Steam turbine rotor design and rotor dynamics analysis

Kaneko, Yasutomo; Kanki, Hiroshi; Kawashita, Rimpei

doi:10.1016/b978-0-08-100314-5.00007-5

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…In the above-mentioned methods, the ideal blade shape is typically obtained by analyzing the aerodynamic performance according to the designed operating conditions. As steam turbines are operated under conditions such as high loading and high rotational speed, the blades are subjected to multiple complex loads, including centrifugal and aerodynamic loads [4,8,19,20].…”

Section: Introductionmentioning

confidence: 99%

Hot Blade Shape Reconstruction Considering Variable Stiffness and Unbalanced Load in a Steam Turbine

Zhou

Qiu

et al. 2020

Energies

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The blades in the low-pressure stage of a steam turbine must be reverse engineered according to the ideal blade shape due to the deformation of the blade during operation. A numerical analysis model of the flow field of the blades is proposed, and the model is solved by alternating between the fluid domain and the solid domain. Considering the imbalance of the load acting on the blade surface and the change in the blade stiffness matrix when the steam turbine is running, the Newton–Raphson method is used to calculate the pressure of the steam fluid on the blade surface and the change in the flow field caused by the blade deformation in each time step. The data are exchanged between the fluid domain and the solid domain after a single-step solution is completed. The simultaneous changes in the fluid domain and the solid domain are discretized in very short time steps, and the process of the blade deformation from stationary to running is simulated by accumulating the time steps. Finally, the trends in the change in the blade deformation and the aerodynamic load during the deformation process are analyzed according to the result of the reconstruction of the blade shape.

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Section: Introductionmentioning

confidence: 99%

Hot Blade Shape Reconstruction Considering Variable Stiffness and Unbalanced Load in a Steam Turbine

Zhou

Qiu

et al. 2020

Energies

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“…Mechanical contact between rotating and stationary elements occuring due to loss of clearance may lead to excessive vibration and material damage. Also rotor and blade vibrations affect turbine reliable operation and are subject to detailed analysis at the design phase and to online monitoring during turbine operation (Koneko et al, 2017). Rotordynamic analyses are performed at a very early stage of turbine design in order to avoid unsafe rotor resonances at various operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Applicability of Notch Stress-Strain Correction Methods to Low-Cycle Fatigue Life Prediction of Turbine Rotors Subjected to Thermomechanical Loads

Banaszkiewicz

Dudda

2018

Acta Mechanica Et Automatica

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The paper analyses the possibility of using analytical methods of notch stress-strain correction in low-cycle fatigue life predictions of steam turbine rotors operating under non-isothermal conditions. The assessment was performed by comparing strain amplitudes calculated using the Neuber and Glinka-Molski methods and those predicted by the finite element analysis (FEA) employing elastic-plastic material model. The results of investigations reveal that the Neuber method provides an upper bound limit, while the Glinka-Molski method results in a lower bound limit of strain amplitude. In the case of rotor heat grooves, both methods provide equally accurate results of notch strain amplitude and are suited to estimating lower and upper bound limits of low-cycle fatigue life under non-isothermal conditions.

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Dynamic Analysis of a High-Speed Rotor Supported by Optimized Bearings at Steady and Transient Operating Conditions

Beris

Bahrami

2022

J. Vib. Eng. Technol.

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Steam turbine rotor design and rotor dynamics analysis

Cited by 8 publications

References 12 publications

Hot Blade Shape Reconstruction Considering Variable Stiffness and Unbalanced Load in a Steam Turbine

Hot Blade Shape Reconstruction Considering Variable Stiffness and Unbalanced Load in a Steam Turbine

Applicability of Notch Stress-Strain Correction Methods to Low-Cycle Fatigue Life Prediction of Turbine Rotors Subjected to Thermomechanical Loads

Dynamic Analysis of a High-Speed Rotor Supported by Optimized Bearings at Steady and Transient Operating Conditions

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