Overpressure Flow Field Research And Adaptive Optimization Of Structure Of Muzzle Brake Of The Gatling Weapon

Nowadays,with the development of weapon system’s diversification,multidimensional and attack saturation,the performance of short-range defense weapon system is required to be higher.The high-speed and ultra-high-speed Gatling gun has fast firing speed and compact overall structure,and is mainly used as the terminal defense weapon of air defense and antimissile.At present,the development trend of weapon requires that the Gatling gun has better installation adaptability in different weapon platforms,and its control performance of system recoil and overpressure flow field in muzzle area is facing more severe challenges.The research shows that the development and change of the muzzle overpressure flow field will greatly change the force on the muzzle brake,which will have an impact on the muzzle stability and recoil characteristics.Based on the system structure and working condition of the Gatling weapon,this paper analyzed the key problems of the muzzle overpressure flow field of the Gatling weapon system from the point of view of enhancing the lightweight degree and installation adaptability of the Gatling weapon,in order to obtain the structural scheme of the muzzle brake with balanced performance.In this paper,numerical studies of the law and development mechanism of flow solid interaction in the overpressure flow field of the muzzle are made.And the adaptive design of the muzzle brake’s structure scheme is completed based on above research results and the design requirements of the launch system of the Gatling weapon.Finally,through the analysis of muzzle stability and numerical simulation of muzzle flow field,the structural scheme is evaluated and optimized.The main research contents are as follows:(1)According to the key structure of the firing system and the change of the flow field in the work,this paper simplified the complex muzzle flow field of the Gatling weapon system,and analyzed the development and characteristics of the muzzle flow field of the Gatling gun.Based on the interaction mechanism of the muzzle flow field,the interaction between the impact flow field and the solid wall caused by the simultaneous firing of single barrel and double barrel are studied theoretically.(2)The theory and method of numerical simulation of muzzle flow field are studied,and then four different characteristic structures are separated according to the structural characteristics and functions of typical muzzle brake.The mechanism and influence rules of different characteristic structures on the impact flow field are analyzed in detail from the moving direction and overpressure distribution of flow field and the force of flow field on wall.Then the applicability of different structure schemes of the brake in the Gatling weapon system are studied,and the influence of the coupled overpressure flow field on the outer wall of the barrel group of the launch system of Gatling weapon is obtained.(3)Based on the working principle of the Gatling gun and the action mechanism of the overpressure flow field at the muzzle,and combined with the actual structural characteristics of the launch system of Gatling weapon,the adaptive design of the muzzle brake’s structural scheme is carried out according to the research route of "the overall scheme first,then the local structure and the key structure last".The effects of different brake structures on the overpressure flow field in muzzle area are studied.Finally,it is found that the most suitable layout of the muzzle brake for the launch system of the Gatling gun is Integrated or combined.(4)The performance evaluation indexes of the brake are analyzed,and the muzzle stability,the brake efficiency and overpressure are selected as the evaluation indexes of muzzle brakes.The structural scheme which has less influence on the muzzle stability of launch system of Gatling weapon is determined by dynamic analysis.Then from the point of view of the overpressure distribution of the impact flow field and the stress of the structure,the performance of the brakes with different structural parameters is evaluated by the orthogonal test method and the numerical simulation of the muzzle flow field,and the optimal combination scheme within the parameter range is found.Through the above research,it is clear that the baffle and side hole of the muzzle brake can increase its efficiency by changing the flow field movement,but also enhance the overpressure value behind the muzzle.The structural scheme of muzzle brake which applicable to launch system of Gatling weapon is the brake with passive type,its side holes are symmetrically arranged,its characteristic structure only includes blow holes,and its installation mode is to directly process the side holes at the muzzle end of the barrel.Finally,the efficiency and the distribution of overpressure in the impact flow field of the designed structure are analyzed by numerical simulation,and the results are in accordance with the design requirements.The relevant research shows that the brake can balance the brake efficiency and the overpressure distribution of the flow field by modifying its own structure,which proves that the brake has a high potential to control the recoil of the launch system of Gatling weapon,and provides a reference for the follow-up research in the relevant mechanism of overpressure flow field,engineering structure design,etc.