Performance evaluation of condensing flow behavior considering magneto hydrodynamics field effects

Abstract

In industrial equipment, the losses and damages due to the spontaneous non-equilibrium condensation phenomenon are one of the biggest concerns of industry managers. This study focused on wetness loss rate, condensation loss, erosion rate, and kinetic energy of condensing steam flow in industrial equipment (Moses Stein nozzle, IWSEP nozzle, Dykas/ Bakhtar laboratory stationary cascades of a steam turbine) with the magnetic field injecting through equipment walls. The mathematic modeling of condensing flow including the magneto hydrodynamics (MHD) equation, are combined with the non-equilibrium condensation model and k-wSST model, which were verified and established by theory and experiments on an Eulerian-Eulerian approach accounts. Wet steam model is used to investigate the flow behavior between the turbine blades, due to the sonication and non-equilibrium phenomena. At first, such model has been carefully validated against the available experimental data. Then, MHD injecting to flow through walls. At finally, the condensing flow field damage behaviors, such as condensation shock, liquid mass fraction, nucleation zone, wetness loss rate, and erosion rate, are controlled by MHD fields. Finally, each part of the losses is derived from the condensation and wetness loss, which were analyzed. The Findings show that MHD fields play an important role in the nucleation zone. The mass-averaged liquid mass fraction and the average radius of droplets at the outlet of industrial equipment drop sharply with MHD fields. The MHD field injection exhibits 34%, 10% and 25% reduction in condensation loss, the number of droplets due to nucleation phenomenon and the average radius of droplets at the outlet of the Bakhtar laboratory stationary cascades of a steam turbine, respectively. For other equipment the same trend has been predicted.