Study on Combustion Theory of Kerosene Droplets in Sub/supercritical Environments
When a high thrust liquid oxygen kerosene rocket engine operates stably,the combustion chamber reaches a supercritical environment.However,the existing droplet evaporation combustion model at present is only applicable to subcritical environments,and cannot be used in supercritical environments.In view of this,in this paper,a simulation calculation model is established for kerosene droplet combustion in sub/supercritical environments,and the effects of the ambient parameters on the combustion characteristics of kerosene droplets in sub/supercritical environments are studied.The results show that as the ambient temperature increases,the flame temperature increases significantly,and the ignition time,migration time,and droplet life all decrease.Besides,when the ambient pressure increases,the dimensionless flame radius of kerosene droplet combustion decreases,the flame temperature slightly increases,and the ignition time,migration time,and droplet life all decrease.In a pressure oscillation environment,the oscillation frequencies of the time dependent curves of the droplet evaporation rate,dimensionless flame radius,and flame temperature of kerosene droplet combustion are consistent with the oscillation frequencies of the ambient pressure,and the flame temperature is particularly sensitive to the ambient pressure oscillation.
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