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

Titel: Development and assessment of volume resolving velocimetry for turbomachinery test facilities
Autor(en): Klinner, Joachim
Schlagworte (SWD): Transsonische StrömungTomografieParticle-Image-VelocimetryLumineszenzdiode
Klassifikation (DDC): 620 - Ingenieurwissenschaften (Engineering and allied operations)
Erscheinungsdatum: 21-Dez-2017
Herausgeber: Deutsches Zentrum für Luft- und Raumfahrt DLR
Zitierform: Forschungsbericht / Deutsches Zentrum für Luft- und Raumfahrt DLR FB
Serie/Report Nr.: DLR-FB-2017-52
Zusammenfassung: 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
Sammlung(en):Dissertationen

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