Propagation and Reflection of Shock Waves

Shugaev, F. V.; Shtemenko, Ludmila S.

doi:10.1142/9789812817150

Cited by 18 publications

(13 citation statements)

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“…By quantitative comparisons it was demonstrated that the branches undergo refraction in full agreement with Snell's law. These findings support an interpretation of the flux front dynamics at its fast initial stage as propagation of a damped shock electromagnetic wave of the kink type; see, e.g., [30]. We ascribe these waves to damped electromagnetic modes similar to those considered in Ref.…”

Section: -3supporting

confidence: 89%

Ray optics behavior of flux avalanche propagation in superconducting films

et al. 2015

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Experimental evidence of wave properties of dendritic flux avalanches in superconducting films is reported. Using magneto-optical imaging the propagation of dendrites across boundaries between a bare NbN film and areas coated by a Cu-layer was visualized, and it was found that the propagation is refracted in full quantitative agreement with Snell's law. For the studied film of 170 nm thickness and a 0.9 µm thick metal layer, the refractive index was close to n = 1.4. The origin of the refraction is believed to be caused by the dendrites propagating as an electromagnetic shock wave, similar to damped modes considered previously for normal metals. The analogy is justified by the large dissipation during the avalanches raising the local temperature significantly. Additional time-resolved measurements of voltage pulses generated by segments of the dendrites traversing an electrode confirm the consistency of the adapted physical picture.

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Section: -3supporting

confidence: 89%

Ray optics behavior of flux avalanche propagation in superconducting films

et al. 2015

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“…In the 1950s of the previous century, many studies regarding the effect of the diaphragm opening time on the generated shock wave were published; examples are the works of Glass and Patterson [2], Henshall [3], White [4] and Shugaev et al [5]. However, only recently attention has been drawn to the effect that the ratio between the diaphragm open area and that of the tube cross section has on the generated shock wave.…”

Section: General State Of the Artmentioning

confidence: 99%

The effects that changes in the diaphragm aperture have on the resulting shock tube flow

et al. 2012

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International audienceIn a conventional shock tube, the driver and the driven sections have similar (if not identical) cross-sectional area and the diaphragm opened area, upon rupturing, is practically equal to the tube cross-sectional area. Such geometry results in generating a well-formed shock wave in the tube's driven section. The present experimental work checks the effects that changes in the diaphragm ruptured area have on the generated shock and rarefaction waves. Experiments were conducted in an 80 mm by 80 mm cross section shock tube generating incident shock waves having Mach numbers within the range from 1.06 to 1.25. In each run, pressure histories were recorded along the driven and the driver sections of the shock tube. The recorded pressures reveal that progressive reduction in the diaphragm open space resulted in a weaker shock and both longer time and distance until the compression waves generated close to the diaphragm coalesces into a shock wave. In addition, reducing the open space of the diaphragm resulted in a significant slow down in the high pressure reduction prevailing in the driver section

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“…5 The thresholdvalue of focused laser beam intensity for creating breakdown in gases at optical frequencies is proportional to .I w 2 /=.t p 0 /, where I is the ionization potential, w is the frequency of laser radiation, t is the duration of laser pulse, and p 0 is the initial gas pressure. 10 Once the energy of the focused laser beam exceeds this value, ambient air breaks down with subsequentformation of laser plasma. This in turn generates an outward propagatingblast wave.…”

Section: Methodsmentioning

confidence: 99%

Micro-shock waves generated inside a fluid jet impinging on plane wall

Jagadeesh¹,

Onodera²,

Ogawa³

et al. 2001

AIAA Journal

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An Nd:glass laser pulse (18 ns, 1.38 J) is focused in a tiny area of about 100-¹m diam under ambient conditions to produce micro-shock waves. The laser is focused above a planar surface with a typical standoff distance of about 4 mm. The laser energy is focused inside a supersonic circular jet of carbon dioxide gas produced by a nozzle with internal diameter of 2.9 mm and external diameter of 8 mm. Nominal value of the Mach number of the jet is around 2 with the corresponding pressure ratio of 7.5 (stagnation pressure/static pressure at the exit of the nozzle). The interaction process of the micro-shock wave generated inside the supersonic jet with the plane wall is investigated using double-pulse holographic interferometry. A strong surface vortex eld with subsequent generation of a side jet propagating outward along the plane wall is observed. The interaction of the micro-shock wave with the cellular structure of the supersonic jet does not seem to in uence the near surface features of the ow eld. The development of the coherent structures near the nozzle exit due to the upstream propagation of pressure waves seems to be affected by the outward propagating micro-shock wave. Mach re ection is observed when the micro-shock wave interacts with the plane wall at a standoff distance of 4 mm. The Mach stem is slightly de ected, indicating strong boundary-layer and viscous effects near the wall. The interaction process is also simulated numerically using an axisymmetric transient laminar Navier-Stokes solver. Qualitative agreement between experimental and numerical results is good.

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Propagation and Reflection of Shock Waves

Cited by 18 publications

References 0 publications

Ray optics behavior of flux avalanche propagation in superconducting films

Ray optics behavior of flux avalanche propagation in superconducting films

The effects that changes in the diaphragm aperture have on the resulting shock tube flow

Micro-shock waves generated inside a fluid jet impinging on plane wall

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