Wetness and Losses Control Using Geometry Considerations in Low Pressure Stages of Steam Turbines | ||||
| ERJ. Engineering Research Journal | ||||
| Article 7, Volume 23, Issue 2, April 2000, Page 119-149 PDF (1.01 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2020.71330 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| N. H. Mahmoud1; U. K. Singh2 | ||||
| 1Minufiya University, Shebin El-Kom, Egypt | ||||
| 2De Montfort University, Leicester, England | ||||
| Abstract | ||||
| This paper is concerned with investigating the effects of some geometrical characteristics of the cascade blades at low-pressure stages in steam turbines on the wet steam flow behaviour. The present work is based on a theoretical model combines a multistage three-dimensional semiviscous Euler solver with wet steam theory. Condensation of steam upon the surface of water droplets through the model is obtained on the basis of Lagrangian approach. Whilst the viscous effects in Euler solver are obtained using a body force treatment based on a simple mixing-length model. The blades geometrical characteristics is changed in the present study by cutting the blade at the trailing edge zone vertically and horizontally, or by profiling the blade end-wall. Present predictions show how the profiling of such a blade trailing edge and end wall are used separately or together to adjust and control both the flow behaviour and the situations of wetness accumulation. The present model predictions are in good agreement with the available experimental data. | ||||
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