Study Of Combustion Characteristics Of Containing Metal Composite Fuel

The combustion characteristic of containing metal composite fuel was studied in this paper.The intermediate,gas product and solid product were collected from the center of the combustion different distance and height before analyzed.Theoretical calculation was performed for the trapping mechanisms of three different free radical trappers,methylene blue,salicylic acid and tribromophenol by B3LYP hybrid density functional theory in gaussian 03 programme.The results show that tribromophenol had higher reaction energy barrier and heat release,maximum reaction barrier of 32.0 kJ·mol^-1.The barrier can overcome the spontaneous reaction at normal temperatures.Different from tribromophenol,the others underwent addition reaction,not substitution reaction.There was an energy barrier-less reaction channel in the reaction of methylene blue and free radical,with little reaction heat release.There were four reaction channels in the reaction of salicylic acid and free radical,where the reaction barrier was negligible because of easy reaction on ortho and para positions.Experiments were conducted using 50kg composite fuel under outdoor conditions.The reaction intermediate free radicals were detected by ICCD,infrared spectroscopy,etc.It was found that at an elevated pressure,ALO free radicals were more easily produced than other free radicals and the intensity of the characteristic peak of NH free radical at548 nm did not change basically,i.e.NH free radicals was not affected by pressure.The intensity of the characteristic peak of CH free radical significantly changed.HF free radical was affected the most by pressure,and did not change at 0.2Mpa without signal.The combustion product was analyzed using SEM,EDS,ICP-AES,and F-selective electrode.It was found that Ag in composite fuel mainly existed in the product in the initial production,and was not involved in a series of subsequent pyrolysis reactions.Mo constantly and stably reduced in the entire distance detection phase,and was involved in reaction in the detection phase.Al content in the initial product rapidly reduced,and reduced after 2m,and then slowly reduced.Al mainly reacted very rapidly in the initial reaction.The content of Ni element was lower than other elements at 3m,only 0.8940 mg/L,and slowly reduced after 3 m.The distribution of HF was determined during combustion process composite material.