Modification of the upwind schemes for the computation of condensing two-phase flows

Mei, Yuan; Guha, Ayan

doi:10.1243/09576509jpe146

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…Next, knowing the pressure and the vapour density, the temperature of the vapour phase is cal- culated from the equation of state. The liquid temperature is calculated from the relation proposed by Gyarmathy [6]:…”

Section: Flow Governing Equationsmentioning

confidence: 99%

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Numerical modelling of steam condensing flow in low and high-pressure nozzles

Dykas

Wróblewski

2012

International Journal of Heat and Mass Transfer

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Section: Flow Governing Equationsmentioning

confidence: 99%

“…So far, however, many researchers e.g. [6,7] have been using the ideal gas model for the steam flow. Generally, there are two main ways to include the real gas properties for the solution to the flow governing equations.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of steam condensing flow in low and high-pressure nozzles

Dykas

Wróblewski

2012

International Journal of Heat and Mass Transfer

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“…However, the pressure in multi-phase flow can be changed due to the water droplets, the approximation for pressure in wet-steam flows (eq. (12)) is used based on the study of Mei et al [24] The accuracy of flow variables can be modified by changing the equation of state as Virial equation or IAPWS-97, so further studies are needed to check the effects of equation of state used.…”

Section: Droplet Diametermentioning

confidence: 99%

Effects of Relative Position between a Stator and a Rotor on Steam Condensing Flow in Rotating Machinery

Kim¹,

Park

Baek³

2018

IJFMS

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Flow of steam is different from other gas flows and involves droplet generation in the flow field. This phasetransition affects not only flow aspects, but also machine performance in a negative way. These days, CFD is widely used in machine design and optimization processes, so phase-transition phenomena in steam flows should be considered in CFD to predict the internal flows precisely. In the past, non-equilibrium wet-steam model was implemented on in house code T-Flow and it was applied to steady calculations of a steam turbine model with changing stator/rotor interface. The results showed that mixing plane method is not appropriate to simulate steam condensing flow and frozen rotor method can be affected by relative position between a stator and a rotor. Therefore, steady wet-steam flows with non-equilibrium phase-transition were simulated for a steam turbine model in this study with 4 different stator-rotor positions and their effects on the wet-steam flow fields were investigated in detail.

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“…In TFlow, the pressure is used to derive from the total energy and fluid velocity based on the ideal gas law. The pressure can change due to the formation of water droplets, so the approximation of pressure in wet-steam flows is redefined using Equation (12) (Mei & Guha, 2006). Additionally, the accuracy of calculated flow variables can be increased by changing the equation of state via the Virial equation or IAPWS-97, so further studies on the effects of the equations of states used are needed.…”

Section: The Non-equilibrium Wet-steam Modelmentioning

confidence: 99%

Numerical analysis of non-equilibrium steam condensing flows in various Laval nozzles and cascades

Kim

Park

Kim

et al. 2017

Engineering Applications of Computational Fluid Mechanics

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When steam is used in fluid machinery, phase transition can occur that affects not only the flow fields but also machine performance. Therefore, to achieve an accurate prediction of steam condensing flow using computational fluid dynamics (CFD), phase-transition phenomena should be considered and a non-equilibrium wet-steam model is required. Such a model is implemented in this study using the in-house code T-Flow, and the flow fields -including phase-transition phenomena -in various Laval nozzles are examined. The results for multi-phase flows can be obtained in relatively short time by using mixture assumption and an inner-iteration method. The calculated results reflect the characteristics of the condensing flows well and are comparable with those obtained experimentally. Also, it was found that the superheating level of incoming steam can explain the tendency of condensation in the nozzles considered in a simple way. In addition, steam condensing flows in the blade cascades were simulated. As a result, the predicted blade loading agreed well with the experimental data and the superheating level at inlet was responsible for the condensation trend not only in the nozzles but also in the cascades. In future work, the characteristics of steam condensing flow in a steam turbine where complex flows and phase transition occur can be investigated using the presented model. ARTICLE HISTORY

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Modification of the upwind schemes for the computation of condensing two-phase flows

Cited by 8 publications

References 9 publications

Numerical modelling of steam condensing flow in low and high-pressure nozzles

Numerical modelling of steam condensing flow in low and high-pressure nozzles

Effects of Relative Position between a Stator and a Rotor on Steam Condensing Flow in Rotating Machinery

Numerical analysis of non-equilibrium steam condensing flows in various Laval nozzles and cascades

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