Studying Aerodynamic and Power Engineering Characteristics of the Exhaust Compartment in the Low Pressure Cylinder in the Range of Different Modes

Abstract

The numerical investigation of aerodynamic and power engineering characteristics of the exhaust compartment of high power steam turbine in the range of modes has been carried out. The wet steam with tabular parameters was used as an actuating medium. The compartment includes the last stage of the LPC with the preliminary provided interstage gap, working medium sampling system, wire damper communication and tip-clearance leakage, the exhaust manifold with the power system, the reducing sleeve with the pipe package and the chamber for the removal of moisture from the rim gap. The stream structure and the compartment characteristics in nominal and partial modes, the effect of injection and tip-clearance leakage depending on the mode are discussed. A low efficiency of the steam injection to provide the without-separation-streamline of the convex envelope of the diffuser under conditions of off-axis steam output from the last stage has been shown.