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Showing 1 to 13 of 13 for “"shock interactions"”.
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Oblique shock interactions with gas cylinder interfaces
… 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 Instability (RMI) when …
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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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Radio observations as a tool to study shock interactions and mass ejections in novae
… the dense equatorial disc, resulting in shocks and particle acceleration. The individual synchrotron flares may be associated with density enhancements in the equatorial disc and/or velocity variations in the wind from the white dwarf. This overall scenario is similar to a common picture …
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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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Estimation of Unsteady Nonuniform Heating Rates from Surface Temperature Measurements
Shock wave interactions such as those that occur during atmospheric re-entry, can produce extreme thermal loads on aerospace structures. These interactions are reproduced experimentally in hypersonic wind tunnels to study how the flow structures relate to the deleterious heat fluxes. In these …
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Asymmetries in extragalactic radio sources
… for narrow angle tails. The second considers jet-shock interactions as a model for wide angle tails. The third tries out jet-cloud interactions as a model for the largest of wide angle tails. The fourth uses wall-jets as a model for hot spot formation.
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Numerical modelling of plasmas formed and magnetically controlled in hypersonic flows
… flows, the pressures and temperatures in the shock layer can become so extreme that dissociation and ionisation reactions produce a weakly ionised plasma. Owing to its elevated electrical conductivity, the plasma can be actively manipulated via magnetohydrodynamic (MHD) effect when a magnetic …
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Computational Assessment of Flow through a High-Flow Nacelle Bypass for Low Supersonic Boom
… flow predictions as well as strong turbulence-shock interactions. The clean and vaned aft bypass sections exhibit reasonable agreement with the experimental data but show a stronger influence of the turbulence model on predictive accuracy due to a laminar-turbulent transition affecting the …
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Modeling of shock boundary layer interactions and stability analysis using particle approaches
Hypersonic flow separation and laminar shock wave boundary layer interactions (SWBLIs) have received considerable attention since these interactions can lead to laminar to turbulent transition, unsteadiness, and localized high pressure and heating regions. Accurate predictions of these phenomena, …
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Preconditioned conjugate gradient methods for the Navier-Stokes equations
… transonic turbine cascade) and hypersonic flow (shockon- shock interactions on a cylindrical leading edge at Mach 6.0) are presented. For the 1vfach 0.1 case, speed-up factors of 30 (in terms of iterations) and 20 (in terms of CPU time) are found in favor of the new solver when compared with the …
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Characterization and Analysis of Supersonic Flow Through De Laval Nozzles at Varied Design Conditions
… including internal separation and a well-defined shock structure. Decreasing the operating nozzle pressure ratio led to increased separation shock strength and more significant effects of overexpansion on nozzle performance and thrust capability. The shock interactions with the separated shear …
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Investigation of Inlet Guide Vane Wakes in a F109 Turbofan Engine with and without Flow Control
… fan speeds show constructive and destructive interactions over each blade pass generated by the fan potential flow field. Time resolved wake profiles for the transonic fan speeds show that shock interactions with the IGV surface result in the wake shedding off of the vane at the BPF. …
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The role of aerothermochemistry in double cone and double wedge flows
… iv) to extend the experimental database for shock wave boundary/layer interactions. An expansion tube is used to generate flows with enthalpies ranging from 2.2-8.0 MJ/kg (2-4 km/s) and Mach numbers from 4-7. The expansion tube is a novel impulse facility for accelerating a test gas to these …