BIAN Long,FAN Zhifei,ZHU Mingliang,et al. Analysis and safety evaluation of steam turbine last stage blade vortex-induced response under deep peak shaving conditions[J]. Journal of Mechanical Strength,2025,47(9):197-204.
BIAN Long,FAN Zhifei,ZHU Mingliang,et al. Analysis and safety evaluation of steam turbine last stage blade vortex-induced response under deep peak shaving conditions[J]. Journal of Mechanical Strength,2025,47(9):197-204. DOI: DOI:10.16579/j.issn.1001.9669.2025.09.019.
Analysis and safety evaluation of steam turbine last stage blade vortex-induced response under deep peak shaving conditions
To compensate for the intermittency of renewable energy generation
coal-fired power units are required to operate under low-load conditions over a long time
which causes the last stage blades of steam turbine low-pressure cylinders under small flow conditions persistently
leading to increased dynamic stresses and fatigue damage in the blades. To evaluate the safety of these last-stage blades
the fluid-structure interaction analysis of the last two-stage flow path and last stage rotating blades were conducted for a 660 MW air-cooled steam turbine under typical operating conditions. The results demonstrate that as the load decreases
both the maximum equivalent stress and deformation of the last stage rotating blades gradually diminish first
then slightly increasing. The maximum equivalent stress of the last stage rotating blades remains consistently below the material’s yield strength
indicating that the blades are in the stage of elastic deformation and no plastic deformation has occurred. Using the Goodman curve analysis method for the high-cycle fatigue life assessment of the last stage rotating blades
the dynamic stress levels of the last stage rotating blades fall within the safe zone of the Goodman curve
indicating that there is no risk of fatigue damage to the blades.
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