密实装药床内燃气射流对发射药药粒运动特性影响OA

For the spherical propellant particles in the main charge room of a certain 105 mm large-caliber artillery,the motion characteristics of the spherical propellant particles after the gas jet produced by the metal center ignite tube entering the main load room was studied.A simplified ignition test platform for dense propellant room was constructed,and the final state of the propellant particles heap room under the test conditions(gas jet mass flow rate ṁ=30 kg/s)was obtained.Based on the dense load ignition test platform,a computational model of the dense load room was established,and particle phase and fluid phase information were obtained using EDEM software and Fluent software,respectively.The influence between the particle phase and the fluid phase was calculated through the CFD-DEM coupling interface,which served as an information exchange channel.To research the effect of the mass flow rate of the gas jet on the motion characteristics of the propellant particles,two mass-flow-rates(ṁ=25 kg/s,ṁ=35 kg/s)were selected.Simulation calculations were performed to obtain the final state of the propellant particles heap morphology and the velocity distribution at four moments(t=0.15,1,2,5 ms)under the two conditions.Comparing the simulation results with the test conditions,the final state of the propellant particles heap morphology exhibits three variations:the height of the bottom of the heap room is different,the order of the heights of the two sloped heaps at the front and back is different,and the starting position of the horizontal heap is different.Comparing the velocity distributions at four different times,the propellant particles acquire less velocity under conditions with lower mass flow rates,and the rate of change of the load room morphology is slower,thereby affecting the final shape of the load room.