Hydraulic Design of the Bleeding Chamber for the Steam Turbine

Abstract

Hydraulic Design of the Bleeding Chamber for the Steam Turbine Hydraulic loss coefficients in the turbine flow discharge section were calculated on the basis of experimental determination of pressure losses in the turbine section designed for the heating bleeding in the steam turbine. It has been established that these loss coefficients are affected by the number of outlet branches, the diameters of outlet branches, a value of throat cross-section (narrow), radial cone cross-section through which the steam enters the bleeding section, and a relative flow of effluent medium (up to 35 %). The investigation was carried out using the aerodynamic test bench. The bleeding chamber was designed with the axial symmetry and had a large volume peculiar for the turbines with large uncontrolled steam bleedings. Consideration was given to the operation of the options of bleeding channels that have radial cone elements and also the options that have no radial cone. The technique was given that allows us to calculate pressure losses in the region between the flow passage of real steam turbine and the bleeding branches. This technique was developed based on the experimental investigation of bleeding channel carried out using the stationary aerodynamic test bench. It has been established that the use of two outlet branches instead of one results in a more substantial decrease of losses in the diffuser bleeding channel in comparison with the approach when the area of one outlet branch is increased two times.