An equation set for non-equilibrium two phase flow, and an analysis of some aspects of choking, acoustic propagation, and losses in low pressure wet steam

Abstract In this paper we present a turbomachinery density-based CFD solver optimized for CPUs as well as GPUs, which accounts for complex thermodynamics including non-equilibrium condensation and two-phase flow, making extensive use of tabulation techniques. The two-phase flow is treated by means of the mono-dispersed Source-Term Euler-Euler model. The non-equilibrium wet-steam model is validated in classical nozzle test cases and its application in turbomachinery configuration is demonstrated in a well-documented steam turbine cascade in the context of classic RANS modeling. Finally, the LES-solver performance and scalability, together with its accuracy, are assessed and discussed on the basis of the well-known and theoretically relevant experiment by Comte-Bellot and Corrsin. For both, standard RANS computations, where an upwind schemes has been adopted, as well as for the LES computations, where a central scheme in skew-symmetric form has been employed, the solver shows remarkable computational speed and accuracy for non-ideal gas applications, rendering it suitable for more complex LES computations in steam turbine flows.

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NON-EQUILIBRIUM TWO-PHASE FLOW

Proceeding of International Heat Transfer Conference 9 ◽

10.1615/ihtc9.2020 ◽

1990 ◽

Cited By ~ 7

Author(s):

Geoffrey F. Hewitt

Keyword(s):

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Non Equilibrium

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NON-EQUILIBRIUM TWO-PHASE FLOW IN A HORIZONTAL T-JUNCTION

Chemical Engineering Communications ◽

10.1080/00986449508936333 ◽

1995 ◽

Vol 134 (1) ◽

pp. 211-230 ◽

Cited By ~ 1

Author(s):

HISHAM EL-DESSOUKY

Keyword(s):

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Non Equilibrium

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On the performance of a cascade of turbine rotor tip section blading in wet steam Part 3: Wake traverses

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406981522014 ◽

1997 ◽

Vol 211 (8) ◽

pp. 639-648 ◽

Cited By ~ 18

Author(s):

F Bakhtar ◽

H Mashmoushy ◽

O C Jadayel

Keyword(s):

Liquid Phase ◽

Two Phase Flow ◽

Turbine Rotor ◽

Phase Flow ◽

Wet Steam ◽

Flow Conditions ◽

Two Phase ◽

Blow Down ◽

The Third ◽

Phase Mixture

During the course of expansion of steam in turbines the fluid first supercools and then nucleates to become a two-phase mixture. The liquid phase consists of a large number of extremely small droplets which are difficult to generate except by nucleation. To reproduce turbine two-phase flow conditions requires a supply of supercooled vapour which can be achieved under blow-down conditions by the equipment employed. This paper is the third of a set describing an investigation into the performance of a cascade of rotor tip section profiles in wet steam and presents the results of the wake traverses.

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