Development of last-stage long blades for steam turbines

Tanuma, Tadashi

doi:10.1016/b978-0-08-100314-5.00013-0

Cited by 14 publications

(11 citation statements)

References 16 publications

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“…The blades of the last stage are much longer than those of the preceding stages upstream. For 3600-and 3000-rpm designs, last-stage long blades created recently by steam turbine manufacturers around the world are around 1 m in length [4].…”

Section: Introductionmentioning

confidence: 99%

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Natural Frequency Evaluation of Low-Pressure Stage Blade of a 210 MW Steam Turbine

Rani

Agrawal²

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Steam turbines rely heavily on the performance and reliability of their rotor blades. When a steam turbine blade fails, it can pose a risk to workers' life, need expensive repairs, and cause income losses. The failure mechanism differs from case to case and is typically quite complex. The last stage turbine blades are very long and rotate at high speed. In extreme dynamic loads, these big blades are the most susceptible to failure. So, the dynamic behaviour of the last stage steam turbine blade is of great importance and analysed by numerical simulation in this work. Mode shapes at natural frequencies of the blade at stationary condition and at different speeds of rotation are determined. A Campbell diagram is used to forecast the expected operational conditions that may result in blade resonant vibration.

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Section: Introductionmentioning

confidence: 99%

“…At running speed, the blade's natural frequencies must maintain a specified margin from a number of times the turbine rotation speed, which is the concept of dynamic design [4]. A variety of factors cause turbine blades to vibrate.…”

Section: Introductionmentioning

confidence: 99%

Natural Frequency Evaluation of Low-Pressure Stage Blade of a 210 MW Steam Turbine

Rani

Agrawal²

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…A set of blades is known as a stage, and there are many stages in a steam turbine. The blades in each stage are very important for the energy conversion efficiency [2,3], and the influence of the blades in the low-pressure stage on the performance of the steam turbine is particularly significant [4][5][6]. Therefore, the design of the blades has been the focus of research [7].…”

Section: Introductionmentioning

confidence: 99%

“…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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“…Аналогічні програми реалізовані на АЕС «Пакш» в Угорщині, з підвищенням теплової потужності до 108%, на АЕС «Богуніце» в Словаччині -до рівня 104%, на АЕС «Моховце» в Словаччині -до рівня 107%. Дуже багато робіт у світі присвячено дослідженням вчених з підвищення ефективності турбін [4][5][6][7][8][9].…”

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Improvement of the high pressure cylinder of the turbine K-1000-60/1500-2 of the Balakovo NPP 4-th block

Palkov¹,

Palkov²,

Ishchenko³

et al. 2020

Bulletin of the National Technical University «KhPI» Series: New Solutions in Modern Technologies

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Development of last-stage long blades for steam turbines

Cited by 14 publications

References 16 publications

Natural Frequency Evaluation of Low-Pressure Stage Blade of a 210 MW Steam Turbine

Natural Frequency Evaluation of Low-Pressure Stage Blade of a 210 MW Steam Turbine

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

Improvement of the high pressure cylinder of the turbine K-1000-60/1500-2 of the Balakovo NPP 4-th block

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