Development of a program code for calculating the flow paths of steam turbines with long blades

Abstract

Paper is devoted to the development of software code for calculating low-pressure cylinders of steam turbines. The program code divides the steam turbine compartment with a long blades into separate stages, and also calculates these stages by sections in height. The code is based on a 2D thermal design calculation technique, supplemented by refined coefficients of turbine cascade velocities. This approach makes it possible to significantly speed up the design and selection of optimal parameters for flow paths with long blades by reducing resource intensity. Thus, the developed code makes it possible to obtain the parameters necessary for profiling the blade apparatus of the flow path of the lowpressure cylinder of a steam turbine. The paper discusses the method of dividing the compartment by heat drops and the method of calculating the stage by cross-section. The flow path of the low-pressure cylinder is profiled. A calculation fluid dynamics (CFD) modelling of the designed last stage was performed. The results of the CFD calculation showed the absence of separations in the stage profiled according to the parameters obtained in the developed program code. And a comparison of efficiency based on the results of these two calculations showed a good agreement.