Self-excited oscillations of a high-speed impinging planar jet

Arthurs, David; Ziada, Samir

doi:10.1016/j.jfluidstructs.2012.06.002

Cited by 33 publications

(10 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the excitation frequency is close to the frequency of selfsustained flapping oscillation, the two planar opposed jets exhibit excited deflecting oscillation. This interesting phenomenon may be caused by the resonance between the excitation and self-sustained flapping oscillation, which has also been reported in the jet with excitation (Staubli and Rockwell, 1987;Yoshida et al, 2001;Arthurs and Ziada, 2012). The excited deflecting oscillation is absent in Reactor I, as the results of our recent study show that the deflecting oscillation does not occur in T-jets reactors similar to Reactor I (Tu et al, 2014b).…”

Section: Resultssupporting

confidence: 60%

Experimental study on oscillation behaviors in T-jets reactor with excitation

Qian

et al. 2015

Chemical Engineering Science

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 60%

Experimental study on oscillation behaviors in T-jets reactor with excitation

Qian

et al. 2015

Chemical Engineering Science

View full text Add to dashboard Cite

“…Subsonic impinging planar jets also produce intense tones. However, compared to round jets, the tones are generated for lower flow velocities, as noted by Arthurs & Ziada (2012). Supersonic impinging planar jets have been studied by Krothapalli (1985) by considering rectangular jets of moderate aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Investigation of tone generation in ideally expanded supersonic planar impinging jets using large-eddy simulation

2016

View full text Add to dashboard Cite

The generation of tones in a supersonic planar jet impinging on a flat plate normally has been investigated by performing compressible large-eddy simulations using low-dissipation and low-dispersion finite differences. At the exit of a straight nozzle of height $h$, the jet is ideally expanded, and has a Mach number of 1.28 and a Reynolds number of $5\times 10^{4}$. Four distances between the nozzle and the plate between $3.94h$ and $9.1h$ have been considered. Flow snapshots and mean velocity fields are first presented. The variations of turbulence intensities and of the convection velocity in the jet shear layers are then examined. The properties of the jet near fields are subsequently described, in particular by applying Fourier decomposition to the pressure fields. Several coexisting tones appear to be generated by aeroacoustic feedback loops establishing between the nozzle lip and the flat plate, which also lead to the presence of hydrodynamic–acoustic standing waves. The tone frequencies are consistent with those given by the aeroacoustic feedback model and with measurements for high-aspect-ratio rectangular jets. The jet oscillation modes at these frequencies are characterized, and found to agree with experimental data. Their symmetric or antisymmetric natures are shown to be well predicted by a wave analysis carried out using a vortex sheet model of the jet, providing the allowable frequency ranges for the upstream-propagating acoustic waves. Thus, it is possible, for an ideally expanded impinging planar jet to predict both the frequencies of the tones and the symmetric or antisymmetric nature of the corresponding oscillation modes by combining the aeroacoustic feedback model and the wave analysis.

show abstract

“…However, compared to round jets, tones are visible at lower flow velocities, as noted by Arthurs and Ziada. 9 Planar supersonic jets impinging on a flat plate normally has been studied by Norum 10 and Tam and Norum 11 in the nineties. These authors obtained, for certain jets, acoustic spectra with two emerging tone frequencies.…”

Section: Introductionmentioning

confidence: 99%

Large-eddy simulation of supersonic planar jets impinging on a flat plate at an angle of 60 to 90 degrees

Gojon

Bogey

Marsden

2015

21st AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

Six planar supersonic jets are computed by compressible large-eddy simulations (LES) using low-dissipation schemes. At the exit of a nozzle of height h, they are ideally expanded and have an exit velocity ue, yielding a Mach number of Me = 1.28, and a Reynolds number of Reh = ueh/ν = 5 × 10 4 . Four jets impinging on a flat plate at distances L from the nozzle lips ranging from 3.94h up to 9.1h, with an angle θ between the jet direction and the plate of 90 degrees, are first considered. Two other jets with L = 5.5h and θ = 60 and θ = 75 degrees are also examined. In this way, the effects of both the nozzle-to-plate distance and the angle of impact on the flow and acoustic fields of the jet are studied. Mean velocity flows and snapshots of density, pressure and vorticity are shown. The pressure fields are also described by computing sound pressure levels and using Fourier decomposition. Several tones are obtained in certain cases and their corresponding Strouhal numbers and symmetric or antisymmetric natures are in agreement with experimental data and theoretical models. They are due to an aeroacoustic feedback mechanism occurring between the nozzle lips and the flat plate. This mechanism generates an hydrodynamicacoustic standing wave revealed by using Fourier decomposition.

show abstract

Self-excited oscillations of a high-speed impinging planar jet

Cited by 33 publications

References 33 publications

Experimental study on oscillation behaviors in T-jets reactor with excitation

Experimental study on oscillation behaviors in T-jets reactor with excitation

Investigation of tone generation in ideally expanded supersonic planar impinging jets using large-eddy simulation

Large-eddy simulation of supersonic planar jets impinging on a flat plate at an angle of 60 to 90 degrees

Contact Info

Product

Resources

About