ENHANCED EVAPORATION OF THE DROPLETS OF CONDENSATE IN THE ASYMMETRICAL SHOCK WAVE ZONE

Sebastian Kornet; Janusz Badur

ENHANCED EVAPORATION OF THE DROPLETS OF CONDENSATE IN THE ASYMMETRICAL SHOCK WAVE ZONE

Abstract

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

Authors (2)

Sebastian Kornet
- Instytut Maszyn Przepływowych; Środowiskowe Studium Doktoranckie Zakład Konwersji Energii; Wydział Mechaniczny PG
Janusz Badur
- Instytut Maszyn Przepływowych Zakład Konwersji Energii

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Category:: Articles
Type:: artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
Published in:: Transactions of the Institute of Fluid-Flow Machinery pages 119 - 130,
ISSN: 0079-3205
Language:: English
Publication year:: 2015
Bibliographic description:: Kornet S., Badur J.: ENHANCED EVAPORATION OF THE DROPLETS OF CONDENSATE IN THE ASYMMETRICAL SHOCK WAVE ZONE// Transactions of the Institute of Fluid-Flow Machinery. -., nr. 128 (2015), s.119-130
Verified by:: Gdańsk University of Technology