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Thermodynamic model for power generating gas turbines
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Termodynamisk modell för kraftgenerande gasturbiner (Swedish)
Abstract [sv]

Gasturbiner används i en mängd olika sammanhang, från kraftgenerering till flygplansmotorer. Prestandan hos gasturbiner beror på omgivningstillstånd såsom temperatur och tryck. Gasturbintillverkare förser ofta vissa parametrar, exempelvis uteffekt och massflöde i avgaserna vid väldefinierade standard tillstånd, ofta refererade till som ISO-tillstånd. På grund av det tidigare beskrivna beroendet är det nödvändigt för köpare att kunna förutspå prestandan vid platsen där gasturbinen ska användas. 

I denna studie har en termodynamisk modell för kraftgenerande gasturbiner konstruerats. Modellen förutspår uteffekten vid full belastning för varierande omgivningstemperatur och omgivningstryck. Den konstruerade modellen har jämförts med prestandadata från Siemens egna modeller, vid varieande temperatur. Prestandadata för varierande tryck kunde inte erhållas.  

Den konstruerade modellen är konsekvent med Siemens modeller inom vissa temperaturintervall vars längd beror på den utvärderade gasturbinens storlek. För mindre gasturbiner är temperaturintervallet för vilken den konstruerade modellen är konsekvent längre än för större gasturbiner.

Abstract [en]

Gas turbines are used for a variety of purposes ranging from power generation to aircraft engines. Their performance is dependent on ambient conditions such as temperature and pressure. Gas turbine manufacturers often provide certain parameters like power output and exhaust mass flow at well-defined standard conditions, usually referred to as ISO-conditions. Due to the aforementioned dependency, it is necessary for buyers to be able to predict gas turbine performance at their chosen site of operation.

In this study, a thermodynamic model for power generating gas turbines has been constructed. It predicts the power output at full load for varying ambient temperature and pressure. The constructed model has been compared with performance data taken from Siemens own models for varying temperatures. No performance data for varying pressures could be obtained.

The constructed model is consistent with the Siemens models within certain temperature intervals, which differ depending on the size of the gas turbine. For smaller gas turbines, the interval where the constructed model is consistent is greater than for larger gas turbines. 

Place, publisher, year, edition, pages
2015.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-170917OAI: oai:DiVA.org:kth-170917DiVA: diva2:840963
Subject / course
Energy Technology
Educational program
Master of Science in Engineering - Mechanical Engineering
Available from: 2015-07-14 Created: 2015-07-09 Last updated: 2015-07-14Bibliographically approved

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