Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Jaunet, Vincent"'
Autor:
Jaunet, Vincent, Lehnasch, Guillaume
This article delves into the dynamics of inviscid annular supersonic jets, akin to those exiting converging-diverging nozzles in over-expanded regimes. It focuses on the first azimuthal Fourier mode of flow fluctuations and examines their behavior wi
Externí odkaz:
http://arxiv.org/abs/2406.00677
This work proposes a methodology to improve the extraction of coherent structures associated with the generation of acoustic fluctuations in turbulent jets from high-speed Schlieren images. This methodology employs the momentum potential theory of Do
Externí odkaz:
http://arxiv.org/abs/2312.09054
Autor:
Mancinelli, Matteo, Martini, Eduardo, Jaunet, Vincent, Jordan, Peter, Towne, Aaron, Gervais, Yves
Screech tones in supersonic jets are underpinned by resonance between downstream-travelling Kelvin-Helmholtz waves and upstream-travelling acoustic waves. Specifically, recent work suggests that the relevant acoustic waves are guided within the jet a
Externí odkaz:
http://arxiv.org/abs/2109.14988
Autor:
Nogueira, Petrônio A. S., Jaunet, Vincent, Mancinelli, Matteo, Jordan, Peter, Edgington-Mitchell, Daniel
This paper explores the screech closure mechanism for different axisymmetric modes in shock-containing jets. While many of the discontinuities in tonal frequency exhibited by screeching jets can be associated with a change in the azimuthal mode, ther
Externí odkaz:
http://arxiv.org/abs/2107.06429
Autor:
Nogueira, Petrônio A. S., Jordan, Peter, Jaunet, Vincent, Cavalieri, André V. G., Towne, Aaron, Edgington-Mitchell, Daniel
We present an analysis of the linear stability characteristics of shock-containing jets. The flow is linearised around a spatially periodic mean, which acts as a surrogate for a mean flow with a shock-cell structure, leading to a set of partial diffe
Externí odkaz:
http://arxiv.org/abs/2106.12690
Publikováno v:
The Journal of the Acoustical Society of America 151, 852 (2022)
Vortex-sheet models of jets are widely used to describe the dynamics of modes, such as the Kelvin-Helmholtz instability and guided acoustic waves. However, it is seldom pointed out in the literature the absence of the free-stream acoustic modes in th
Externí odkaz:
http://arxiv.org/abs/2106.11226
Publikováno v:
Journal of Fluid Mechanics, Volume 928, 10 December 2021, A32
We model the resonance mechanism underpinning generation of A1 and A2 screech tones in an under-expanded supersonic jet. Starting from the resonance model recently proposed by \cite{mancinelli2019screech}, where the upstream-travelling wave is a neut
Externí odkaz:
http://arxiv.org/abs/2012.01342
Autor:
Edgington-Mitchell, Daniel, Wang, Tianye, Nogueira, Petronio, Schmidt, Oliver, Jaunet, Vincent, Duke, Daniel, Jordan, Peter, Towne, Aaron
Publikováno v:
J. Fluid Mech. 913 (2021) A7
The interaction between various wavelike structures in screeching jets is considered via both experimental measurements and linear stability theory. Velocity snapshots of screeching jets are used to produce a reduced order model of the screech cycle
Externí odkaz:
http://arxiv.org/abs/2008.09756
Autor:
Bakulu, Florian, Lehnasch, Guillaume, Jaunet, Vincent, da Silva, Eric Goncalves, Girard, Steve
An overexpanded jet in a truncated ideally contoured nozzle is found to feature a tonal behavior. The flow field is investigated to understand its origin and show how it modifies side-load properties. The temporal and spatial organization of wall pre
Externí odkaz:
http://arxiv.org/abs/2007.04704
Publikováno v:
Phys. Rev. Fluids 4, 063901 (2019)
Coherent turbulent wave-packet structures in a jet at Reynolds number 460000 and Mach number 0.4 are extracted from experimental measurements and are modeled as linear fluctuations around the mean flow. The linear model is based on harmonic optimal f
Externí odkaz:
http://arxiv.org/abs/1810.09340