The Transient Thermal Stress of Steam Turbine Rotor

1971 ◽  
Vol 74 (627) ◽  
pp. 402-409
Author(s):  
Takaaki NAKADAIRA
Keyword(s):  
Thermal Stress ◽  
Steam Turbine ◽  
Turbine Rotor ◽  
Steam Turbine Rotor ◽  
Transient Thermal Stress ◽  
Transient Thermal

Effect of Steam Turbine Rotor Notch Fillet Radius on Stress and Deformation

2013 ◽  
Vol 860-863 ◽  
pp. 1770-1781
Author(s):  
Dong Mei Ji ◽  
M. H. Herman Shen ◽  
Shi Hua Yang ◽  
Gang Xia
Keyword(s):  
Finite Element ◽  
Thermal Stress ◽  
Finite Element Model ◽  
Steam Turbine ◽  
Element Model ◽  
Turbine Rotor ◽  
Critical Value ◽  
Steam Turbine Rotor ◽  
Fillet Radius ◽  
Start Up

A thorough investigation on the effect of a 320MW steam turbine rotor notch fillet radius on thermal and mechanical stresses during start up is presented. The approach consists of a shape design and analysis procedure which incorporates a finite element model. The finite element model is used to characterize the radius of the rotor notch fillet for ensuring the designed thermal and mechanical stress state/pattern and associated deflection during start-up. The results indicate that the notch fillet radius r has significant impact on the total stress of the rotor, in particular on thermal stress. It is determined that the thermal stress is decreased as the notch fillet radius r increases to a critical value. However, the thermal stress becomes saturated as the radius is increased to values larger than the critical value. The results also indicate that the rotor notch fillet radius has little effect on the deflection of the rotor during start-up. This investigation could be very useful to designers for construction of the design guidelines for steam turbine rotors.

Online Fatigue Monitoring System for Steam Turbine Rotor in Power Plants Considering Sub-Synchronous Oscillation

2012 ◽  
Vol 229-231 ◽  
pp. 1162-1165
Author(s):  
Shi Liu ◽  
Bin Li ◽  
Heng Liang Zhang ◽  
Cong Wang ◽  
Yang Shi ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Steam Turbine ◽  
Stress Responses ◽  
Power Plants ◽  
Life Cycle Management ◽  
Turbine Rotor ◽  
Analytical Models ◽  
Synchronous Oscillation ◽  
Steam Turbine Rotor ◽  
Fatigue Monitoring

This paper presents a system developed for online fatigue monitoring for steam turbine rotor in power plants. The system converts the plant transients to temperature and thermal stress responses using the analytical models modified by FEM. The torsional vibration caused by the possible sub-synchronous oscillation (SSO) phenomenon in power networks has been analyzed. The fatigue damage caused by thermal stress and SSO is studied based on the stress analysis and fatigue cumulation. The fatigue usage factor is computed using the rainflow cycle counting algorithm. The method can provide useful information in support of the unit’s life cycle management and efficient.

scholarly journals A prediction method of temperature distribution and thermal stress for the throttle turbine rotor and its application

2017 ◽  
Vol 21 (suppl. 1) ◽  
pp. 267-274
Author(s):  
Yu Yang ◽  
Zhenping Feng ◽  
Runda Lin
Keyword(s):  
Thermal Stress ◽  
Temperature Distribution ◽  
Steam Turbine ◽  
Operation Mode ◽  
Prediction Method ◽  
Turbine Rotor ◽  
Critical Parameters ◽  
Variable Load ◽  
Power Requirement ◽  
Steam Turbine Rotor

In this paper, a prediction method of the temperature distribution for the thermal stress for the throttle-regulated steam turbine rotor is proposed. The rotor thermal stress curve can be calculated according to the preset power requirement, the operation mode and the predicted critical parameters. The results of the 660 MW throttle turbine rotor show that the operators are able to predict the operation results and to adjust the operation parameters in advance with the help of the inertial element method. Meanwhile, it can also raise the operation level, thus providing the technical guarantee for the thermal stress optimization control and the safety of the steam turbine rotor under the variable load operation.

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