Analysis Of Combustion Characteristics Of Aviation Kerosene Based On Visualization

Aviation kerosene is not only suitable for its density,high calorific value and good combustion performance,but also has good low temperature fluidity.It is suitable for the use of special vehicles in cold and low temperature areas and military large UAV and reconnaissance aircraft at high altitude.The thermal stability and antioxidation stability are good for storage and transportation,and the cleanliness is high,and there is no aircraft in aviation kerosene.In recent years,scholars in various countries have paid more attention to applying it to the piston engine,so as to solve the problems of the military large UAV,the reconnaissance aircraft and the special vehicles to combat the unified fuel in the combat and the plateau cold.The problem of the cold start of the vehicle engine in the area is difficult.Based on the visual-test bench,the combustion experiments of RP-3 aviation kerosene are carried out in a fixed volume combustion bomb by changing ambient temperature,injection pressure,back pressure,and oxygen concentration.Through the analysis of the development history of the RP-3 aviation kerosene flame,the period of ignition,the area of flame,the length of flame floating and the total luminous intensity and so on.To study the combustion characteristics of RP-3 aviation kerosene under different conditions.The results show that the higher the environment temperature,the shorter the ignition delay,the shorter the flame floating length,the more diffusion combustion,the more carbon smoke production,the better fuel atomization and the delay period.When the injection pressure increased to 120 MPa and 160 MPa,the flame area and total luminescence intensity of RP-3 kerosene increased;with the rise of the back pressure,the lag period became shorter,the flame floating length of the initial fire nucleus was reduced,the area of flame and the total intensity of luminescence increased to a certain extent;and the concentration of oxygen in the ambient gas was in a certain degree.When the fuel lag period increases at a lower level,the longer the flame floating length is at the stable fire core,the greater the length of the flame floating,the better the mixing effect when the fuel is burned,the less the production of carbon smoke,the less heat lost by the heat transfer and radiation;the delay time of the RP-3 aero kerosene is greater than that of the 0# diesel under different working conditions.The injection pressure has the smallest effect on the delay period;the ignition position of the oil beam is located below the injection hole,but the specific position has a certain randomness.After the formation of the stable fire core,the flame will have a certain return,and then develop in the direction of the movement of the oil beam;the flame position of the stable fire nucleus is closely related to the delay period,and the lag ignition is delayed.The longer the period is,the larger the flame floating length is when the initial core is formed;the flame floating length of RP-3 aviation kerosene is greater than that of 0# diesel under the same working condition;the area of RP-3 aviation kerosene flame is in a single peak distribution,and the peak time reaches about 2.5ms under different working conditions,but the difference of the peak value is larger;the ambient temperature is opposite to the fire.The area of flame area has great influence.With the increase of temperature,the flame area of RP-3 aviation kerosene flame is more than that of 0# diesel.The total intensity of luminous intensity of RP-3 kerosene combustion is a single peak distribution,which increases first and then decreases,but the peak value is less than that of 0# diesel.