含能粉体材料声共振混合过程及机理研究OA北大核心CSTPCD

Energetic powder materials are sensitive in the process of mixing,which requires high intrinsic safety of the mixing device.The resonant acoustic mixing(RAM)features rapid fluidization and homogeneous,efficient,and safe mixing,but the solid-solid particle mixing mechanism is still unclear.Aiming at the problem of solid-solid particle interaction in the process of acoustic resonance mixing of energetic powder materials,the particle flow mechanism under the action of force field and the microfluidic effect under the action of sound field were analyzed.The Hertz-Mindlin(no slip)model based on the discrete element simulation(EDEM)was used to simulate and analyze the motion state and energy state of KNO3 and B powder with 15%filling rate under dif-ferent vertical accelerations,and the corresponding orthogonal experiment was designed to verify the application.The results show that the average force between particles and the average energy of a single particle are positively correlated with the particle size,which is consistent with the theoretical derivation results that the smaller the particle diameter is,the greater the acoustic radiation force and the micro-flow field force are in a certain size range.The results of orthogonal experiment verify that the RAM ignition charge has better product performance and nearly five times the mixing efficiency than the traditional mixed equipment.