Continuous Spin Detonation of Water-Fuel Emulsion with Cold Air in a 500 mm Diameter Radial Vortex Chamber
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, pulsating detonation, water-fuel emulsions, kerosene, air, transverse detonation waves, radial swirl combustion chamber
Abstract
In a 500 mm diameter vortex radial annular chamber, the modes of continuous spin and pulsating detonation of a water-fuel emulsion (water --- TS-1 kerosene) mixed with cold air with an initial temperature of 293 K were implemented and investigated. The mass fraction of water in the water-fuel emulsion varied in the range of 0.12 ÷ 0.38. At a mass fraction of water no more than 0.16, modes with a single transverse detonation wave were observed in the range of mixture flow rates of 17.7 ÷ 23.54 kg/s at an excess fuel coefficient of 1.0 ÷ 1.53. The rotation velocity of the transverse detonation waves was 1.78 ÷ 2.03 km/s. The upper limit of the continuous spin detonation modes for the mass fraction of water in kerosene was determined -- 0.16 ÷ 0.17. Moreover, in the range of 0.17 to 0.38, pulsating detonation occurs with radial pulsation frequencies of 0.09 to 0.33 kHz. It was shown that with water added to the emulsion in amounts of no more than 16%, the detonation velocity, thrust, and specific impulses are close to those of continuous spin detonation of pure kerosene with air. It was found that with radial air supply (without swirl) and the same specific mixture flow rates, even combustion is absent.
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