DC FieldValueLanguage
dc.contributor.authorBauer, Maximilian-
dc.contributor.authorHummel, Simon-
dc.contributor.authorSchatz, Markus-
dc.contributor.authorKegalj, Martin-
dc.contributor.authorVogt, Damian-
dc.identifier.citationProc. ASME Turbo Expo 2020, GT2020-14310de_DE
dc.description.abstractThe performance of axial diffusers installed downstream of heavy duty gas turbines is mainly affected by the turbine load. Thereby the outflow varies in Mach number, total pressure distribution, swirl and its tip leakage flow in particular. To investigate the performance of a diffuser at different load conditions, a generic diffuser geometry has been designed at ITSM which is representative for current heavy duty gas turbine diffusers. Results are presented for three different operating conditions, each with and without tip flow respectively. Part-load, design-load and over-load operating conditions are defined and varied at the diffuser inlet in terms of Mach number, total pressure distribution and swirl. Each operating point is investigated experimentally and numerically and assessed based on its flow field as well as the pressure recovery. The diffuser performance shows a strong dependency on the inlet swirl and total pressure profile. A superimposed tip flow only influences the flow field significantly when the casing flow is weakened due to casing separation. In those cases pressure recovery increases with additional tip flow. There is a reliable prediction of the CFD simulations at designload. At part-load, CFD overpredicts the strut separation, resulting in an underpredicted overall pressure recovery. At over-load, CFD underpredicts the separation extension in the annular diffuser but overpredicts the hub wake. This leads to a better flow control in CFD with the result of an overpredicted overall pressure recovery.de_DE
dc.description.sponsorshipStrömungsmaschinen in der Energietechnikde_DE
dc.publisherAmerican Society of Mechanical Engineersde_DE
dc.titleInvestigation of the Flow Field and the Pressure Recovery in a Gas Turbine Exhaust Diffuser at Design, Part-Load and Over-Load Conditionde_DE
dc.typeConference Proceedingsde_DE
dc.relation.conferenceASME Turbo Expo: Turbine Technical Conference and Exposition 2020de_DE
dc.contributor.affiliationInstitute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgartde_DE
dc.contributor.affiliationInstitute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgartde_DE
dc.contributor.affiliationHelmut-Schmidt-Universität / Universität der Bundeswehr Hamburg, Laboratory of Fluid Machinery (LSM)de_DE
dc.contributor.affiliationSiemens AGde_DE
dc.contributor.affiliationInstitute of Thermal Turbomachinery and Machinery Laboratory (ITSM), University of Stuttgartde_DE
dcterms.bibliographicCitation.originalpublisherplaceNew Yorkde_DE
dcterms.bibliographicCitation.isPartOfProceedings of the ASME Power Conference - 2020de_DE
item.fulltext_sNo Fulltext-
item.fulltextNo Fulltext-
item.openairetypeConference Proceedings-
crisitem.author.deptStrömungsmaschinen in der Energietechnik-
crisitem.author.parentorgFakultät für Maschinenbau und Bauingenieurwesen-
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