2D-simulation of wet steam flow in a steam turbine with spontaneous condensation

Abstract

Removal of condensates from wet steam flow in the last stages of steam turbines significantly promotes stage efficiency and prevents erosion of rotors. In this paper, homogeneous spontaneous condensation in transonic steam flow in the 2-D rotor-tip section of a stage turbine is investigated. Calculated results agree with experimental data reasonably well. On the basis of the above work, a 2-D numerical simulation of wet steam flow in adjacent root sections of a complex steam turbine stage was carried out. Computational results were analyzed and provide insights into effective removal of humidity.

Numerical solution of steam flow in a nozzle using different non-equilibrium condensation models

“…The results achieved by the 0-equation model are compared with the results of other non-equilibrium models with either two additional transport equations for the wetness and the total number of droplets, see e.g. [4,15] or with four additional transport equations for the moments, see e.g. [6].…”