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Showing 1 to 20 of 25 for “"oblique shock"”.
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Oblique shock interactions With perturbed density interfaces
… formed by the interaction of a planar shock wave and a cylindrical column of gas seeded with glycol droplets. Seeding a fluid flow with a passive tracer is a common practice in experimental fluids research and it is important to understand how these tracers behave. It will be shown that …
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Oblique shock interactions with gas cylinder interfaces
… study of fluid instabilities formed due to an oblique interatction of a shock wave with a cylindrical gas column seeded with glycol droplets. Two gases are injected into quiescent air to form the column. The first is sulfur hexafluoride (SF6) which generates the well-known Richtmyer-Meshkov …
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Oblique Shock Wave Effects on Impulsively Accelerated Heavy Gas Column
… to elucidate the fundamental physics of shock-induced mixing for a simple three-dimensional interface. The interface studied consists of a gravity stabilized SF6-based heavy gas jet that produced a circular column with a diffuse interface into the surrounding air. The effects of density …
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Planar and oblique shock wave interaction with a droplet seeded gas cylinder
We present an experimental study of a shock interaction with an initially diffuse heavy-gas cylinder seeded with submicron-scale glycol droplets. Unlike most earlier studies, the investigation covers not just a quasi-two-dimensional geometry, where the axis of the cylinder is parallel to the plane …
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Corner effects for oblique shock wave/turbulent boundary layer interactions in rectangular channels
… cross-section wind tunnel a separated oblique shock reflection is set to interact with the turbulent boundary layer (oblique SBLI) both on the bottom wall and in the corner formed by the intersection of the floor with the side-walls. In such a scenario, shock-induced separation is often …
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Focusing of weak shock waves and the von Neumann paradox of oblique shock reflection
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1992.
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Analysis of Kelvin-Helmholtz Instabilities Developing from Oblique Shock Interaction with a Heavy Gas Column
… study of instabilities developing from oblique shock wave interaction with a heavy gas column. For these experiments, the gas column consists of pure sulfur hexafluoride infused with ~11% acetone gas by mass. A misalignment of the pressure and density gradients (from the shock wave) …
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The effects of pressure waves on turbulent oblique shock wave boundary layer interactions in rectangular channels
Oblique Shock Wave--Boundary-Layer interactions (oblique SBLIs) occur in many practical applications, such as in mixed compression supersonic jet intakes and transonic compressor cascades and can have significant detrimental effects on the downstream boundary layer, resulting in flow distortion, …
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Numerical study of mach number effects in compressible wall-bounded turbulence
… channel flow and a study of the impinging shock/turbulent boundary-layer interaction. For the channel flow, an energy sink is introduced in the energy equation to effectively eliminate the compressibility effects caused by mean-property variation, isolating the intrinsic compressibility …
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High speed geological boundary layer flows
… and schlieren. Schlieren images show resulting shock interaction with the plate boundary and are compared to the separation of the two blast zones at Mount St. Helens. Pressure sensitive paint and shear stress sensitive films were used to monitor transition locations along the boundary and …
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Detonation modelling of non-ideal high explosives
… a detonation; a supersonic wave consisting of a shock wave coupled to chemical energy release. Detonations in conventional HE (CHE) propagate with a typical velocity of 6 - 8 km/s. Insensitive HE (IHE) and non-ideal HE (NIHE) are of particular interest as they are harder to initiate and thus …
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Bioagent defeat in shock driven gas flow
The problem of planar shock interaction with gas cylinders whose axis of symmetry is parallel to the plane of the shock has been well studied both experimentally and numerically, and in this case, the flow evolution driven by Richtmyer-Meshkov instability is well characterized (although, as this …
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Experimental study of supersonic slot injection into a supersonic stream
… boundary layer had merged. The effect of a weak shock interaction upon the shear layer was also investigated. An oblique shock, generated on the upper wall with a wedge, impinged on the shear layer. The shock wave had a nominal pressure ratio of 1.82, which did not result in separation of the …
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Numerical Analysis of the Viscous Flow in a Supersonic Diffuser
… diffusers are based on compression through shock waves. This process is inherently inefficient because of the large losses caused by the shocks. We investigate by means of Computational Fluid Dynamics (CFD) the viscous flow in a supersonic diffuser designed by means of inviscid theory to …
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Investigation of Injectant Molecular Weight and Shock Impingement Effects on Transverse Injection Mixing in Supersonic Flow
… wide range of molecular weights. Second, since shocks are ubiquitous in scramjet combustors, their influence on penetration and mixing was also studied by arranging for an oblique shock to impinge near the injection station. The cases of a shock impinging upstream and downstream of the injector …
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Laminar/transitional shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flows
Numerical investigations of laminar shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flow have been carried out at M? = 6.85 and M? ? 8, with unit Reynolds numbers ranging from 2.0 x 106 m- l to 7.60 x 106 m- l. This thesis deals with a simplified 2-D geometric configuration to …
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Laboratory Experiments of High-Energy-Density Shocks in Magnetized Supersonic Plasma Flows
Magnetized shocks are of interest in many astrophysical environments, in which high Mach number flows interact with ambient media, planetary obstacles, and/or spacecraft to generate strongly radiating shocks. Some examples include extrastellar jets from radio galaxies, relativistic jets from …
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Experimental Investigation of Shock-Shock Interactions over a 2-D Wedge at M = 6
… and sweep angle on peak heating rates due to shock-shock interactions were investigated in the NASA Langley Research Center 20-inch Mach 6 Air Tunnel. The fin model leading edges, which represent cylindrical leading edges or struts on hypersonic vehicles, were varied from 0.25 inches to 0.75 …
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Sidewall effects in compression corner shock-wave/boundary-layer interactions
… inlets and research wind tunnels. When a shock wave boundary layer interaction (SBLI) occurs in a rectangular cross sectioned duct, the streamwise corner flows tend to separate, resulting in highly three-dimensional behaviour in the sidewall region. These corner separations have been seen …
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New efficient contact discontinuity capturing techniques in supersonic flow simulations
… N-scheme based solvers. Results for a simple oblique-shock reflection and a shear wave demonstrate that the adaptive procedure and the higher order low diffusion scheme provide sharper resolution than the dimensionally-split kinetic CIR scheme and the first order N-scheme. Moreover, no …
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