Residual Gas Condition Analysis And Safety Assessment Of Airborne Gun Compartments

As an important weapon for helicopters and fixed-wing combat aircraft,airborne artillery has an important role to play in future warfare,and ensuring the safety of airborne artillery firing is the primary condition for the effectiveness of combat aircraft.With the advent of advanced airborne weapons,the weapons of contemporary fighter aircraft have changed from external to embedded.Due to the change in mounting method,the buried airborne guns are mounted inside the fuselage,the space inside the cabin is small,and the gun systems with high firing rate are mostly used,the gas generated from the muzzle and the tail of the gun can cause many problems.This paper focuses on improving the safety of airborne gun firing and reducing the concentration of combustible gases in the gun compartment,with the main research content and results as follows:（1）Analysis of the causes of residual gas formation in the gun compartment of airborne artillery.The principle of airborne rotary barrel gun automation and the firing process were analysed,and the causes of residual gas formation in the gun compartment were analysed according to the firing process of airborne rotary barrel gun.（2）Simulation calculation of the gas concentration in the gun compartment.The combustion products of the firing charge are analysed,and the gas composition in the airborne gun compartment is further analysed according to the chemical reaction model and the multi-component thermodynamic relationship,and the concentrations of CO,H₂ and CO₂ in the compartment are monitored.（3）Propose to reduce the gas concentration in the chamber,improve the structure of the gun chamber,and propose a design scheme for ventilation and exhaust devices to enable the gunpowder gas in the chamber to be discharged as soon as possible;design three kinds of rifling devices for reducing the amount of gunpowder gas diffused into the chamber.（4）Simulation of the gas concentration in the gun chamber under the working conditions of each improved solution,comparing the simulation results,it is found that the spherical chamber device has the best effect,which can effectively prevent the powder gas at the chamber from spreading to the gun chamber and greatly reduce the concentration of combustible gas in the chamber.