Print Email Facebook Twitter Jet noise predictions by time marching of single-snapshot tomographic PIV fields Title Jet noise predictions by time marching of single-snapshot tomographic PIV fields Author Ragni, D. (TU Delft Wind Energy) Fiscaletti, D. (TU Delft Wind Energy) Baars, W.J. (TU Delft Aerodynamics) Date 2022 Abstract Abstract: This work combines the latest advancements in time marching of 3D vector fields from tomographic particle image velocimetry, with an adapted version of Lighthill’s formulation, for the prediction of far-field jet noise. Three-dimensional velocity vector fields of the jet flow are first reconstructed from a tomographic volume of 4× 3× 9.5 Dj3, with Dj = 5 cm being the jet-exit diameter. (The jet-exit Mach number Mj ranges from 0.10 to 0.20.) The obtained vector fields are then used as input to a recently developed procedure for the time marching of the vorticity field, which relies upon the vortex-in-cell methodology. This yields time series of each three-dimensional velocity field, from which the far-field pressure is computed via Lilley’s acoustic analogy (through evaluation of the Lighthill’s stress tensor). It is shown that the estimate of the far-field noise spectrum compares well with the spectrum measured directly from a far-field microphone in the anechoic A-tunnel facility of TU Delft, in the Strouhal number range from approximately 1 to 12. Graphical Abstract: [Figure not available: see fulltext.] To reference this document use: http://resolver.tudelft.nl/uuid:37c68941-1ca7-4de3-b5d9-d67e408cab11 DOI https://doi.org/10.1007/s00348-022-03436-3 ISSN 0723-4864 Source Experiments in Fluids: experimental methods and their applications to fluid flow, 63 (5) Part of collection Institutional Repository Document type journal article Rights © 2022 D. Ragni, D. Fiscaletti, W.J. Baars Files PDF Ragni2022_Article_JetNois ... eMarch.pdf 4.41 MB Close viewer /islandora/object/uuid:37c68941-1ca7-4de3-b5d9-d67e408cab11/datastream/OBJ/view