Study On Shock Ignition Mechanism Of 98wt% Hydrogen Peroxide Based On Optical Transparency And Light Radiation Method

The physicochemical behavior of 98wt% hydrogen peroxide in the delay period under shock wave loading was studied by using the optical transparency in-situ detection system,and the variation of transmissivity with time during the delay period was discussed.When the shock pressure in 98wt% hydrogen peroxide reaches the critical ignition pressure,hydrogen peroxide enters the delay period first.In the delay period,some new scattering are formatted in the hydrogen peroxide.By these gradually growing scattering,the original homogeneous 98wt% hydrogen peroxide transforms into a heterogeneous state.For the ignition,the role of such scattering may be similar with that of hot spots in heterogeneous explosives,which as an energy reserve.The experiments show that the duration of the delay period of 98wt% hydrogen peroxide is related to the pressure.With the increase of the pressure,the delay period is shorted.When the pressure reaches the critical value,the energy is high enough to instantaneously excite 98wt% hydrogen peroxide to reach the ignition conditions.At this time,98wt% hydrogen peroxide can detonate directly without the delay period.The change law of transmissivity in 98wt% hydrogen peroxide after ignition is analyzed.It is found that the transmissivity is related to both consumption and formation of scattering.This phenomenon proves once again the rationality of the opinion that the generation of scattering is an energy preparation stage for ignition.The experimental results show that the critical pressure of transmissivity change of 98wt% hydrogen peroxide is between9.3-12.1GPa,which is consistent with other work.The coincidence shows that a new test method for determining the ignition pressure of energetic material are provided in this work.In order to explore the radiation characteristics of 98wt% hydrogen peroxide under shock loading,a new experimental scheme was designed,by which the chemical reaction character of 98wt% hydrogen peroxide before and after ignition was detected.It is found that the light radiation intensity of 98wt% hydrogen peroxide increases in the delay period.It indicates that there is a chemical reaction in the delay period which provides energy for the subsequent ignition behavior.It is speculated that the formation of scattering may come from the chemical products under shock loading.The light radiation intensity of98wt% hydrogen peroxide decreases in later stage during the detonation may due to the common effect of the transparency decreases of hydrogen peroxide and the reverse suppression of detonation wave.