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Strut Design for an Extended Operating Range of Industrial Gas Turbine Exhaust Diffusers

Zurmühlen, Christian (2021) Strut Design for an Extended Operating Range of Industrial Gas Turbine Exhaust Diffusers. DLR-Forschungsbericht. DLR-FB-2021-13. Dissertation. TU Braunschweig. 161 S.

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Abstract

One of the main requirements for modern gas turbines (GTs) is load-flexible operation at both high efficiencies and low emission rates. Typically, older GT generations are not designed for such operating conditions, which is why their efficiency often drops sharply at off-design condition. Hence, a modernization of the individual GT components is crucial. This work contributes by strut design for an extended operating range of industrial gas turbine exhaust diffusers. Obstacles within the diffuser system, so-called support struts, have been identified as a key factor to the improvement of overall diffuser efficiency. By their interaction with the turbine s load-dependent exit flow profiles, they define the shape of the diffuser performance map and thus the overall efficiency. Geometric variations, such as staggering, sweep, dihedral and discharge boreholes, were investigated with regard to their influence on the diffuser performance characteristics from low partial to high overload condition. Performance maps for 29 different diffuser configurations, incorporating 20 different strut designs, result from this work. The numerical results are supported by experimental validation.

Item URL in elib:https://elib.dlr.de/147192/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Strut Design for an Extended Operating Range of Industrial Gas Turbine Exhaust Diffusers
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zurmühlen, ChristianChristian.Zurmuehlen (at) dlr.dehttps://orcid.org/0000-0003-1503-7175
Date:June 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:161
ISSN:1434-8454
Status:Published
Keywords:diffuser, strut design, stagger, sweep, lean, taper, dihedral, discharge bore holes, gas turbine, performance map, load flexibility, wind tunnel, Diffusor, Strebengeometrie, Staffelung, Pfeilung, V-Stellung, Entlastungsbohrung, Gasturbine, Betriebskennfeld, Lastflexibilität, Windkanal, RGG, TRACE
Institution:TU Braunschweig
Department:Fachbereich Maschinenbau
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Gas Turbine, L - Components and Emissions
Location: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Deposited By: Zurmühlen, Christian
Deposited On:10 Dec 2021 14:31
Last Modified:10 Dec 2021 14:31

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