Исследование аэродинамических и энергетических характеристик выхлопного отсека ЦНД «ступень-диффузор»

Abstract

The numeric investigation of aerodynamic and power characteristics of the last stage of LPC of a powerful steam turbine with the preswitched on channel of the stage gap and with the input section of the diffuser channel of the exhaust branch pipe for the stationary mode was performed using the properties of the wet steam on the basis of one-velocity approximation and the equilibrium condensation. A three-dimensional structure, and averaged aerodynamic characteristics of compartment elements and power characteristics of the stage channel have been given. The influence produced by geometric elements, in particular moisture suction slots, damper wire tie and peripheral integrally machined rack shroud on the flow in the stage channels has been analyzed. The effect of the jet of the over-shroud leakage and also jet parameters on the diffuser flow is discussed including the influence of the damper wire tie on the power characteristics of the stage. The effect of the possible steam flow through the blade slot near the damper wire tie has been studied.