Simulation Of The Two-Phase Flow In The Constant Volume Of Center-Blast Dispersal With Large Length-Diameter Ratio

The bullet dispersal process directly affects the initial motion of bullets,its very important to the realization of the shrapnel tactical index.The center-blast dispersal is more commonly used in a dispersion way,its simple,reliable action,throwing high speed,can make the inside and outside of the bullet with a certain speed gradient of the order out.The center-blast dispersal system in the constant volume along with the complex physical and chemical changes,including ignition and powder burning,its plays a vital role in the dispersal process.This dissertation focuses on the interior ballistic process of center-blast dispersal and studies large length-diameter ratio and no powder ignition mechanism,center-blast dispersal system in the constant volume,through a combination of means such as theoretical analysis,numerical simulation and experiment.The main works were as follows.1.According to the characteristics of ignition tube with no powder and large length-diameter ratio developed the one-dimensional pure gas phase model and programmed by CE/SE method.By numerical calculation,the variation law of the parameters such as pressure and phase velocity in the tube is obtained.According to the test results,the ignition mechanism of ignition tube with no powder and large length-diameter ratio is analyzed.2.The center-blast dispersal system in the constant volume along with the complex physical and chemical changes,including ignition and powder burning.According to the characteristics of these processes,developed the one-dimensional gas-phase model and two-dimensional two-phase model used for the igniter tube and center tube.The coupling function of two tubes is established through the energy exchange.Using CE/SE method to write the calculation program.According to the pressure,gas phase and solid phase velocity and other physical quantity calculation,analyzed the change law of flow field in constant volume phase center tube.3.The mechanism of ignition is very important for the ignition and combustion of the powder.Through the simulation,the influence of the internal diameter of the igniter tube and the powder charge on the ignition process was analyzed,it provided the reference for the design of igniter tube with no powder and large length-diameter ratio.And the influence of the powder charge for the constant volume of interior ballistic process,provided the reference for the design of center-blast dispersal system.