Research On The Jet Flow Field Of Individual Recoilless Gun Launched In Limited Space

As an infantry shoulder-shooting tube weapon,the individual recoilless gun has the characteristics of low weight,high mobility,simple structure,and convenient operation.It can exert unique advantages in battlefields such as urban warfare,street warfare,and trench warfare.However,when it is launched,the tail nozzle has high-intensity shock waves and high-velocity post-throwing sealing plugs.This may cause damage to the gunner,equipment,and surrounding environment,which is unfavorable to the realization of its limited space launch technology.This paper focuses on improving and enhancing the launch capability of individual recoilless guns in limited space.The main contents are as follows:1.Numerical calculation of the jet flow field of the individual recoilless gun launched in a limited space.Using the method of computational fluid dynamics,combined with the 6DOF dynamic grid technology,the simulation calculation of the tail jet flow field of the individual recoilless gun in a limited space is carried out,and the interaction characteristics between the sealing plug and the gunpowder gas jet are studied.And the development law of jet shock wave in limited space.And compared with the jet flow field when launching in a free field,the characteristics of the jet flow field when launching in a limited space are analyzed.2.Designed and researched the sealing plug at the tail of the individual recoilless gun.The design of the sealing plug of the individual recoilless gun is one of the main contents of the entire weapon system design.It is not only the main solid object of the tail jet,but its related size also directly affects the size of the membrane breaking pressure.In this paper,the design of the sealing plug at the tail of the individual recoilless gun nozzle is carried out,and the thickness(quality)of the sealing plug,the impact of the rupture pressure of the sealing plug on the shock wave of the tail jet and the movement velocity of the sealing plug are studied.3.In-depth research is conducted on the mechanism of individual recoilless guns containing liquid column balance body firing and reducing firing characteristics.Using computational fluid dynamics,combined with the VOF two-phase flow algorithm and 6DOF dynamic grid technology,a simulation model of the jet flow field of the individual recoilless gun gas-liquid-solid mixed launch is established.The interaction characteristics between the gas jet,the liquid column balancer and the sealing plug are analyzed,and the mechanism of reducing the shock wave intensity and the velocity of the sealing plug is deeply studied.The influence of the volume and density of the liquid column balance body on the characteristic parameters of the two-phase flow field,as well as the influence of the jet shock wave intensity and the movement velocity of the sealing plug are discussed.