CFD analysis of unsteady flows due to supercritical heat addition in high speed condensing steam

Research output: Contribution to journalArticle

Abstract

This study is mainly to investigate the unsteady flows due to supercritical heat addition in high speed condensing steam in steam turbines. To achieve this, condensation flow characteristic is investigated on 2D converging-diverging nozzle. A Computational Fluid Dynamics (CFD) code (FLUENT package) that adopted the Eulerian-Eulerian approach for modeling wet steam flow, was used. The condensing flow is governed by the compressible Navier-Stokes equations in conjunction with a wet steam multiphase model. The turbulence model selected for this work is Spalart Allmaras model which is based on the Reynolds Averaged Navier Stoke (RANS) model available in FLUENT. Results are then compared with previous researchers that use different methods including user defined code and experiment. The importance of this research study is to determine the accuracy of the software and method used and to compare the results with other researchers.The current work shows good agreement with the experimental data done by Skilling [1] and 2D calculations done by Yusoff et al. [2]. It is found from the numerical simulation results that the supercritical heat addition has caused the flow in the condensing steam to retard and gives rise to pressure oscillations. The unsteady supercritical heat addition reveals promising results indicating the capability of FLUENT to calculate this phenomenon which might cause instability in turbine channel.

Original languageEnglish
Pages (from-to)37-42
Number of pages6
JournalJurnal Teknologi
Volume76
Issue number10
DOIs
Publication statusPublished - 11 Oct 2015

Fingerprint

Unsteady flow
Dynamic analysis
Computational fluid dynamics
Steam
Steam turbines
Turbulence models
Navier Stokes equations
Condensation
Nozzles
Turbines
Hot Temperature
Computer simulation
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

@article{26b917b24c654e718dec7e3c169ff83b,
title = "CFD analysis of unsteady flows due to supercritical heat addition in high speed condensing steam",
abstract = "This study is mainly to investigate the unsteady flows due to supercritical heat addition in high speed condensing steam in steam turbines. To achieve this, condensation flow characteristic is investigated on 2D converging-diverging nozzle. A Computational Fluid Dynamics (CFD) code (FLUENT package) that adopted the Eulerian-Eulerian approach for modeling wet steam flow, was used. The condensing flow is governed by the compressible Navier-Stokes equations in conjunction with a wet steam multiphase model. The turbulence model selected for this work is Spalart Allmaras model which is based on the Reynolds Averaged Navier Stoke (RANS) model available in FLUENT. Results are then compared with previous researchers that use different methods including user defined code and experiment. The importance of this research study is to determine the accuracy of the software and method used and to compare the results with other researchers.The current work shows good agreement with the experimental data done by Skilling [1] and 2D calculations done by Yusoff et al. [2]. It is found from the numerical simulation results that the supercritical heat addition has caused the flow in the condensing steam to retard and gives rise to pressure oscillations. The unsteady supercritical heat addition reveals promising results indicating the capability of FLUENT to calculate this phenomenon which might cause instability in turbine channel.",
author = "{Abd Malek}, Norhazwani and Jamaluddin, {Syarir Akram} and Yusoff, {Mohd Zamri} and Hasril Hasini",
year = "2015",
month = "10",
day = "11",
doi = "10.11113/jt.v76.5791",
language = "English",
volume = "76",
pages = "37--42",
journal = "Jurnal Teknologi (Sciences and Engineering)",
issn = "0127-9696",
publisher = "Penerbit Universiti Teknologi Malaysia",
number = "10",

}

CFD analysis of unsteady flows due to supercritical heat addition in high speed condensing steam. / Abd Malek, Norhazwani; Jamaluddin, Syarir Akram; Yusoff, Mohd Zamri; Hasini, Hasril.

In: Jurnal Teknologi, Vol. 76, No. 10, 11.10.2015, p. 37-42.

Research output: Contribution to journalArticle

TY - JOUR

T1 - CFD analysis of unsteady flows due to supercritical heat addition in high speed condensing steam

AU - Abd Malek, Norhazwani

AU - Jamaluddin, Syarir Akram

AU - Yusoff, Mohd Zamri

AU - Hasini, Hasril

PY - 2015/10/11

Y1 - 2015/10/11

N2 - This study is mainly to investigate the unsteady flows due to supercritical heat addition in high speed condensing steam in steam turbines. To achieve this, condensation flow characteristic is investigated on 2D converging-diverging nozzle. A Computational Fluid Dynamics (CFD) code (FLUENT package) that adopted the Eulerian-Eulerian approach for modeling wet steam flow, was used. The condensing flow is governed by the compressible Navier-Stokes equations in conjunction with a wet steam multiphase model. The turbulence model selected for this work is Spalart Allmaras model which is based on the Reynolds Averaged Navier Stoke (RANS) model available in FLUENT. Results are then compared with previous researchers that use different methods including user defined code and experiment. The importance of this research study is to determine the accuracy of the software and method used and to compare the results with other researchers.The current work shows good agreement with the experimental data done by Skilling [1] and 2D calculations done by Yusoff et al. [2]. It is found from the numerical simulation results that the supercritical heat addition has caused the flow in the condensing steam to retard and gives rise to pressure oscillations. The unsteady supercritical heat addition reveals promising results indicating the capability of FLUENT to calculate this phenomenon which might cause instability in turbine channel.

AB - This study is mainly to investigate the unsteady flows due to supercritical heat addition in high speed condensing steam in steam turbines. To achieve this, condensation flow characteristic is investigated on 2D converging-diverging nozzle. A Computational Fluid Dynamics (CFD) code (FLUENT package) that adopted the Eulerian-Eulerian approach for modeling wet steam flow, was used. The condensing flow is governed by the compressible Navier-Stokes equations in conjunction with a wet steam multiphase model. The turbulence model selected for this work is Spalart Allmaras model which is based on the Reynolds Averaged Navier Stoke (RANS) model available in FLUENT. Results are then compared with previous researchers that use different methods including user defined code and experiment. The importance of this research study is to determine the accuracy of the software and method used and to compare the results with other researchers.The current work shows good agreement with the experimental data done by Skilling [1] and 2D calculations done by Yusoff et al. [2]. It is found from the numerical simulation results that the supercritical heat addition has caused the flow in the condensing steam to retard and gives rise to pressure oscillations. The unsteady supercritical heat addition reveals promising results indicating the capability of FLUENT to calculate this phenomenon which might cause instability in turbine channel.

UR - http://www.scopus.com/inward/record.url?scp=84944212585&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84944212585&partnerID=8YFLogxK

U2 - 10.11113/jt.v76.5791

DO - 10.11113/jt.v76.5791

M3 - Article

VL - 76

SP - 37

EP - 42

JO - Jurnal Teknologi (Sciences and Engineering)

JF - Jurnal Teknologi (Sciences and Engineering)

SN - 0127-9696

IS - 10

ER -