WebApr 12, 2024 · Fig. 4. (Color online) System of two transverse vortices at { {\kappa }^ {2}} = 2. The positive and negative vortices are oriented along the y axis and their cores differ in the amount of the trapped second component. The longitudinal section of the beam by the x = 0 plane at ζ = (a) 291 and (b) 300. Full size image. WebJan 12, 2024 · The fast Fourier transform of the sampled velocity and pressure signals indicates a precessing vortex core with a frequency of 22 Hz. This frequency is in line with the one detected by spectral proper orthogonal decomposition, which is utilized to identify the coherent structures in the near-field region of the swirling flow in the present work.
Impact of the Precessing Vortex Core on NOx Emissions in …
WebThe precessing vortex core (PVC) is a coherent structure that can arise in swirling jets from a global instability. In this work, the PVC is investigated under highly turbulent conditions. The goal is to characterize the receptivity of the PVC to active flow control, both theoretically and experimentally. WebJan 13, 2024 · This flow is characterized by phenomena such as vortex transition, precessing vortex core, toroidal recirculation zone, reverse flow core and recirculation zone in the axial… Show more skylar frosted cherry
Aditya Pandare - Scientist - Los Alamos National Laboratory
WebNov 17, 2024 · A precessing vortex core (PVC) is a self-excited helical instability that results from the precession of the vortex core around the flow axis in the upstream region of a vortex breakdown bubble. PVC oscillation in a swirl flow-based combustor aids the thermoacoustic instability that results in hardware damage and poor emission … WebDec 31, 2006 · It is known that precessing vortex core (PVC) formation is related to unsteady CRZ motion. 1, 56 Moreover, in unidirectional swirling flows, the CRZ moves coherently with PVC and rotates with the ... WebMay 31, 2024 · We report on the experimental study of a precessing vortex core (PVC) in an air model of a Francis turbine. The focus is placed on the modal decomposition of the PVC that occurs in the draft tube of the model turbine for a range of operation conditions. swearing bus driver