Effect of impinging plate geometry on the self-excitation of subsonic impinging jets

Vinoth, B. R.; Rathakrishnan, E.

doi:10.1016/j.jfluidstructs.2011.05.006

Cited by 13 publications

(12 citation statements)

References 18 publications

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“…It is observed that all the pressure fluctuations of the wave are almost entirely confined inside the jet except the waves whose phase speed C is close to -1. The results are consistent with the results of Tam and Ahuja (1) and Vinoth and Rathakrishnan (11) . The wavenumber-frequency relationships of axisymmetric mode (n = 0) and helical (n = 1) neutral waves of the first five modes (m = 1 − 5) for M j = 1.0 are shown in Fig.…”

Section: Dispersion Relation Of Neutral Wavessupporting

confidence: 92%

“…Most of the reported experimental results of impinging tones are for axisymmetric jets and flat plat (1), (5), (11) . On the other side, most of the reported experimental results of edgetones are for two-dimensional jets and wedge-shaped edge (10), (12) .…”

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

“…This range of C values implies that all the neutral acoustic mode instability waves for the subsonic impinging jet travel upstream. The solution method proposed by Vinoth and Rathakrishnan (11) is employed to find the roots.…”

Section: Dispersion Relation Of Neutral Wavesmentioning

confidence: 99%

“…For a stable feedback loop of edge-tone, the neutral wave dispersion must be minimum. This means that the feedback loop is tuned to a frequency range near that of the least dispersive neutral acoustic wave (1), (5), (11) . Thus to calculate the average Strouhal number of a particular mode of the edge-tone, it is necessary to find the Strouhal number of the least dispersive neutral acoustic wave of that mode.…”

Section: Prediction Of Average Strouhal Numbermentioning

confidence: 99%

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Experimental and Theoretical Investigations of Edge Tones in High Speed Jets

Ibrahim

2013

JFST

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Experimental and theoretical investigations of the high speed jets impinge on a wedgeshaped edge have been conducted. Sonic circular and square jets of the same hydraulic diameter are examined in the present study. Edge-tones produced due to a wedgeshaped edge having different angles, specifically, 10 o , 20 o , 60 o and 180 o , have been investigated. Experiments reveal that several instability modes exist simultaneously in the microphone-captured acoustic signal. The minimum breadth is defined as the minimum distance of the edge from the nozzle exist for the first tone to be generated. Experiments showed that at small edge angle, the minimum breadth is approximately half of its equivalent two-dimension case. Semi-empirical frequency formula for the dominant tone is proposed based on the present experimental data for small edge angles. The theoretical results based on the vortex-sheet model proposed by Tam and Ahuja (1) showed that both helical and axisymmetric stability modes exist during jet impingement. The dominant tone usually has helical stability mode which is the well known edge-tone. Other tones are known as impinging-tones in the literatures and have axisymmetric stability modes. Finally, it has been shown that the experimentally obtained mean Strouhal numbers for helical and axisymmetric modes show good agreement with the Strouhal number of the least dispersive wave of the same mode calculated at various Mach numbers.

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Section: Dispersion Relation Of Neutral Wavessupporting

confidence: 92%

Section: Journal Of Fluid Science and Technologymentioning

confidence: 99%

Section: Dispersion Relation Of Neutral Wavesmentioning

confidence: 99%

Section: Prediction Of Average Strouhal Numbermentioning

confidence: 99%

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Experimental and Theoretical Investigations of Edge Tones in High Speed Jets

Ibrahim

2013

JFST

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“…However, with respect to self-excited jet, Vinoth and Rathakrishnan 21 have pointed out that the geometry of impinging plate affects the feedback path of the upstream propagating acoustic wave. Similarly, Arthurs and Ziada 22 have reported that the acoustic tone generated by a high-speed jet impinging on a rigid plate is closely related to the jet instabilities and the resonant acoustic modes occurring between the nozzle and the plate.…”

Section: Introductionmentioning

confidence: 99%

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

Deng

Kang

Ding

et al. 2017

Advances in Mechanical Engineering

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A preliminary experimental investigation was performed with a focus on the axial pressure oscillations of self-resonating pulsed waterjet under different impinging surfaces. Five target plates of different impinging surfaces were impinged by self-resonating pulsed waterjets at various standoff distances and under four inlet pressures. It was found that the geometry of impinging surface significantly affects the pressure oscillation peak and amplitude of self-resonating pulsed waterjet, and the influences largely depend on the inlet pressure. Both the pressure oscillation peak and the amplitude increase to their maximum and then drop with increasing standoff distance, which is regardless of the geometry of impinging surface. But the geometry influences the values of the optimum standoff distance and the oscillation peak and amplitude. Compared with the trend of pressure oscillation peak against standoff distance, the oscillation amplitude can be more obviously changed by the impinging surface. Moreover, an assumption that the geometry affects the pressure oscillation peak by the rebound waterjets and hydroacoustic waves has been proposed based on related literature. Further study should be conducted to clarify the relations between the axial pressure oscillation and the geometry of impinging surface.

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Jet-plate interaction tones relevant to over-the-wing engine mount concept

Tam

Chandramouli

2020

Journal of Sound and Vibration

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Effect of impinging plate geometry on the self-excitation of subsonic impinging jets

Cited by 13 publications

References 18 publications

Experimental and Theoretical Investigations of Edge Tones in High Speed Jets

Experimental and Theoretical Investigations of Edge Tones in High Speed Jets

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

Jet-plate interaction tones relevant to over-the-wing engine mount concept

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