Supersonic vortex rings

Baird, J. P.

doi:10.1098/rspa.1987.0005

Cited by 54 publications

(8 citation statements)

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“…In the axisymmetric case, these waves are partially obscured by the vortex ring, but they eventually combine and become visible in the form of an embedded shock within the vortex slightly ahead of its core. The present results give clear evidence for this interpretation of the development of the shock within the vortex and thus provide a correction of the widely accepted description of the starting process in (Baird 1987).…”

Section: Starting Processsupporting

confidence: 48%

Time-resolved visualization of shock–vortex systems emitted from an open shock tube

Kleine

Takehara

et al. 2009

J Vis

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When a shock wave leaves an open-ended shock tube, it generates a vortex ring that subsequently detaches from the shock tube and follows the expanding shock front. This classical problem of shock-vortex interaction has been visualized in unprecedented detail and temporal resolution by means of time-resolved shadow, schlieren and shearing interferometry sequences obtained with a newly developed ultrahigh-speed color video camera. This device is capable of taking 144 frames with full-frame resolution of 720 9 410 pixels at rates of up to one million frames per second. Apart from shadowgraphy, the visualization techniques used in this study were direction-and magnitude-indicating color schlieren and polychrome shearing interferometry. The process was observed both with the standard normal view of the flow field and with an oblique view, which facilitated the identification of some three-dimensional flow features. The obtained results clearly show the development of individual flow elements, including some that so far have eluded a proper description. One example is the secondary, counter-rotating vortex ring, which at a later time wraps around the main vortex ring before disintegrating upon merging with the shear layer that surrounds the gas exiting from the tube.

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Section: Starting Processsupporting

confidence: 48%

Time-resolved visualization of shock–vortex systems emitted from an open shock tube

Kleine

Takehara

et al. 2009

J Vis

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“…This observation is consistent with previous studies. 1,[21][22][23] The schlieren pictures indicate that the generated embedded shock wave travels with the main ring, as it accelerates downstream. The presence of the embedded shock wave could be attributed to the fact that the induced flow velocity in the region of the ring becomes supersonic in the frame of reference of the ring.…”

Section: Vortex Ring Propagationmentioning

confidence: 96%

Head-on collision of shock wave induced vortices with solid and perforated walls

Kontis¹,

An²,

Zare‐Behtash³

et al. 2008

Physics of Fluids

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An experimental study has been conducted to examine the interaction of shock wave induced vortices with a flat plate and a perforated plate. The experiments were carried out using a 30 mm internal diameter shock-tube at Mach numbers 1.31, 1.49, and 1.61 under critical driver conditions. Air was used both in the driver and driven sections. High-speed schlieren photography was employed to study the flow development and the resulting interactions with the plates. Wall pressure measurements on both plates were also carried out in order to study the flow interactions quantitatively. The experimental results indicated that a region of strong flow development is generated near the wall surface, due to the flow interactions of reflected waves and oncoming induced vortices. This flow behavior causes the generation of multiple pressure fluctuations on the wall. In the case of the perforated plate, a weaker initial reflected wave is produced, which is followed by compression waves, due to the internal reflections within the plate. The transmitted wave is reduced in strength, compared to the initial incident shock wave.

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“…7 This is similar to the embedded shock within axisymmetric vortex rings in shock tube studies performed by authors such as: Baird, 51 Minota, does not appear to be stable for long, and dissipates due to the interaction between the shock reflection patterns that occur outside the uniform area nozzle.…”

Section: Diffraction Regionmentioning

confidence: 52%

Compressible Flow Structures Interaction with a Two-Dimensional Ejector: A Cold-Flow Study

Zare‐Behtash

Kontis

2009

Journal of Propulsion and Power

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An experimental study has been conducted to examine the interaction of compressible flow structures such as shocks and vortices with a 2-D ejector geometry using a shock tube facility.Three diaphragm pressure ratios of P 4 /P 1 = 4, 8, and 12 have been employed, where P 4 is the driver gas pressure and P 1 is the pressure within the driven compartment of the shock tube. These lead to incident shock Mach numbers of M s = 1.34, 1.54, and 1.66, respectively. The length of the driver section of the shock tube was 700 mm. Air was used for both the driver and driven gases.

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Supersonic vortex rings

Cited by 54 publications

References 0 publications

Time-resolved visualization of shock–vortex systems emitted from an open shock tube

Time-resolved visualization of shock–vortex systems emitted from an open shock tube

Head-on collision of shock wave induced vortices with solid and perforated walls

Compressible Flow Structures Interaction with a Two-Dimensional Ejector: A Cold-Flow Study

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