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Numerical Study of Incidence Angles and Gap Heights in Turbine Cascades and Rotors on Tip Clearance Losses

Buske, Clemens and Ullrich, Wolfram C. and Röhle, Ingo (2013) Numerical Study of Incidence Angles and Gap Heights in Turbine Cascades and Rotors on Tip Clearance Losses. ASME Turbo Expo 2013, 3.-7. Jun 2013, San Antonio, TX, USA. DOI: 10.1115/GT2013-94872 ISBN 978-0-7918-5522-5

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Abstract

The design and optimization of turbines demands the use of fast low-fidelity tools. To obtain adequate results, loss correlations simplifying the complex turbine throughflow are implemented. Accounting for modern turbine designs and flow conditions, revisions of profile and secondary loss correlations were primarily focused upon, while improvements of the tip clearance loss correlations are difficult to achieve. Realistic enginelike conditions concerning variations of the tip clearance, blade loading and solidity are time- and cost-intensive to investigate. This paper is focused on an extensive numerical study, intending to support experiments on tip clearance loss correlations. The losses of a high pressure axial turbine rotor are analyzed for different tip clearance gap heights and incidence angles at cruise condition. The results are contrasted with a cascade having comparable tip profile and gap heights. The cascade’s flow is comparable to the rotor, but with respect to experimental restrictions concerning inlet and outlet conditions. Steady 3D calculations in the stationary and rotating frame were performed applying DLR’s turbomachinery CFD code TRACE using Menter’s SST k-w turbulence model. The tip clearance loss coefficients were extracted from the flow field by post-processing data of an outlet plane and as massflow averaged global values. The findings are discussed referencing previous publications about the leakage flow system and tip clearance loss. Finally, a comparison to results from tip clearance loss correlations of Ainley-Mathieson and Dunham-Came is presented.

Item URL in elib:https://elib.dlr.de/83095/
Document Type:Conference or Workshop Item (Speech)
Title:Numerical Study of Incidence Angles and Gap Heights in Turbine Cascades and Rotors on Tip Clearance Losses
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Buske, ClemensClemens.Buske (at) dlr.dehttps://orcid.org/0000-0003-4157-7415
Ullrich, Wolfram C.Technische Universität MünchenUNSPECIFIED
Röhle, IngoDLR, AT-TURUNSPECIFIED
Date:June 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:6A
DOI :10.1115/GT2013-94872
Page Range:V06AT36A020
ISBN:978-0-7918-5522-5
Status:Published
Keywords:tip clearance losses, turbine, loss correlation, Ainley Mathieson, Dunham Came
Event Title:ASME Turbo Expo 2013
Event Location:San Antonio, TX, USA
Event Type:international Conference
Event Dates:3.-7. Jun 2013
Organizer:ASME
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old), E - Gasturbine (old)
Location: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Deposited By: Buske, Clemens
Deposited On:25 Jun 2013 15:07
Last Modified:20 Jul 2016 16:34

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