Numerical Simulation Of Combustion Of The Oxygen And Kerosene In Combustion Chamber

Gas oxygen kerosene is a kind of propellant commonly used in rocket engines,and is widely used in various fields such as aerospace,especially in rocket-based combined cycle(RBCC)propulsion system.The injection parameters of gas oxygen and kerosene(such as half spray angle,mixing ratio,etc.)and the forms of the outer ring injection(outer ring inlet position)have a significant impact on combustion efficiency and combustion stability,Therefore,the study of injection parameters and forms is one of the important ways to optimize the combustion chamber performance of the rocket engine.In order to study the influence of different injection parameters and forms on the combustion field of gas oxygen and kerosene,this paper refers to the literature related to the content of gas oxygen and kerosene combustion,by using numerical simulation methods and the finite-rate-eddy dissipation combustion model,RNG k-? turbulence model and the pressure swirl atomization model to calculate the working conditions in the gas oxygen and kerosene combustor literature,The calculated results are compared with the results in the literature and found to be in good agreement.On this basis,this paper studied the various conditions of the half spray angle,the mixing ratio,swirl number,the ratio of mass flow rate of the outer ring gas,the inlet position of the outer ring gas,and analyzes the variation law of the combustion flow field,thereby the best combustion efficiency under different working conditions is obtained.The calculation results show that if the half spray angle is too large,the combustion flow field will be very uneven,and the smaller half spray angle will lead to insufficient combustion.Therefore,there is an optimum half spray angle to maximize the combustion efficiency.Similarly,the too large or too small mixing ratio will also reduce the combustion efficiency,so there is an optimal mixing ratio to maximize the combustion efficiency;in addition,the increase of the outer epoxy flow path is beneficial to improve the combustion efficiency.Within a certain range,the combustion efficiency gradually decreases with the increase of the external ring flow ratio and gradually increases with the increase of the number of external ring swirls.However,when the number of swirls exceeds a certain value,the influence of the number of external cyclone swirls on the combustion efficiency is gradually reduced.Therefore,the research in this paper has guiding role in mastering the variation law of the combustion flow field in the combustion chamber.