Reacting shock bubble interaction

Haehn, Nicholas; Ranjan, Desh; Weber, Chris; Oakley, Jason; Rothamer, David; Bonazza, Riccardo

doi:10.1016/j.combustflame.2011.10.015

Cited by 54 publications

(13 citation statements)

References 47 publications

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“…scitation.org/journal/phf a heavy bubble filled with a combustible gas mixture, the high-pressure and high-temperature area induced by the shock ignites the gas mixture through either deflagration or detonation. 22,23 In the SAIF literature, circular cylinder (two-dimensional form) and spherical bubble (three-dimensional form) geometries are commonly used to investigate SAIFs because of their simple configurations and ease of generation in experimental operations. Although there is a dimensional difference between a cylinder and a sphere, there are obvious similarities in their shock-interface interactions.…”

Section: Articlementioning

confidence: 99%

Numerical study on the jet formation of simple-geometry heavy gas inhomogeneities

et al. 2019

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Section: Articlementioning

confidence: 99%

Numerical study on the jet formation of simple-geometry heavy gas inhomogeneities

et al. 2019

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“…The shapes of the gas interface in previous studies mainly include the single-mode interface (Meshkov 1969;Brouillette 2002;Jacobs & Krivets 2005;Mariani et al 2008;Long et al 2009;Balakumar et al 2012;, the spherical or cylindrical bubble formed by a soap film (Haas & Sturtevant 1987;Hosseini & Takayama 2005;Layes, Jourdan & Houas 2009;Haehn et al 2011Haehn et al , 2012Zhai et al 2011;Si et al 2012), the membrane-less gas cylinder (Jacobs 1992(Jacobs , 1993Tomkins et al 2008;Zhai et al 2014;Zou et al 2010) or gas curtain Orlicz et al 2009;Balakumar et al 2012;Balasubramanian et al 2012;Tomkins et al 2013) formed by the jet technique and the inclined planar interface (Wang et al 2012;McFarland et al 2014). Besides these classical interface shapes, Mikaelian (2005) theoretically and numerically studied the RMI on an initial interface with a discontinuous change in its first derivative.…”

Section: Introductionmentioning

confidence: 99%

On the interaction of a planar shock with a light polygonal interface

Zhai

Wang

et al. 2014

J. Fluid Mech.

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The interaction of a planar shock wave with a polygonal N 2 volume surrounded by SF 6 is investigated experimentally and numerically. Three polygonal interfaces (square, triangle and diamond) are formed by the soap film technique developed in our previous work, in which thin pins are introduced as angular vertexes to connect adjacent sides of polygonal soap films. The evolutions of the shock-accelerated polygonal interfaces are then visualized by a high-speed schlieren system. Wave systems and interface structures can be clearly identified in experimental schlieren images, and agree well with the numerical ones. Quantitatively, the movement of the distorted interface, and the length and height of the interface structures are further compared and good agreements are achieved between experimental and numerical results. It is found that the evolution of these polygonal interfaces is closely related to their initial shapes. In the square interface, two vortices are generated shortly after the shock impact around the left corner and dominate the flow field at late stages. In the triangular and diamond cases, the most remarkable feature is the small 'SF 6 jet' which grows constantly with time and penetrates the downstream boundary of the interface, forming two independent vortices. These distinct morphologies of the three polygonal interfaces also lead to the different behaviours of the interface features including the length and height. It is also found that the velocities of the vortex pair predicted from the theory of Rudinger and Somers (J. Fluid Mech., vol. 7, 1960, pp. 161-176) agree with the experimental ones, especially for the square case. Typical free precursor irregular refraction phenomena and the transitions among them are observed and analysed, which gives direct experimental evidence for wave patterns and their transitions at a slow/fast interface. The velocities of triple points and shocks are experimentally measured. It is found that the transmitted shock near the interface boundary has weakened into an evanescent wave.

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“…In addition to the single-mode interface, spherical and cylindrical interfaces were also extensively investigated as the most classical categories of the RMI. The soap film technique was adopted in most experiments to generate the spherical gas interface with or without support (Haas & Sturtevant 1987;Hosseini & Takayama 2005;Ranjan et al 2005Ranjan et al , 2008Layes, Jourdan & Houas 2009;Zhai et al 2011;Haehn et al 2012;Si et al 2012) to study the shock-bubble interaction. The shock phenomena, such as shock refraction, diffraction and focusing, were also discussed, using acoustic theory (Haas & Sturtevant 1987) and high-speed diagnostic technique (Zhai et al 2011), for example.…”

Section: Introductionmentioning

confidence: 99%

On the interaction of a planar shock with an polygon

Luo

Wang

et al. 2015

J. Fluid Mech.

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The interaction of a planar shock wave (M ≈ 1.2) with an SF 6 polygonal inhomogeneity surrounded by air is experimentally investigated. Six polygons including a square, two types of rectangle, two types of triangle, and a diamond are generated by the soap film technique developed in our previous work, in which thin pins are used as angular vertexes to avoid the pressure singularities caused by the surface tension. The evolutions of the shock-accelerated SF 6 polygons are captured by a high-speed schlieren system from which wave systems and the interface characteristics can be clearly identified. Both regular and irregular refraction phenomena are observed outside the volume, and more complex wave patterns, including transmitted shock, refracted shock, Mach stem and the interactions between them, are found inside the volume. Two typical irregular refraction phenomena (free precursor refraction, FPR, and free precursor von Neumann refraction, FNR) are observed and analysed, and the transition from FPR to FNR is found, providing the experimental evidence for the transition between different wave patterns numerically found in the literature. Combined with our previous work (Zhai et al., J. Fluid Mech., vol. 757, 2014, pp. 800-816), the reciprocal transitions between FPR and FNR are experimentally confirmed. The velocities and trajectories of the triple points are further measured and it is found that the motions of the triple points are self-similar or pseudo-stationary. Besides the shock dynamics phenomena, the evolutions of these shocked heavy polygonal volumes, which are quite different from the light ones, are captured and found to be closely related to their initial shapes. Specifically, for square and rectangular geometries, the different width-height ratios result in different behaviours of shock-shock interaction inside the volume, and subsequently different features for the outward jet and the interface. Quantitatively, the time-variations of the interface scales, such as the width and the normalized displacements of the edges, are obtained and compared with those from previous work. The comparison illustrates the superiority of the interface formation method and the significant effect of the initial interface shape on the interface features. Furthermore, the characteristics of the vortex core, including the velocity and vortex spacing, are experimentally measured, and the vortex velocity is compared with those from some circulation models to check the † Email address for correspondence: sanjing@ustc.edu.cn Interaction of planar shock waves with SF 6 polygons 367 validity of the models. The results in the present work enrich understanding of the shock refraction phenomenon and the database of research into Richtmyer-Meshkov instability (RMI).

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Reacting shock bubble interaction

Cited by 54 publications

References 47 publications

Numerical study on the jet formation of simple-geometry heavy gas inhomogeneities

Numerical study on the jet formation of simple-geometry heavy gas inhomogeneities

On the interaction of a planar shock with a light polygonal interface

On the interaction of a planar shock with an polygon

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