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3D Lagrangian particle tracking of a transonic jet using four-pulse Shake-The-Box

Manovski, Peter and Novara, Matteo and Schanz, Daniel and Geisler, Reinhard and Mohan, Nagendra Karthik Depuru and Schröder, Andreas (2017) 3D Lagrangian particle tracking of a transonic jet using four-pulse Shake-The-Box. 12th International Symposium on Particle Image Velocimetery, 18.-22. Juni 2017, Busan, Korea.

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Official URL: http://ispiv2017.org/

Abstract

Three-dimensional Lagrangian Particle Tracking (LPT) was performed on a transonic jet flow in air at Mach 0.84 generated by a round and chevron nozzle with an inner diameter (DDjj) of 15 mmmm. The Shake­The-Box (STB) technique for multi-pulse data was employed to reconstruct particle tracks along the 4-pulse sequences and provided highly resolved accurate flow velocity and material acceleration data. The study of transonic jets has a long history both in the fields of fluid mechanics and aeroacoustics. To date there have only been a limited number of studies investigating these flow phenomena with volumetric measurement techniques. STB for time resolved applications (typically for flow speeds in air less than 30 m/s) is described in [S] and allows for accurate particle tracking of densely seeded (>O.OSppp) flows. Novara et al [3] showed that a short time sequence (or multi-pulse) implementation of STB was able to retrieve most particle tracks with dynamic velocity and acceleration ranges comparable to those obtained with STB in the time-resolved domain, and they stipulated the possibilities of measuring the material acceleration (and pressure) for high speed flows by means of multi-pulse acquisition systems. This experimental investigation shall serve to provide further validation and assessment in real experimental conditions. A multi-pulse setup with a combination of two dual-frarneacquisition systems was used to record tracer particle images of DEHS droplets (-1 µmm diameter) within a volume of 90x70x10 mmmm3 along the jet axial (xx) and two radial directions (yy) and (zz), respectively. The multi-pulse strategy described by (4] is applied here, where the use of two different states of polarization for the illumination sources is used to separate the pulses on the camera images [2]. The two imaging systems consisted each of four sCMOS PCO-Edge cameras and the digital resolution was -33.6 ppp /mmmm. An uneven pulse separation is employed to increase the velocity and acceleration dynamic ranges of the measurement. This allowed a maximum total particle shift of up to 100 px tobe measured. The seeding concentration for the experiment ranged from 0.02 to 0.05 pppppp. For each measurement configuration, a total of 40,000 4-pulse sequences were recorded at a sampling frequency of 10 H H H . The multi-pulse STB technique relies on the Iterative Particle Reconstruction technique (IPR, [6]) to reconstruct particle positions in a volume over a few recordings (typically four) and employs an iterative STB processing strategy to compensate for the lack of a long observation time [4].

Item URL in elib:https://elib.dlr.de/118516/
Document Type:Conference or Workshop Item (Speech)
Additional Information:USB-Stick of Abstracts; ISPIV-130
Title:3D Lagrangian particle tracking of a transonic jet using four-pulse Shake-The-Box
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Manovski, PeterAerospace Division, Defence Science and Technology Group, Melbourne, AustraliaUNSPECIFIED
Novara, Matteomatteo.novara (at) dlr.deUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Geisler, ReinhardReinhard.Geisler (at) dlr.deUNSPECIFIED
Mohan, Nagendra Karthik DepuruUniversity of Cambridge, Cambridge, United KingdomUNSPECIFIED
Schröder, AndreasAndreas.Schroeder (at) dlr.deUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Three-dimensional Lagrangian Particle Tracking (LPT), Shake-The-Box (STB)
Event Title:12th International Symposium on Particle Image Velocimetery
Event Location:Busan, Korea
Event Type:international Conference
Event Dates:18.-22. Juni 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Bachmann, Barbara
Deposited On:26 Jan 2018 12:15
Last Modified:26 Jan 2018 12:15

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