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Development and assessment of volume resolving velocimetry for turbomachinery test facilities

Klinner, Joachim (2017) Development and assessment of volume resolving velocimetry for turbomachinery test facilities. Dissertation. DLR-Forschungsbericht. DLR-FB-2017-52, 194 S.

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Official URL: http://nbn-resolving.de/urn:nbn:de:hebis:34-2018010954161

Abstract

The present thesis assesses the applicability of volume resolving velocimetry for turbo machinery test facilities. Tomographic particle image velocimetry has been implemented in a transonic cascade wind tunnel. Assessment is based on 3D-3C measurements of the passage vortex in an axial compressor cascade at subsonic inflow (Ma1=0.6). Results show broad consistency with stereoscopic PIV with improved depth resolution. A novel Fast Multiplicative Algebraic Reconstruction Technique (FMART) enables signicantly faster computations of particle reconstructions in comparison to a state-of-the-art procedure (simultaneous MART) while maintaining similar accuracies. The second part describes the development of tomographic shadowgraphy for 3-D measurements of spatial fuel spray distributions and droplet velocities. This novel approach is based on simultaneous imaging from different directions with pulsed LED inline illumination. Assessment is based on 3D-3C measurements of the airblast atomization of a single kerosene jet in a swirl flow at air pressures between 4-7 bar and air temperatures between 440-570 K inside a spray test facility. The minimum resolvable droplet diameter is 10 µm under the given experimental conditions. Validation against PDA data revealed consistency at size classes d = 10µm and 15µm.

Item URL in elib:https://elib.dlr.de/117111/
Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Development and assessment of volume resolving velocimetry for turbomachinery test facilities
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klinner, JoachimJoachim.Klinner (at) dlr.dehttps://orcid.org/0000-0003-2709-9664
Date:21 December 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:194
Series Name:DLR Forschungsbericht
ISSN:1434-8454
Status:Published
Keywords:transonic flow, tomographic reconstruction, PIV, pulsed LED, shadowgraphy, sprays, airblast atomization, swirled flow
Institution:University of Kassel
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 - Combustion Chamber Technologies, L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Deposited By: Klinner, Joachim
Deposited On:10 Jan 2018 15:12
Last Modified:31 Jul 2019 20:14

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