Experimental Study On The Deflagration Characteristics Of RP-3 Aviation Kerosene

In order to explore the influence factors of combustion characteristics of RP-3 aviation kerosene further,a vertical shock tube was used to measure the critical detonation energy of aviation kerosene cloud at different concentrations.The detonation velocity and explosion pressure of aviation kerosene were also measured under the different conditions of spray pressure,ignition delay time,initiation energy,and equivalence ratio.And the explosive pressure and explosion limit of kerosene vapour were measured in a horizontal shock tube at different volatilization temperature or initial ambient temperatures.The main conclusions are as follows:The detonation velocity and explosion pressure are both invert "U" shapes along with the changing of the spray pressure or ignition delay time at the same concentration.The detonation velocity and explosion pressure of the fuel have a linear ascending tendency with the increase of initiation energy.And when the initiation energy is in the range from 0.37 MJ/m2 to 1.68 MJ/m2,the aviation kerosene can not reach the state of detonation.The detonation velocity and explosion pressure of the fuel first increase and then decrease along with the rising of the equivalence ratio.And their trends are both invert "Uf" shapes.The critical initiation energy of kerosene first decreases sharply and then rises slowly with the increase of equivalence ratio.And the changing trends of the fuel are basically like the shape of "L".When the initial ambient temperatures are on the range of 60 ℃ to 150℃,the explosion overpressure of kerosene vapour almost reduce linearly with the ambient temperature increasing.And the explosion reaction rates are gradually accelerated with the increase of ambient temperature.The explosion pressure of kerosene vapour whose concentration is 3%rises almost linearly with the increase of evaporation temperature.The explosion pressure of kerosene vapour whose concentration is 4%rises gently before 90 ℃,and increases dramatically in the range of 90 ℃ to 120 ℃.The explosion pressure of kerosene vapour whose concentration is 5%remains unchanged basically before 90℃.And when the range is 90℃ to 120℃,it declines obviously.The explosion pressure of kerosene vapour whose concentration is 6%or 7%shows a small fall with the increase of volatile temperature.The LEL of kerosene vapour decreases from 2.75%to 2.25%with the increase of environment temperature from 60 ℃ to 90℃,and remains unchanged basically outside the range of 30℃ to 90℃.The UEL rises from 9.25%to 10.25%with the increase of initial ambient temperature from 60 ℃ to 120℃.And it is almost the same in the heating process from 120℃ to 150℃.The LEL of kerosene vapour is fundamentally the same when the volatilization temperature is within the range of 30 ℃ to 90 ℃.And the LEL reduces from 2.25%to 1.75%when the volatilization temperature continues to rise from 90℃ to 120℃.The UEL is constant in the range of 30℃ to 60℃.And it continue to decrease from 10.25%to 9.25%gradually with the rise of volatilization temperature from 60 ℃ to 120℃.