Investigation on Losses Connected with Steam Condensation in Turbine Cascades

Obviously, the last mystery of steam turbines is the method of condensation of the steam flowing through the LP portion of a turbine. For the condensation of flowing steam, the mathematical method used is based on homogeneous condensation and binary nucleation of water droplets with a representative chemical impurity of NaCl. There are brief examples of physical and mathematical models. For the measurement of steam flow with condensation in the 2D nozzle-blade cascades of the first wet stage of the low-pressure portion of a fossil-fuel condensing steam turbine and of a similar cascade of the LP part of a nuclear turbine, the homogeneous and binary nucleation numerical models are then used. It describes and analyzes the key effects of the calculations. For experimental investigation, humid air was used to investigate certain two-phase flow phenomena, e.g. g. Modelling of water vapor condensation in the discharge of a steam turbine’s LP nozzle cascade. In the experimental nozzle cascade, condensation results in transonic flow confirmed the losses. Further losses are associated with the effects of steam chemistry on the surfaces of turbine blades in the transition zone of the LP component of the steam turbine.

Author (s) Details

Miroslav Šťastný
Department of Power System Engineering, Faculty of Mechanical Engineering, University of West Bohemia, Univerzitní 22, 306 14 Pilsen, Czech Republic.

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