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Numerical Modelling of Dry and Wet Steam Flows in Converging-Diverging Nozzles

  • Hasril Hasini
  • Norhazwani Abd Malek
  • Mohd. Zamri Yusoff
Conference paper

Abstract

Problem of water erosion in low pressure steam turbine stage is serious due to the formation of water droplets which travel at supersonic speed within the blade channel. The impact of these droplets could cause damage to turbine blade, and effort to understand the underlying mechanism of this type of flow has been devoted many years ago. This chapter describes the modelling of dry superheated and wet steam flows in two converging-diverging nozzles. The modelling is carried out using both in-house developed and commercial CFD code FLUENT. In this work, emphasis is given on understanding the capability of commercial CFD code to accurately predict the behaviour of dry and wet steam flow through the nozzles. The pressure and Mach number prediction using the commercial as well as in-house code show good agreement with one-dimensional analytical solution and experimental data. Quantitatively, further refinement to the geometrical mesh and mathematical model through user-defined function is desirable to increase the accuracy of the prediction using commercial CFD code.

Keywords

Mach Number Steam Turbine Quadrilateral Mesh Mach Number Distribution Nozzle Distance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 2015

Authors and Affiliations

  • Hasril Hasini
    • 1
  • Norhazwani Abd Malek
    • 1
  • Mohd. Zamri Yusoff
    • 1
  1. 1.Centre for Advanced Computational Engineering, College of EngineeringUniversiti Tenaga Nasional, Jalan IKRAM-UNITENKajangMalaysia

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