Simulation Of Ignition And Internal Ballistic Process Enhanced By Plasma With Mixed Charge

The ignition and combustion process under plasma is a complex process involving multiphase flow,heat transfer,chemical reaction and projectile motion.The interaction between plasma and propellant is the key to electrothermal-chemical launch technology.Changing the plasma incident parameters and charge structure can effectively adjust the combustion performance of propellant,thus improving the internal ballistic parameters and enhancing the weapon power.Based on theoretical research and closed explosion experiment,a twodimensional unsteady simulation model of solid powder constant volume combustion under plasma is established on ANSYS calculation platform.Combined with the discharge characteristics of pulse forming network,the plasma ignition and combustion process under different discharge conditions was simulated.The results show that the increase of injected plasma energy can significantly increase the maximum chamber pressure,shorten the ignition delay time,and improve the ignition consistency and uniformity.The electric power enhancement factor is introduced to modify the formula of propellant burning rate under plasma,and the modified formula is in good agreement with the simulated data.Based on the firing experiment of 30 mm electrothermal-chemical gun,the constant volume combustion model and internal ballistic calculation model considering mixed charge and plasma ignition are established.The influence of the mixed charge structure of conventional and coated propellant on the combustion and internal ballistic properties of propellant is studied.The results show that the coated propellant has the characteristics of delayed combustion,and the appropriate mixing ratio can adjust the gas generation rate and improve the pressure curve of combustion chamber.The influence of the mixed charge structure of conventional and porous propellant is studied.The results show that the mixed charge structure can improve the pressure and projectile velocity curve.In this simulation environment,adding 15%porous propellant can make the projectile obtain the maximum kinetic energy.