Detonation Burning of a Kerosene-Air Mixture in a Radial Vortex Chamber with Geometry Variations at the Entrance and Exit
F. A. Bykovskii, S. A. Zhdan, E. F. Vedernikov
Lavrentyev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: continuous spin detonation, radial vortex chamber, aviation kerosene, air, flow structure
Abstract
Regimes of detonation burning of a two-phase mixture consisting of TS-1 aviation kerosene and air in a radial vortex chamber 500 mm in diameter with exhaustion toward the center and geometry variations at the combustor entrance and exit are obtained and studied. Air is injected into the combustor through a vortex injector, and kerosene purged with air was injected through oppositely directed channels. Optical registration of the process was performed through transparent windows in the combustor by a high-speed camera with a frequency of 420000 frames per second. The flow pattern observed in the combustor with a free exit and an expanding nozzle is continuous spin detonation with one detonation wave rotating with a velocity of 1.68-2.17 km/s close to the Chapman-Jouguet detonation velocity or pulsed detonation with radial waves with a frequency of 0.14-0.26 kHz. Mounting of radial partitions yields pulsed detonation or combustion. In continuous spin detonation, the air flow rate is 3.6-11.7 kg/s, the kerosene flow rate is 0.2-0.77 kg/s, and the equivalence ratio varies from 0.63 to 2.5.
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