Abstract
Research on the application of liquid fuels to continuously rotating detonation was conducted. A new method of mixture preparation was proposed. A special system of liquid fuel injection was designed and tested which is based on injecting into the detonation chamber a preheated liquid fuel partially mixed with hot air at conditions higher than the rich flammability limit. The specially selected conditions allow all liquid fuel to evaporate in the supply system but prevent it from ignition before entering the detonation chamber. Experiments were conducted for two different liquid fuels, extraction gasoline and Jet-A fuel. Research was carried out for different equivalence ratios, and in all tested conditions detonation was achieved. The new tested method of liquid fuel preparation and injection into a cylindrical detonation chamber opens a way of application of liquid fuels to engines which utilize continuously rotating detonation and thus prepares the way for practical application of detonative combustion to turbine engines and jet propulsion systems.
Highlights
The most important development needed for successful application of continuously rotating detonation to propulsion systems is to achieve operation of such engines with liquid jet fuels
Experiments were conducted in an adapted annular detonation chamber used in previous studies [6] with a newly designed fuel supply and injection system, in which fuel was evaporated and mixed with hot air
The observed drift of the pressure signal during 4-s operation time is due to the heating of the Kistler pressure transducer. For this reason a longer period of cooling the detonation chamber between successive experiments must be maintained in order to allow the pressure transducer to cool down
Summary
The most important development needed for successful application of continuously rotating detonation to propulsion systems is to achieve operation of such engines with liquid jet fuels. All these conditions are very difficult to fulfill, and up to now successful, stable continuously rotating detonation in an annular chamber for atmospheric conditions of jet fuel–air mixtures has not been achieved.
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