Numerical Simulation Study Of Plasma Ignition And Interior Ballistic Process

As a new concept weapon,Electrothermal chemical gun(ETCG)can not only replace traditional artillery for long-range fire support,but also can be used as a short-range defensive combat weapon such as ground-based air defense,anti-armor and anti-missile on ships and vehicles.It has broad application prospects.Electrothermal chemical launch is a new type of technology.The high-energy plasma is generated through the pulse-forming network(PFN)discharge,which injects into the combustion chamber at the appropriate time to improve the internal ballistics performance of the propellant.The plasma ignition and enhanced propellant combustion process always has been the focus of research on electrothermal chemical launch technology.In this paper,the numerical simulation method is used to calculate and analyze the ignition and internal ballistics processes under the action of plasma.The comparison of plasma ignition and conventional ignition is analyzed.The main work is as following:(1)The internal ballistics process of electrothermal chemical gun and the interaction mechanism between plasma and propellant is analyzed,The results show that the plasma can significantly increase the initial ignition velocity of propellant and greatly shorten the ignition delay time,thus improving the internal ballistics performance.(2)Based on the classical internal ballistics theory and modeling of pulse forming network discharge,the internal ballistics calculations were carried out for the conventional launch and electrothermal chemical launch of 57 mm anti-aircraft guns by MATLAB software,The calculated results are consistent with a large number of experimental facts.(3)By changing the charging voltages and capacitance of the pulse forming network,the influence of PFN parameters on the internal ballistics performance on the electrothermal chemical launch is analyzed.The results show that with the increase of charging voltage and capacitor,discharge power increases gradually,The plasma produced gradually increases,which enhances the combustion of propellant and improves the ballistics performance.(4)The simulation model of plasma ignition process is established by using CFD software,and the plasma ignition characteristics are analyzed comprehensively by comparing with the results of conventional ignition calculation.The results show that compared with conventional ignition,plasma ignition has good uniformity and can obviously reduce ignition delay.