Repozytorium publikacji - Politechnika Gdańska

In the low-pressure part of steam turbine, the state path usually crosses the saturation line in penultimate stages [4,5]. The formation and evolution of these droplets lower the performance of the wet stages of the turbines, and their effects on the efficiency are collectively known as wetness losses [4]. Nowadays, due to work of steam turbines at partial load, process of homogeneous and heterogeneous condensation still is current. Thermomechanical aspects of the nucleation, growth and interaction of water droplets in the steam turbine of large output are still poorly understood [1,2]. The flow in the low-pressure part of steam turbine is complicated and still requires thorough experimental and numerical analysis. The present work is concerned with investigation into coupled phenomena occurring in the supersonic section of the de Laval nozzle, characterized by the presence of shock the flow of condensing steam. The numerical simulations results were compared with the experiment carried out by Dykas et al. in 2013 on the half arc nozzles [3]. The present work includes simulations results of oscillation frequency of the shock wave and conditions for the enhancement evaporation of condensate on the asymmetrical shock wave. Novelty of our approach lies on modeling both the moment of initiation of a phase transition, as well as the moment of its reverse progress - called here re-vaporization of the condensate phase

Autorzy

• Sebastian Kornet link otwiera się w nowej karcie ,
• Janusz Badur