Preparation And Burning Rate Control Of A New High Burning Rate Solid Propellant

In order to obtain porous high-burning solid propellants with controllable burning rate,a new preparation method of high burning solid propellants was adopted in this paper.The energetic microporous spheres with controlled porosity was prepared by double base gun propellant in double emulsion method,and the technology of porosity control was studied.The new high burning rate solid propellants with different porosity and curing states were obtained by introducing energetic microporous spheres into AP/HTPB system,and the burning rate test of the new high burning rate solid propellants was carried out under atmospheric pressure and high pressure.The combustion physical model and burning rate estimation of this porous propellant containing energetic microporous spheres are also discussed.The specific research contents and results are as follows:（1）Based on the double emulsion method,the forming technique of low density and high density microporous spheres was explored,gaining some samples with the porosity ranging from 4.9% to 72%.The technological parameters about porosity control,and reducing the number of large holes were summarized.The results show that the porosity increases with the volume of the emulsion increasing,decreases with the increase of the concentration of dehydrating agent.According to the amount of solvent,when the removal rate of solvent is in a appropriate range,the number and aperture of the large hole will decrease.（2）Based on AP/HTPB propellants,microporous spheres with different volumes and different porosity were introduced into the base propellants,and the curing state and charging conditions of the propellants were changed to obtain high burning rate solid propellants with porosity of 0～20.3%.（3）The variation of pressure index with porosity at constant volume when the porosity is between 0 and 2.96% was obtained by closed bomb vessel and.（4）The small rocket engine burning rate experimental results show that when the porosity is 18.5%,the maximum combustion pressure and corresponding average burning rate of the new high burning rate propellant are greatly improved compared with the basic propellant.（5）For this high burning rate solid propellant,a combustion physical model is predicted under reasonable assumptions.