Heat fluxes to combustor walls during continuous spin detonation of fuel-air mixtures |
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Authors: | F A Bykovskii E F Vedernikov |
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Affiliation: | (1) Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia |
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Abstract: | Pioneering measurements of heat fluxes to the walls of flow-type combustors of different geometries were performed in regimes
of continuous spin detonation of fuel-air mixtures under unsteady heating. These heat fluxes are compared with those observed
in the regime of conventional turbulent combustion in the same combustor. Air is used as an oxidizer, and acetylene or hydrogen
is used as a fuel. For identical flow rates of the fuel, the heat fluxes to the combustor walls in regimes of continuous spin
detonation and conventional combustion are close to each other; their mean steady values are ≈1 MW/m2 (≈0.5% of the enthalpy flux of the products over the channel cross section). In both detonation and combustion regimes, the
maximum heat fluxes penetrate into the walls in the mixing region (where the heat release occurs). In the case of detonation,
regenerative cooling of the combustor walls by the flow of the fresh mixture occurs in the heat-release region (region of
propagation of the detonation-wave front). The regeneration becomes less effective in the downstream direction because of
the shorter time of contact between the walls and the cold mixture and a longer time of contact between the walls and the
hot products. More intense heating persists downstream of the front, where the regeneration ceases, but the temperature of
the products is high. The character of heating of the wall in the region of rotation of the front of spin detonation waves
depends on the number of these waves: the zone of the maximum heat release becomes narrower with increasing number of waves.
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Translated from Fizika Goreniya i Vzryva, Vol. 45, No. 1, pp. 80–88, January–February, 2009. |
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Keywords: | continuous spin detonation of the fuel flow-type combustor fuel-air mixtures heat fluxes to the walls |
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