Print Email Facebook Twitter Jet pressure-spectra estimation from single-snapshot tomographic PIV Title Jet pressure-spectra estimation from single-snapshot tomographic PIV Author González, G. (Student TU Delft) Ragni, D. (TU Delft Wind Energy) Avallone, F. (TU Delft Wind Energy) Schneiders, J.F.G. (TU Delft Aerodynamics) Casalino, D. (TU Delft Wind Energy) Ianiro, A. (TU Delft Aerodynamics; Carlos III University of Madrid) Date 2018 Abstract The analysis of the unsteady flow field of an axisymmetric subsonic jet at Reynolds numbers between 5,000 and 20,000 and computation of its unsteady pressure field is carried out from single snapshots of tomographic PIV measurements (acquisition rate 0.8 Hz). This is achieved by a recently developed pressure-evaluation technique based upon the vortex-in-cell (VIC) methodology. The technique allows for a finite time-marching of the instantaneous 3D velocity fields obtained from low-repetition PIV systems. A time series of velocity fields in 3D is obtained, which is integrated into unsteady pressure by use of the Navier-Stokes momentum equation. Despite the limitations in the finite-time marching of the measured structures due to the size of the acquired tomographic volume, spectra of pressure fluctuations can be extracted in a frequency range between 800Hz and 20kHz. Fair agreement was found between the experimentally computed pressure spectra and the respective values found in literature. Further work is dedicated to exploit the full potential of the technique by attempting a sound pressure level integration of the noise sources from the unsteady fields. To reference this document use: http://resolver.tudelft.nl/uuid:a6396836-2b1a-4bb5-96c8-723a04604f02 DOI https://doi.org/10.2514/6.2018-3293 Publisher American Institute of Aeronautics and Astronautics Inc. (AIAA) Embargo date 2019-01-01 ISBN 9781624105609 Source 2018 AIAA/CEAS Aeroacoustics Conference Event AIAA/CEAS Aeroacoustics Conference, 2018, 2018-06-25 → 2018-06-29, Atlanta, United States Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type conference paper Rights © 2018 G. González, D. Ragni, F. Avallone, J.F.G. Schneiders, D. Casalino, A. Ianiro Files PDF 6.2018_3293.pdf 1.96 MB Close viewer /islandora/object/uuid:a6396836-2b1a-4bb5-96c8-723a04604f02/datastream/OBJ/view