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An investigation of the influence of the size distribution of seeding particles on LDA velocity data in the vicinity of a large velocity gradient

Thomas, P.J. and Bütefisch, K.-A. (1993) An investigation of the influence of the size distribution of seeding particles on LDA velocity data in the vicinity of a large velocity gradient. Phys. Fluids A 5 (11), November 1993, pp. 2807-2814. Americal Institute of Physics.

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Abstract

The influence of the properties of the size distribution of seeding particles on the results of laser Doppler anemometry (LDA) velocity measurements in the vicinity of a large velocity gradient downstream of an aerodynamic shock is studied numerically. Accounting for the differing velocity lag of particles of different sizes the average velocity and the pertaining rms values are determined in the relaxation region within which the particles adjust towards the changed flow velocity downstream of theshock. It is shown how the average velocity and the rms value depend on the mean particle size and the density of the particle material. It is demonstrated in a numerical simulation how the LDA system's "amplituede limit", which can offer a means of excluding the contribution of large particles towards the experimental results, affects the average velocity and the rms value to be measured in the relaxation region. A good qualitative agreement of the numerical and the experimental results is found.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1995, pages=7,
Title:An investigation of the influence of the size distribution of seeding particles on LDA velocity data in the vicinity of a large velocity gradient
Authors:
AuthorsInstitution or Email of Authors
Thomas, P.J.UNSPECIFIED
Bütefisch, K.-A.UNSPECIFIED
Date:1993
Journal or Publication Title:Phys. Fluids A 5 (11), November 1993
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 2807-2814
Publisher:Americal Institute of Physics
Series Name:11/93
Status:Published
Keywords:seeding particles, LDA, velocity lag, oblique shock
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L SI - Versuchs- und Simulationstechniken
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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