Study On The Scheme Design And Dynamic Behavior Of External Combustion Gasbag Type Dispersion System With Single Gas Source

Airborne dispersal weapon is an advanced air-to-ground attacking weapon developed on the basis of cluster bombs.This weapon system has been widely used in many countries since the Gulf War because of its wide depth,large area and multi-target attacking capability.However,at present,most of the bullets in the same launch capsule of the weapon system are dispersed at the same initial velocity.With the continuous application of modern science and technology in military weapons,the types of bullets gradually increase,and different types of bullets have different requirements for the initial dispersing velocity.If the original dispersing technology wants to realize that the bullets in the same launch capsule are dispersed at different initial dispersing velocity,it needs to adopt multiple releasing cartridges.This dispersal structure design is complex,the cost is high,and there will be a problem of inconsistent ignition,which can’t meet the needs of modern war.In order to satisfy the technical requirement that bullets in the same launch capsule are dispersed at different initial velocity,an external combustion gasbag type dispenser with single gas source was designed.The distribution on demand of gas was realized by introducing gas distributor and the dispersal structure of adopting multiple releasing cartridges was simplified to adopt one releasing cartridge.The problem of inconsistent ignition was solved.The design of dispersal structure mainly includes the structural design of releasing cartridge and powder charge,the structural design of gas distributor,the structural design of gasbag and bullet,and the structural design of cluster munitions frame and bomb hoop.The mathematical model was established based on combustion,interior ballistics and aerodynamics.Aiming at the study objective and technical index of this paper,the optimal combination scheme of the dispersing parameters in the external combustion gasbag type dispenser with single gas source was proposed.The whole process was divided into three stages under reasonable assumptions.That was,the stage of gunpowder burned at the constant volume,the stage of gasbag inflation at constant volume and the gasbag expanded to push the bullet movement stage.The internal ballistic dynamics was analyzed theoretically and the corresponding mathematical equations were established.The fourth order Runge-Kutta method was used to calculate the established mathematical equations,and the effects of the charge quantity,the rupture strength of the bomb hoop,the diameter of the gasbag vent and the size of the gasbag on the dispersing performance were studied.The accuracy of the designed external combustion dispersal structure with single gas source and simulation calculation were verified by the ground dispersing test and high altitude dispersing test.The experimental results showed that the study goal that the bullets with different sequences in the same launch capsule were dispersed at different initial dispersing velocity was realized by designed dispersal structure.It not only simplified the structure design of the original dispersing system but also solved the problem of inconsistent ignition.The results of simulation were corresponded to the experiment.It was shown that the mathematical model of interior ballistic dynamics established in this paper was correct and effective,and the mathematical model and calculation method can be widely used in the simulation calculation of other dispersing structures using gas distributor.