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Evaluation of CFD Methods for Prediction of Total Temperature and Total Pressure Distribution in Gas Turbines
KTH, School of Industrial Engineering and Management (ITM).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis work was performed as a collaboration between the Royal Institute of Technology in Stockholm and Siemens Industrial Turbomachinery in Finspång. It was undertaken with the purpose of investigating the use of CFD methods in ANSYS CFX to predict flow mixing in gas turbines.

The results were evaluated against experimental data gathered as part of an international collaboration; The FACTOR project. The experimental data investigated were total temperature and total pressure at nozzle guide vane inlet and outlet.

The results thus focus mainly on nozzle guide vane inlet and outlet due to the nature of the available experimental data.

The distribution of these parameters was also investigated in the NGV flow channel and on the vane surface, but it is appreciated that any conclusions drawn from these results are speculative in nature due to the lack of experimental data. Any conclusions drawn must be placed in perspective of the evaluation of NGV inlet and outlet, for which experimental data is available.

The focus was on the mixing of the total temperature and total pressure in a nozzle guide vane connected to a combustion chamber simulator.

The methods investigated were RANS-SST, SBES and LES-WALE. The main conclusions are that the inclusion of a combustion chamber mesh and thus simulating the CC flow increases the accuracy of the nozzle guide vane results for RANS-SST simulations. It is also observed that in general the SBES and LES-WALE method yield highly similar results under the investigated circumstances, and that both these methods show a general improvement over the RANS-SST method.

Abstract [sv]

Detta examensarbete utfördes som ett samarbete mellan KTH i stockholm och Siemen Industrial Turbomachinery i Finspång. Det undertogs med syftet att undersöka användning av CFD-metoder i ANSYS CFX för att förutspå flödesmixning i gasturbiner.

Resultaten utvärderades mot experimentel data som samlats genom ett internationellt samarbete: FACTORprojektet. Den experimentella data som undersökts var totaltemperatur och totaltryck vid in- och utloppet till ett statorblad.

Resultaten fokuserar huvudsakligen vid in- och utlopp till statorbladed på grund av den tillgängliga experimentella datan. Distributionen av totaltemperatur och totaltryck mellan dessa plan undersöktes också, men det måste lyftas att alla slutsatser som dras av dessa resultat är till någon grad spekulativ på grund av tillgängliga datans natur. Alla slutsatser som dras härutav måste utvärderas i samband med den tillgängliga datan.

Det huvudsakliga focuser låg vid mixningen av totaltemperature och totaltryck i ett statorbland anslutet till en brännkammarsimulator. De undersöka metoderna var RANS-SST, SBES och LES-WALE.

De huvudsakliga slutsatserna är att inkluderandet av en brännkammar-mesh och därmed simuleringen av brännkammarflödet förbättrar kvaliten på resultatet för statorbladen för RANS-SST simuleringar. Det har också framkommit att SBES och LES-WALE-metoderna resulterar i högst likvärda resultat i de undersökta omständigheterna, och att båda dessa metoder ger ett generellt förbättrat resultat vid jämförelse med RANSSST.

Place, publisher, year, edition, pages
2019. , p. 59
Series
TRITA-ITM-EX ; 2019:439
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-264356OAI: oai:DiVA.org:kth-264356DiVA, id: diva2:1373065
External cooperation
Siemens Industrial Turbomachinery AB
Supervisors
Examiners
Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2019-11-26Bibliographically approved

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