Abstract
To solve the problem of the slow convergence of the geometry-based correction (GC) method in the design of a steam turbine blade, this paper proposes a geometry-load-based hybrid correction (GLHC) method. In this method, the deformation of the blade caused by the centrifugal load is still corrected by the GC method, while the deformation caused by the aerodynamic load is corrected by the load-based correction (LC) method instead of the GC method. The LC method updates the cold shape of the blade by reversely applying the aerodynamic load to the ideal shape according to the balance between the internal force generated by the deformation of the blade and the aerodynamic load acting on surface of the hot blade shape, thereby reducing the number of iterations by reducing the shape deviation in each step of the iteration. The GLHC method, which combines the GC and LC methods, is used to improve the design process. The efficiency of the GLHC and GC methods are compared with the maximum number of position deviations of the corresponding mesh nodes between the hot blade and ideal blade shapes, which acts as the criterion. The results show that the GLHC method reduces the number of iterations.
Highlights
Steam turbines are important power equipment for industrial production
Paper proposes a geometry-load-based hybrid correction (GLHC) method to solve the slow convergence of the iteration based on the geometry-based correction (GC) method in the current pre-deformation design
Method process to solvebased the slow convergence of the on the by the deformation from the cold blade shape to the hot blade shape was transferred to the deformation from First, the ideal shape to the new cold between shape; LCdeformation method had and less change errors than theaerodynamic the coupling relationship the the blade in the method was established by combining the load was analyzed to establish the iteration process based on the load-based correction (LC) method
Summary
Steam turbines are important power equipment for industrial production. During the operation of a steam turbine, high-temperature and high-pressure steam act on the blade surface and drive the spindle to rotate, thereby realizing energy conversion and output [1,2]. The traditional design method mainly involves obtaining an ideal blade shape according to the aerodynamic performance of a steam turbine in operation [6,7], the strength, modality and life of the blade are analyzed to ensure its reliability [2,8,9,10,11,12,13]. When superheated steam flows through the high-pressure cylinder to the low-pressure cylinder, the reduction in pressure and temperature will cause the superheated steam to appear as a vapor–liquid two-phase flow state in which steam and water droplets coexist This change will produce corresponding erosion and corrosion effects on the blade surface, namely, water erosion. A load-based correction (LC) method is proposed to analyze the coupling change and quickly reduce the correction, which is combined with the GC method to establish a geometry-load-based hybrid correction (GLHC) method to reduce the iteration steps and improve efficiency of the pre-deformation design
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