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Experimental investigation of the transonic flow around the leading edge of an eroded fan airfoil

Klinner, Joachim and Hergt, Alexander and Willert, Christian (2014) Experimental investigation of the transonic flow around the leading edge of an eroded fan airfoil. Experiments in Fluids, 55 (9), p. 1800. Springer. doi: 10.1007/s00348-014-1800-y. ISSN 0723-4864.

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Official URL: http://link.springer.com/article/10.1007%2Fs00348-014-1800-y#


The influence of leading edge modification on the time-averaged and instantaneous flow around a fan airfoil is investigated by particle image velocimetry (PIV), schlieren imaging and high-speed shock shadowgraphs in a transonic cascade windtunnel. In addition to a global characterization of the time-averaged flow using PIV, the instantaneous passage shock position was extracted from single-shot PIV measurements by matching the tracer velocity across the normal shock with an exponential fit. The instantaneous shock positions are assigned to a probability density distribution in order to obtain the average position and the range of fluctuations of the eroded and reference leading edge. The profiles are used to estimate the response time of the particles to the normal shock which was found to be in the sub-microsecond range. Averaged PIV measurements and the probability density of shock position from both geometries are obtained at near stall and choked conditions. In order to extract the frequency range of the shock motion, the shadow of the shock wave was tracked using high-speed shadowgraphy. The paper also provides details on the experimental implementation such as a specifically designed light-sheet probe.

Item URL in elib:https://elib.dlr.de/90532/
Document Type:Article
Title:Experimental investigation of the transonic flow around the leading edge of an eroded fan airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Klinner, Joachimjoachim.klinner (at) dlr.deUNSPECIFIED
Hergt, Alexanderalexander.hergt (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:24 August 2014
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s00348-014-1800-y
Page Range:p. 1800
Keywords:turbomachine, blade erosion, particle response, transonic flow, shock unsteadiness, shock oscillation, light sheet probe, PIV
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 - Virtual Engine and Validation methods (old), L - Fan and Compressor Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Klinner, Dr.-Ing. Joachim
Deposited On:24 Nov 2014 09:47
Last Modified:06 Sep 2019 15:25

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