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Showing 1 to 11 of 11 for “"Flameholder"”.
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Computations of nonreacting flameholder flows with a zonal grid method
… the computation of flow fields behind a two-ring flameholder which forms a multiple-connected region. A standard K - ε model is used to close the system. The calculation is performed by using a SIMPLE type algorithm in two subdomains in a body-fitted coordinate system With nonstaggered grid …
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Mixing and sustained combustion in a cavity flameholder for scramjet propulsion
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Evaluation of a Strut-Plasma Torch Combination as a Supersonic Igniter-Flameholder
… engine. In general, both an igniter and a flameholder are needed to achieve and maintain supersonic combustion. The current work examines a plasma torch-strut combination as an igniter-flameholder. The plasma torch-strut combination was tested in the Virginia Tech unheated supersonic wind …
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Effect of Flow Distortion on Fuel Mixing and Combustion in an Upstream-Fueled Cavity Flameholder for a Supersonic Combustor
… fuel distribution and combustion within a cavity flameholder with upstream fuel injection. The effect of the shockwave location (on the upstream fuel jet or over the cavity) and shock angle are controlled by adjusting a shock generator mounted in the tunnel test section. The effect of fuel …
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Flameholding methods for compact hypersonic systems
… their performance in combination with a cavity flameholder. It was observed that the hypermixer geometries enhanced fuel-air mixing and flameholding through turbulent flame production as well as an enhancement of cavity activity, and were suited for establishment of ram-mode combustion. …
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A method for the numerical analysis of combustion instabilities with an application to afterburner screech
… by acoustic transverse modes at the afterburner flameholder. These vortices trap fresh reactants that burn after a certain time delay, therefore feeding energy into the oscillation. Within a linear approximation, the effect of small amplitude acoustic fluctuations on the flame is studied by …
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Uncooled choked plasma torch for ignition and flameholding in supersonic combustion
… torch was designed to be used as an ignitor and flameholder in supersonic combustion. The anode and cathode were made of two-percent thoriated tungsten, and no cooling system was required. Sonic flow through the nozzle was obtained by using a small throat diameter (0.813 mm). The plasma torch can …
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The development and operating characteristics of an improved plasma torch for supersonic combustion applications
… torch, which has been used as an ignitor and flameholder in supersonic combustion studies, has been modified in order to decrease the electrode wear and to increase stability. The plasma torch can be used as a source of hydrogen or nitrogen radicals which initiate and stabilize combustion. …
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A Study of Plasma Ignition Enhancement for Aeroramp Injectors in Supersonic Combustion Applications
… results, a candidate scramjet igniter and flameholder was designed. The design was observed to exhibit a synergistic effect between the plasma igniter and fuel injector in that the fuel injector provides not only a subsonic region for plasma ignition, but also lifts the combustion enhancing …
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Ignition and flameholding in supersonic flow by injection of dissociated hydrogen
… was shown to be a very effective igniter and flameholder for scramjet operation over a simulated flight envelope (Mach 3 to Mach 6, low to moderate altitudes).
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Development of high-speed laser diagnostics for the study of advanced propulsion systems
… phenomena within a supersonic wind tunnel cavity flameholder, the development and demonstration of a 50-kHz OH PLIF system using a small-scale turbulent flame, the development and demonstration of 10-kHz PLIF of the nitric oxide (NO) molecule, and the development and demonstration of a novel …