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High-Speed Particle Image Velocimetry for the Efficient Measurement of Turbulence Statistics

Willert, Christian and Klinner, Joachim (2014) High-Speed Particle Image Velocimetry for the Efficient Measurement of Turbulence Statistics. Diagnostik i.d. Verbrennung, DIV10, 15.-16. Okt. 2014, Stuttgart.

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Abstract

A high frame rate camera and a continuous wave laser are used to capture long particle image sequences exceeding 100,000 consecutive frames at framing frequencies up to 50 kHz. The combination of large image number and high frame rate is possible by restricting the field of view to a narrow strip of 256 pixel width and 1024 pixel height. The electronic shutter of the high-speed CMOS camera is reduced to 10us to prevent excessive particle image streaking. Multi-frame PIV processing algorithms are employed to improve the dynamic range of recovered PIV data. The large number of velocity data permits a reliable estimation of both the mean velocity profile down to a few wall units as well as statistical information such as the near wall Reynolds stress components. The measurement technique is demonstrated on a turbulent channel flow inside a small wind tunnel with Re_delta = 4800 and Re_tau = 240. The continuous velocity data can further be used to extract frequency spectra and probability density functions of the boundary layer flow.

Item URL in elib:https://elib.dlr.de/94591/
Document Type:Conference or Workshop Item (Speech)
Title:High-Speed Particle Image Velocimetry for the Efficient Measurement of Turbulence Statistics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Klinner, Joachimjoachim.klinner (at) dlr.deUNSPECIFIED
Date:October 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:particle image velocimetry, PIV, turbulence statistics, turbulent boundary layer, wall bounded flows, high speed camera, channel flow, PIV processing algorithm, time-resolved PIV
Event Title:Diagnostik i.d. Verbrennung, DIV10
Event Location:Stuttgart
Event Type:Workshop
Event Dates:15.-16. Okt. 2014
Organizer:DLR, Inst. f. Verbrennungstechnik
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
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:15 Jan 2015 15:46
Last Modified:15 Jan 2015 15:46

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