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Vortex Chararcteristics Analysed from HART Data

van der Wall, Berend G. (1997) Vortex Chararcteristics Analysed from HART Data. 23rd European Rotorcraft Forum, 1997-09-16 - 1997-09-18, Dresden, Germany.

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Abstract

This paper analyses the detailed data taken during the HART test 1994 on a pressure instrumented BO105 hingeless model rotor. Leading edge pressure distribution provides information, over which part of the rotor disk vortices passed on top, where they penetrate the disk and where they are below. The intensity of BVI is qualitatively visible. From pressure distribution along chord in the outer part of the blade, the load distribution and therewith the blade bound circulation can be computed. This results into the strength, sense of rotation, the number and the radial position of tip vortices trailed into the wake. Flow visualisation by LLS technique provides the vortex trajectories in space at a desired blade azimuth and the vortex passage height and time through the LDV measurement range, and its inclination angles with respect to the LDV position, can be derived from these data. 3D velocity vectors within a wide time window are available by LDV measurements along two vertical lines. These data provide information about the vortex structure, i.e. vorticity distribution, vector field, core radius, circulation, height and time of passage of the vortex center through the LDV measurement range. All of these data are used in this paper to analyse the vortex structures, to compare LLS and LDV results where possible and to point on noncompatibilities found between the results.

Item URL in elib:https://elib.dlr.de/20326/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Vortex Chararcteristics Analysed from HART Data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
van der Wall, Berend G.UNSPECIFIEDUNSPECIFIED
Date:September 1997
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:HART, LDV, flow field analysis, rotor blade tip vortex
Event Title:23rd European Rotorcraft Forum
Event Location:Dresden, Germany
Event Type:international Conference
Event Dates:1997-09-16 - 1997-09-18
Organizer:DGLR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Active Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: van der Wall, Prof. Dr. Berend G.
Deposited On:15 Dec 2005
Last Modified:27 Apr 2009 04:45

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