Computer modeling temperature and strength characteristics of an ultra-supercritical loop-type steam turbine rotor
Abstract
Relevance. A global trends have emerged involving the continuous increase in demands for efficiency and reliability of power equipment, particularly ultra-supercritical steam turbines. Such turbines operate under challenging conditions of high temperatures and pressures, which can lead to significant thermomechanical stresses in rotor. Computer modeling is ideally suited to solving such problems. Therefore, research dedicated to strength calculations and determining the temperature characteristics of blades in high- and medium-pressure cylinders is highly relevant. These studies enable engineers to ensure the strength and durability of components in steam turbines.
Objective. To perform strength and temperature distribution calculations for the blades of high- and medium-pressure cylinders in a loop-type steam turbine with ultra-supercritical initial steam parameters.
Results. Data on the temperature field distribution in rotor blades of high- and medium-pressure cylinders were obtained. Using the results of the temperature calculations, the strength of the first rotor blades in the high-pressure cylinder was assessed under the influence of uneven temperature distribution and rotor rotation. Cooling of the first-stage turbine blades is achieved through convective heat exchange from the flow of cold steam from the last stage to the internal channels of the blades.
Conclusions. The results demonstrate the efficiency of the selected blade cooling method and the level of maximum stresses within the blades. One of the notable features of the operating conditions for loop-type turbine blades is the uneven heating that occurs both during transient and steady-state operating modes. Uneven heating leads to the formation of thermal stresses in the blades, which negatively affects their lifespan. Moreover, the high temperature of steam with ultra-supercritical parameters can significantly reduce the material's strength properties.
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W. Wróblewski, Numerical evaluation of the blade cooling for the supercritical steam turbine, Applied Thermal Engineering, Volume 51, Issues 1–2, 2013, Pages 953-962, ISSN 1359-4311, https://doi.org/10.1016/j.applthermaleng.2012.10.048.
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E. Strelnikova, D. Kriutchenko, V. Gnitko, K. Degtyarev. Boundary element method in nonlinear sloshing analysis for shells of revolution under longitudinal excitations, Engineering Analysis with Boundary Elements, 111, 2020, 78-87, https://doi.org/10.1016/j.enganabound.2019.10.008
