Observation and analysis of scattering interaction between a shock wave and a vortex ring

Tokugawa, Naoko; Ishii, Yoshio; Sugano, Katsuya; Takayama, F.; Kambe, Tsutomu

doi:10.1016/s0169-5983(97)00004-x

Cited by 19 publications

(7 citation statements)

References 6 publications

(7 reference statements)

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“…The outer portion of the reflected shock wave is diffracted in the vortex core and bends as it passes around the core. The above description agrees with the experimental work of Tokugawa et al 26 It should be noted that the vortex ring maintains its compact structure for all shock Mach number cases examined. The numerical simulations that were carried out by Takayama et al 27 have shown that the region of the shock passing through the inside portion of the vortex ring is intensified due to a double-step mechanism.…”

Section: Interaction Of Reflected Shock Wave With Vortex Ringsupporting

confidence: 91%

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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Section: Interaction Of Reflected Shock Wave With Vortex Ringsupporting

confidence: 91%

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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“…Szumowski and Sobieraj [8] observed a slowly moving normal shock in the vortex plane, an undisturbed bow shock outside the vortex and a sound wave around the vortex core using Schlieren photographs. Tokugawa et al [9] observed the scattered waves generated during shock-vortex ring interaction for M = 1.23 from shadowgraph method using image processing and verified with computational results. They found that scattered waves are generated during the passage of shock over the vortex ring.…”

Section: Introductionmentioning

confidence: 69%

Characteristics of Noise Produced during Impingement of a Compressible Vortex Ring on a Wall

Thangadurai

Das

2010

International Journal of Aeroacoustics

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Noise produced during normal impingement of a compressible vortex ring on a flat surface is studied in the shock-Mach number (M) range of 1.31 to 1.55. The compressible vortex ring is generated at the open end of a short driver section shock tube. The far-field noise is decomposed into three major components; (i) sound field due to formation and evolution of the vortex ring, (ii) reflected shock and vortex ring interaction noise and (iii) noise due to impingement of the ring on the wall. The impingement noise consists of fluctuating pressure due to deformation and stretching of the vortex ring, formation and growth of a secondary wall vortex ring, lifting-off of the primary-secondary vortex ring pair. All these events are identified using discrete wavelet transform (DWT) of the sound pressure signal and verified with the laser sheet based flow visualizations. Acoustics fluctuations measured at different angular location shows that the noise due to wall-vortex ring interaction is dominant at 10°≤ θ ≤ 40°.

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“…Arakeri et al (2004) initiated the quantitative experimental study of compressible vortex rings using particle image velocimetry (PIV). Similarly, the study of interactions of a shock wave with a vortex ring (Takayama et al 1993, Tokugawa et al 1997, and the vortex ring with other generic bodies (Das et al 2016, Karunakar 2010, Minota, Nishida & Lee 1997, Mishra 2015, Poudel et al 2018 shows the prominence of compressibility and shocklets in such flows. The formation and evolution of CRVR at high Mach number has been studied in detail along with the effect of driver section lengths and shock Mach number by Murugan & Das (2007A, 2007B, 2008 using smoke flow visualization.…”

mentioning

confidence: 95%

Characteristics of shock tube generated compressible vortex rings at very high shock Mach numbers

et al. 2021

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Compressible vortex rings, usually formed at the open end of a shock tube, often show interesting phenomena during their formation, evolution, and propagation depending on the shock Mach number (Ms) and exit flow conditions. The Mach number of the translating compressible vortex rings (Mv) investigated so far in the literature is subsonic as, the shock tube pressure ratio (PR) considered is relatively low. In this numerical study we focus on low to high vortex ring Mach numbers (0.31 < Mv < 1.08) cases with a particular focus on very high Mv cases that are not been reported in experiments as, it is difficult to obtain in laboratory. Using hydrogen as a driver section gas inside the shock tube, a supersonic compressible vortex ring (Mv > 1) is obtained for first time.It is established that the SST k-ω based DES turbulent model replicates the experimental observation better than the previously published results at different stages of development of the vortex ring. DES, which is an inbuilt hybrid of LES and RANS approaches is evoked that can automatically switch to the sub-grid scale (SGS) model in the LES regions (i.e. with different scale vortical structures) and to a RANS model in the rest of the region (i.e. where the grid spacing is greater than the turbulent length scale). The DES model can predict characteristics of the shear layer vortices as well as counter-rotating vortex rings (CRVRs) as reported in the experimental measurements. Formation of multiple triple points and the corresponding slip-stream shear layers and thus multipleCRVRs behind the primary vortex ring at different radial locations, in addition to the usual CRVRs, appears to be a unique characteristic for high Mach number vortex rings. For high PR, H2, case during formation stage, a vortex layer of reverse circulation (that of primary vortex ring) is formed from the outer wall of the shock tube, whose instability formed another series of opposite circulation vortices which interfere with the primary vortex ring considerably. Also, near the central zone, a near stationary slipstream vortex and multiple, fast moving tiny vortices of opposite circulation to slipstream vortex are observed. Mechanisms for formation of these complex vortex structures are identified. The implications of these phenomena on vortex rings' geometric and kinematic characteristics such as ring diameter, core diameter, circulation, translational velocity as well as vortex Mach number are discussed in detail illustrating their differences with low PR cases.

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Observation and analysis of scattering interaction between a shock wave and a vortex ring

Cited by 19 publications

References 6 publications

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

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

Characteristics of Noise Produced during Impingement of a Compressible Vortex Ring on a Wall

Characteristics of shock tube generated compressible vortex rings at very high shock Mach numbers

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