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Numerical Analysis of the Aeroelastic Behaviour for the Last Turbine Stage in 3D Transonic Flow

Numerical Analysis of the Aeroelastic Behaviour for the Last Turbine Stage in 3D Transonic Flow
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摘要 An understanding of the physics of the mutual interaction between gas flow and oscillating blades, and the development of predictive capabilities is essential for improving overall efficiency, durability and reliability. In this study presented the algorithm proposed involving the coupled solution of 3D unsteady flow through a turbine stage and dynamic problem for rotor blades motion by action of aerodynamic forces without separating outer and inner flow fluctuations. There has been performed the calculations for the last stage of the steam turbine under design and off-design regimes. It has investigated the mutual influence of both outer flow non-uniformity and blades oscillations. It has shown that amplitude-frequency spectrum of blade oscillations contains the high frequency harmonics, corresponding to rotor moving one stator blade pitch, and low frequency harmonics caused by blade oscillations and flow non-uniformity downstream from the blade row. An understanding of the physics of the mutual interaction between gas flow and oscillating blades, and the development of predictive capabilities is essential for improving overall efficiency, durability and reliability. In this study presented the algorithm proposed involving the coupled solution of 3D unsteady flow through a turbine stage and dynamic problem for rotor blades motion by action of aerodynamic forces without separating outer and inner flow fluctuations. There has been performed the calculations for the last stage of the steam turbine under design and off-design regimes. It has investigated the mutual influence of both outer flow non-uniformity and blades oscillations. It has shown that amplitude-frequency spectrum of blade oscillations contains the high frequency harmonics, corresponding to rotor moving one stator blade pitch, and low frequency harmonics caused by blade oscillations and flow non-uniformity downstream from the blade row. Keywords 3D unsteady flow - stator-rotor interaction - blades oscillations CLC number TK26
出处 《Journal of Thermal Science》 SCIE EI CAS CSCD 2004年第4期328-333,共6页 热科学学报(英文版)
关键词 3D UNSTEADY flow stator-rotor interaction BLADES oscillations. 3D unsteady flow stator-rotor interaction blades oscillations
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参考文献2

  • 1Gnesin,V I.A Numerical Study of 3D Flutter in Turbomachines Using Fluid-Structure Coupled Method[].Journal of Engineering Mechanics ASCE.1999
  • 2Gnesin,V I,Kolodyazhnaya,L V.Numerical Modelling of Aeroelastic Behaviour for Oscillating Turbine Blade Row in 3D Transonic Ideal Flow[].Problems in Machinery Engineering.1999

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