Theoretical treatments of two-dimensional two-phase flows of steam and comparison with cascade measurements

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@article{560bee4d7ded40838a051995026f2ef3,
title = "Theoretical treatments of two-dimensional two-phase flows of steam and comparison with cascade measurements",
abstract = "During the course of expansion of steam in turbines, the state path crosses the saturation line and hence subsequent turbine stages operate with wet steam. These stages have lower thermodynamic efficiencies than those operating in the superheated region, and currently the phenomena contributing to the increased losses are not fully understood. The development of the nucleation theory has opened the way for the study of condensing flows in turbines. As, with the advances in numerical methods, the equations describing droplet nucleation and growth rates can be combined with the field conservation equations and the set treated numerically, which allows the behaviour of complex nucleating and wet steam flows in turbines to be analysed. This paper outlines and reviews wet steam calculation methods and discusses comparisons between numerical and experimental results. For the most part, the comparisons presented are based on work of the authors and their co-workers, but some more recent calculations by other investigators are also included.",
keywords = "nucleation, steam turbines, two-phase flows, cascades of blades, non-equilibrium flow, wet steam, fluid dynamics, time marching",
author = "Farhang Bakhtar and AJ White and Hisham Mashmoushy",
year = "2005",
month = jan,
day = "1",
doi = "10.1243/095440605x31454",
language = "English",
volume = "219",
pages = "1335--1355",
journal = "Institution of Mechanical Engineers. Proceedings. Part C: Journal of Mechanical Engineering Science ",
issn = "0954-4062",
publisher = "SAGE Publications",
number = "12",

}

RIS

TY - JOUR

T1 - Theoretical treatments of two-dimensional two-phase flows of steam and comparison with cascade measurements

AU - Bakhtar, Farhang

AU - White, AJ

AU - Mashmoushy, Hisham

PY - 2005/1/1

Y1 - 2005/1/1

N2 - During the course of expansion of steam in turbines, the state path crosses the saturation line and hence subsequent turbine stages operate with wet steam. These stages have lower thermodynamic efficiencies than those operating in the superheated region, and currently the phenomena contributing to the increased losses are not fully understood. The development of the nucleation theory has opened the way for the study of condensing flows in turbines. As, with the advances in numerical methods, the equations describing droplet nucleation and growth rates can be combined with the field conservation equations and the set treated numerically, which allows the behaviour of complex nucleating and wet steam flows in turbines to be analysed. This paper outlines and reviews wet steam calculation methods and discusses comparisons between numerical and experimental results. For the most part, the comparisons presented are based on work of the authors and their co-workers, but some more recent calculations by other investigators are also included.

AB - During the course of expansion of steam in turbines, the state path crosses the saturation line and hence subsequent turbine stages operate with wet steam. These stages have lower thermodynamic efficiencies than those operating in the superheated region, and currently the phenomena contributing to the increased losses are not fully understood. The development of the nucleation theory has opened the way for the study of condensing flows in turbines. As, with the advances in numerical methods, the equations describing droplet nucleation and growth rates can be combined with the field conservation equations and the set treated numerically, which allows the behaviour of complex nucleating and wet steam flows in turbines to be analysed. This paper outlines and reviews wet steam calculation methods and discusses comparisons between numerical and experimental results. For the most part, the comparisons presented are based on work of the authors and their co-workers, but some more recent calculations by other investigators are also included.

KW - nucleation

KW - steam turbines

KW - two-phase flows

KW - cascades of blades

KW - non-equilibrium flow

KW - wet steam

KW - fluid dynamics

KW - time marching

U2 - 10.1243/095440605x31454

DO - 10.1243/095440605x31454

M3 - Article

VL - 219

SP - 1335

EP - 1355

JO - Institution of Mechanical Engineers. Proceedings. Part C: Journal of Mechanical Engineering Science

JF - Institution of Mechanical Engineers. Proceedings. Part C: Journal of Mechanical Engineering Science

SN - 0954-4062

IS - 12

ER -