Plasma Excitation Aviation Kerosene Surrogate Fuel Mechanism And Combustion Simulation

As the "heart" of the aircraft,aero engines need to work stably in a variety of harsh working environments.However,as the flight altitude increases and the flight speed increases,it becomes more and more difficult to maintain stable combustion.Non-equilibrium plasma has the characteristics of being able to introduce highly active particles into the reaction system,increase reaction activity,increase ignition energy,and improve flow.Plasma-based combustion optimization has also made plasma a new hot spot in the field of aviation engine combustion.Many scholars at home and abroad have studied the chemical reaction kinetics of plasma excited aviation kerosene.In this paper,the skeletal mechanism of n-decane is selected as an surrogate fuel for aviation kerosene,and the non-equilibrium plasma combustion-supporting effect is studied from the perspective of chemical reaction kinetics.The zero-dimensional homogeneous complete mixing model and zero-dimensional complete premixing model are used to calculate and analyze the plasma ignition process,and the effect of active particles（H,OH,O3）in the plasma on the ignition characteristics of aviation kerosene surrogate fuel is studied.By calculating the sensitivity and the mole fraction of each component,the influence of the addition of active particles on the reaction mechanism was revealed,and the reaction mechanism was appropriately corrected by the sensitivity analysis method.By analyzing the change of ignition delay time with temperature,it is found that after the active particles are added,the ignition delay time shows different degrees of decline,and as the concentration of active particles increases,the degree of decrease increases.Under the conditions of 0.1MPa and 1400K,adding 0.5%of H、OH、O3 radicals respectively,the ignition delay time decreased by 71.7%,41.0%and 53.2%.In the high temperature area,H radicals have the best effect,followed by O3,and finally OH.radicals.The sensitivity results show that the addition of active particles significantly strengthens the effect of each reaction formula on the ignition delay time of n-decane,and the sensitivity increases in the direction of promoting the reaction.Comparing the mole fraction of each component at the end of the reaction at different initial temperatures,it is found that the addition of active particles can reduce the minimum ignition temperature.