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Please use this identifier to cite or link to this item: http://nbn-resolving.de/urn:nbn:de:hebis:34-2018010954161

Title: Development and assessment of volume resolving velocimetry for turbomachinery test facilities
Authors: Klinner, Joachim
???metadata.dc.subject.swd???: Transsonische StrömungTomografieParticle-Image-VelocimetryLumineszenzdiode
???metadata.dc.subject.ddc???: 620 - Ingenieurwissenschaften (Engineering and allied operations)
Issue Date: 21-Dec-2017
Publisher: Deutsches Zentrum für Luft- und Raumfahrt DLR
Citation: Forschungsbericht / Deutsches Zentrum für Luft- und Raumfahrt DLR FB
Series/Report no.: DLR-FB-2017-52
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 signi cantly 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.
URI: urn:nbn:de:hebis:34-2018010954161
ISSN: 1434-8454
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