Research On Ignition Performance Of Ignition Light Gun And Scheme Design Of Ignition

The combustion light gas gun (CLGG) is a kind of new concept artillery, which makes use of the combustion of the light gas to propel the projectile forward. As a result of light gases, the pressure difference between the bottom of the projectile and the chamber is reduced, a larger muzzle velocity can be obtained when the barrel is longer. Compared with the traditional gun, there are also many key technologies, such as the sealing of projectile in the bore slope, the supply of propellant in the low temperature with liquid or near liquid state, ignition technology, the control of combustion and pressure fluctuation.Based on a project, some research of the ignition on the interior ballistics of CLGG was done and the scheme of the ignition device was designed in the thesis. Based on the computational fluid dynamics CFX software, the 45 mm CLGG simulation model was built, the muzzle velocity, the change regularity of the propellant temperature, chamber pressure and the heat transfer coefficient of the ignition device wall surface in the interior ballistic process and aftereffect period were obtained. Compared with the experimental results, the feasibility of the model is verified, then the impact of ignition on internal ballistics was simulated by changing the ignition parameters.The structure scheme of the ignition device was designed according to the model released by the UTRON company, the capacitor discharge circuit and the DC booster were designed and simulated, the simulation results can satisfy the requirement of use. The simplified finite element model of the ignition structure was built, the thermo-mechanical coupling analysis was simulated in the continuous shooting situation.Simulation showed that the reasonable ignition structure and capacitor discharge circuit could meet the requirement and control the pressure fluctuation. The chamber pressure and thermal stress had greater impact on the ignition structure. The analysis could provide some reference for the ignition characteristics, the design of the ignition device and the experiment.