曾心传(Ju Rong-chu,Zeng Xin-chuan).弹性结构与液体的耦联振动理论(Elastic structure-liquid coupling dy-namic theory)[M].北京:地震出版社(Beijing:Earthquake Publishing House),1983.
[4]Saeed Moaveni.Finite element analysis:Theory and applications with ANSYS(Second Edition)[M].New York:Addi-son Wesley/Pearson,2003.
[5]王少波(Wang Shao-bo).混流式水轮机转轮动力特性分析及综合优化设计(Dynamic characteristic analysis and syn-thetical optimization of francis turbine's runner)[D].郑州:郑州机械研究所(Zhengzhou:Zhengzhou Research Institute ofMechanical Engineering),2003.
[6]Volker Carstens,Ralf Kemme,Stefan Schmittb.Coupled simulation of flow-structure interaction in turbomachinery[J].Aerospace Science and Technology,2003,(7):298-306.
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