Thermal elongations in steam turbines with welded rotors made of advanced materials at supercritical steam parameters

Kosman, Wojciech; Roskosz, Maciej; Nawrat, Krzysztof

doi:10.1016/j.applthermaleng.2009.05.016

Cited by 22 publications

(8 citation statements)

References 4 publications

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“…It is commonly indicated by developers and researchers that materials currently used for critical turbine components such as rotors, inner casings, and valves are inadequate for use in USC or A-USC conditions. Therefore, intensive research and development efforts have been invested in developing materials that can withstand high temperature and pressure [8,9]. At the same time, research on cooling systems is being carried out to prevent fatigue failure arising at critical locations such as blade roots and turbine casings due to very high temperature [10,11].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a multi-stage ultra-supercritical steam turbine using computational fluid dynamics

Jang

Kang

Lee

et al. 2015

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Performance analysis of a multi-stage ultra-supercritical steam turbine using computational fluid dynamics

Jang

Kang

Lee

et al. 2015

Applied Thermal Engineering

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“…In order to increase steam turbine power generation capacity from its original design value, it is necessary to increase steam inlet temperature and pressure to higher values [8]. These changes make it necessary to resolve issues related with the steam turbine design and/or operation procedures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotor Diameter on the Thermal Stresses of a Turbine Rotor Model

Dávalos

García

Urquiza

et al. 2016

International Journal of Turbo &Amp; Jet-Engines

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Thermal stresses in a simplified steam turbine rotor model during a cold startup are analyzed using finite element analysis (FEA). In order to validate the numerical model, an experimental array is developed in which a hollow cylinder is heated with hot air in the external surface. At the thick wall of the cylinder, temperature distribution is measured in real time, while at the same time an algorithm computes thermal stresses. Additional computational fluid dynamics (CFD) calculations are made to obtain magnitudes of velocity and pressure in order to compute convective heat transfer coefficient. The experimental results show good agreement with the FEA computations. To evaluate the effect of rotor diameter size, FEA computations with variation in external and internal diameters are performed. Results show that thermal stresses are proportional to rotor diameter size. Also, zones of higher stress concentration are found in the external and internal surfaces of the rotor.

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“…Various thermal and mechanical inertia effects influence the operational characteristics of steam turbines and require dynamic models for accurate predictions of transient states (Celins et al, 2017). Differences in thermal expansion between rotors and casings result in altered axial clearances and their unsafe decrease during turbine operation must be avoided (Kosman et al, 2009). Mechanical contact between rotating and stationary elements occuring due to loss of clearance may lead to excessive vibration and material damage.…”

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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Thermal elongations in steam turbines with welded rotors made of advanced materials at supercritical steam parameters

Cited by 22 publications

References 4 publications

Performance analysis of a multi-stage ultra-supercritical steam turbine using computational fluid dynamics

Performance analysis of a multi-stage ultra-supercritical steam turbine using computational fluid dynamics

Effect of Rotor Diameter on the Thermal Stresses of a Turbine Rotor Model

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

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