Non-oscillating/Oscillating Shear Layer over a Large Deep Cavity at Low-Subsonic Speeds

Hassan, Mouhammad El; Keirsbulck, Laurent; Labraga, L.

doi:10.1007/s10494-008-9181-z

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…The boundary layer was characterized just upstream from the cavity leading edge. Hotwire measurements of velocity profiles at this location showed that for low velocity (U 0 = 2 m/s) the boundary layer was fully developed [12]. This was also the case for U 0 = 43 m/s [13].…”

Section: Wind Tunnel and Cavity Model Detailssupporting

confidence: 55%

“…For the same cavity configuration, the authors showed in previous studies (El Hassan et al [12], Keirsbulck et al [13]) that the cylinder in cross flow is an effective device for suppressing acoustic resonance. It was stated in the literature [4][5][6] that the high frequency forcing (pulsing effect) of the cylinder is responsible for the cavity tone attenuation.…”

Section: Cylinder and Shaped Cylinder Control Of The Cavity Resonancementioning

confidence: 92%

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Passive control of deep cavity shear layer flow at subsonic speed

Hassan

Keirsbulck²

2017

Can. J. Phys.

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Passive control of the flow over a deep cavity at low subsonic velocity is considered in the present paper. The cavity length-to-depth aspect ratio is L/H = 0.2. particle image velocimetry (PIV) measurements characterized the flow over the cavity and show the influence of the control method on the cavity shear layer development. It is found that both the “cylinder” and the “shaped cylinder”, placed upstream from the cavity leading edge, result in the suppression of the aero-acoustic coupling and highly reduce the cavity noise. It should be noted that the vortical structures impinge at almost the same location near the cavity downstream corner with and without passive control. The present study allows to identify an innovative passive flow control method of cavity resonance. Indeed, the use of a “shaped cylinder” presents similar suppression of the cavity resonance as with the “cylinder” but with less impact on the cavity flow. The “shaped cylinder” results in a smaller shear layer growth than the cylinder. Velocity deficiency and turbulence levels are less pronounced using the “shaped cylinder”. The “cylinder” tends to diffuse the vorticity in the cavity shear layer and thus the location of the maximum vorticity is more affected as compared to the “shaped cylinder” control. The fact that the “shaped cylinder” is capable of suppressing the cavity resonance, despite the vortex shedding and the high frequency forcing being suppressed, is of high interest from fundamental and applied points of view.

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Section: Wind Tunnel and Cavity Model Detailssupporting

confidence: 55%

Section: Cylinder and Shaped Cylinder Control Of The Cavity Resonancementioning

confidence: 92%

Passive control of deep cavity shear layer flow at subsonic speed

Hassan

Keirsbulck²

2017

Can. J. Phys.

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“…Therefore, a resonance occurs in the supply chamber that will further excite the jet. Such aero-acoustic coupling is similar to that found in rectangular cavities [27][28][29]. Johnson et al [23,26] developed an organ-pipe cavitating jet called "CAVIJET" for achieving a structured jet through a passive resonating principle (Figure 2).…”

Section: Self-resonating Cavitating Jetssupporting

confidence: 53%

“…Therefore, a resonance occurs in the supply chamber that will further excite the jet. Such aero-acoustic coupling is similar to that found in rectangular cavities [27][28][29]. Many experimentations and acoustic analyses of cavitation jets led to the following formula for the estimation of the organ pipe length for a maximum resonance [10,[30][31][32]:…”

Section: Self-resonating Cavitating Jetsmentioning

confidence: 84%

A Review on the Erosion Mechanism in Cavitating Jets and Their Industrial Applications

et al. 2021

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Cavitating jets have been widely studied for over a century, but despite the extensive literature on this subject, the implementation of cavitating jets in many industries is still very limited due to technical challenges. The main purpose of the present paper is to provide recommendations on using the cavitating jets based on a comprehensive literature review on the erosion mechanism in these jets. Self-resonating jets are extensively discussed in the present paper due to their importance in amplifying the erosion effect of cavitating jets. The influence of different jet nozzle geometric parameters and the operating conditions of the cavitating jet flow on the erosion mechanism is also discussed. Finally, well drilling in addition to multiple other industrial applications of cavitating jets are examined.

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“…The vortices can be identified with Q ‐criterion,

Q = \frac{1}{2} ((), {‖bold-italicΩ‖}_{F}^{2} - {‖bold-italicS‖}_{F}^{2})

, where

bold-italicΩ = \frac{1}{2} ((), \nabla bold-italicu - {(\nabla u)}^{T})

is the rotation tensor,

bold-italicS = \frac{1}{2} ((), \nabla bold-italicu + {(\nabla u)}^{T})

is the strain‐rate tensor, the ||·|| F is the Frobenius norm, and u is the velocity field . Figure a demonstrates the three‐dimensional structure of the center spiral vortex and two satellite vortices around it at Re = 190 which is identified by the Q ‐criterion.…”

Section: Resultsmentioning

confidence: 99%

Trapping region of impinging jets in a cross‐shaped channel

Zhang

Yao²,

et al. 2019

AIChE Journal

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This study follows our previous report (Zhang et al., Phys. Fluids, vol. 31, 2019, 034105) by describing the formation and evolution of the engulfment flow in the cross-shaped channel. First, the flow regimes were studied by planar laser induced fluorescence (PLIF). Results show the formation of a spiral vortex in the center of the chamber and the appearance of a well-mixed zone inside the spiral vortex. Second, we proposed a novel experimental method to analyze the residence time of the fluid in the chamber, and discover an unexpected trapping region inside the well-mixed zone. There is almost no fluid transport into or out of this region. Furthermore, three-dimensional numerical simulation is used to reveal the origination of this trapping region. Simulation results reveal that the fluid recirculates in the trapping region and the flow feature is caused by the bubble-type vortex breakdown.

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Non-oscillating/Oscillating Shear Layer over a Large Deep Cavity at Low-Subsonic Speeds

Cited by 10 publications

References 18 publications

Passive control of deep cavity shear layer flow at subsonic speed

Passive control of deep cavity shear layer flow at subsonic speed

A Review on the Erosion Mechanism in Cavitating Jets and Their Industrial Applications

Trapping region of impinging jets in a cross‐shaped channel

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