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NUMERICAL INVESTIGATION OF THE ORIGIN OF LOSSES IN THE ROTOR HUB REGION OF A MULTISTAGE AXIAL COMPRESSOR

Herve, Simon and Reutter, Oliver and Wieler, Mark and Nicke, Eberhard (2013) NUMERICAL INVESTIGATION OF THE ORIGIN OF LOSSES IN THE ROTOR HUB REGION OF A MULTISTAGE AXIAL COMPRESSOR. In: ASME Turbo Expo 2013. ASME Turbo Expo 2013, 3.-7. Juni 2013, San Antonio, USA.

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Abstract

Endwall losses and secondary air flow are considered to be responsible for a significant part of the flow losses in compressors. Their reduction can be achieved by 3D blade design and non-axisymmetric endwalls. In order to evaluate the potential of both effects, an analysis of secondary air flow and the origin of losses is realized. This paper presents multiple numerical simulations to determine the predominant phenomena at the origin of losses in the hub region of the last rotor of the Rig 250, a 4-stage compressor with cantilevered stators and rotor tip clearances. In a first study (I), an inviscid endwall condition at the hub of rotor 4 has been investigated. This condition strongly reduces the secondary air flow from the pressure side to the suction side and shows a significant reduction of the losses in the hub region. But the typical loss distribution over the blade height with a local maximum between 5 and 15%of the blade height is not changed. Through this study the losses generated by the endwall boundary layer and the resulting secondary air flow are evaluated. Moreover, the potential for endwall contouring and 3D blading in the hub region is estimated, which can be used in future design studies. In the second study (II), ideal radial distributions of the velocity and of the inflow angles at the inlet of the rotor 4 are set. The results show the dependencies between the inflow condition and the loss production in the blade passage near the endwall. These studies sets the theoretical maximal potential for improvement techniques, like endwall contouring or the modification of the upstream stator.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:NUMERICAL INVESTIGATION OF THE ORIGIN OF LOSSES IN THE ROTOR HUB REGION OF A MULTISTAGE AXIAL COMPRESSOR
Authors:
AuthorsInstitution or Email of Authors
Herve, Simonsimon.herve@dlr.de
Reutter, Oliveroliver.reutter@dlr.de
Wieler, MarkAT-FUV
Nicke, Eberhardeberhard.nicke@dlr.de
Date:6 June 2013
Journal or Publication Title:ASME Turbo Expo 2013
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:endwall contouring, compressor, CFD, computational fluid dynamics, rotor, optimization
Event Title:ASME Turbo Expo 2013
Event Location:San Antonio, USA
Event Type:international Conference
Event Dates:3.-7. Juni 2013
Organizer:ASME
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Oliver Reutter
Deposited On:20 Jun 2013 09:37
Last Modified:12 Dec 2013 22:06

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