Research on Internal Nozzle Growth Efficiency of Combustion Light Gas Gun Based on FLUENT
In order to study the effects of the internal nozzle at the front of the combustion light gas gun chamber on projectile velocity and gas flow,the basic governing equation of gas flow in the 35mm light gas gun chamber and the one-dimensional numerical model of nozzle flow were established by using computational fluid dynamics(CFD)method,and the UDF function was compiled in Fluent to calculate the motion parameters of the projectile.The influence of the internal nozzle on the airflow velocity,direction vector and the velocity curve of the projectile were analyzed,and the growth efficiency of the internal nozzle was compared according to the difference of the internal nozzle.The results show that the internal nozzle configuration is beneficial to increase the flow velocity after the projectile,reduce the gas backflow,and the flow velocity can be increased to 1.76Mach,with an increase of about 9.3％.When the combustion temperature and pressure are high(＞12MPa),the projectile speed can be greatly improved,and the maximum speed is about 670m/s,with an increase of about 6％to 10％,whereas the projectile speed efficiency is weak(an increase of 2％to 7％).The results show that the combustion light gas gun with built-in nozzle has the effect of improving the firing performance,which can provide a theoretical reference for the optimization of the firing performance of the gas gun.
Combustion light gas gunInternal trajectory calculationGas gun optimizationRocket nozzle
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