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COMBINATION OF ACTIVE AND PASSIVE FLOW CONTROL IN A HIGH SPEED COMPRESSOR CASCADE

Liesner, Karsten and Meyer, Robert (2014) COMBINATION OF ACTIVE AND PASSIVE FLOW CONTROL IN A HIGH SPEED COMPRESSOR CASCADE. In: Proceedings of the ASME Turbo Expo 2014. Proceedings of the ASME Turbo Expo 2014, 16.-20. Juni 2014, Düsseldorf, Germany.

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Abstract

An experimental study is presented in which passive and active flow control are combined in a way that they complement and support one other. Secondary flow control using boundary layer fences is combined with a boundary layer suction in a compressor cascade at high Mach numbers. Inflow Mach number of 0.67 and Reynolds number (based on chord length) of 560.000 assure realistic conditions. The cascade, equipped with five stator vanes of NACA65 K48 type is used in an ambient condition measurement environment. Pressure measurements form the basis of the experimental investigations, flow visualization is used to obtain insight into the topology of the flow field.\\ The boundary layer fences installed on the suction side of the vanes create a region of low-loss two dimensional flow in the center of the passage. A region of high flow loss is generated at the side wall between wall and BL fence. This region is treated with through-wall boundary layer suction as used in previous investigations. This helps stabilize the flow near the wall and prevent large separated areas. The total pressure loss is reduced remarkably and the outflow becomes more two-dimensional compared to the reference measurement and even compared to the measurement with suction applied without BL fences. The application of boundary layer fences on flow-suction experiments allows obtaining the same loss reduction gains by using lower amounts of suction.

Item URL in elib:https://elib.dlr.de/94516/
Document Type:Conference or Workshop Item (Speech)
Title:COMBINATION OF ACTIVE AND PASSIVE FLOW CONTROL IN A HIGH SPEED COMPRESSOR CASCADE
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Liesner, Karstenkarsten.liesner (at) dlr.deUNSPECIFIED
Meyer, RobertAT-TRAUNSPECIFIED
Date:June 2014
Journal or Publication Title:Proceedings of the ASME Turbo Expo 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:compressor cascade, secondary flow, flow suction, boundary layer suction, flow control, active flow control
Event Title:Proceedings of the ASME Turbo Expo 2014
Event Location:Düsseldorf, Germany
Event Type:international Conference
Event Dates:16.-20. Juni 2014
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: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Liesner, Karsten
Deposited On:15 Jan 2015 15:53
Last Modified:23 Feb 2015 10:46

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