Numerical Simulation Of Gas Flow In Inner Perforation Of Partially-cut Stick Propellants

The partially-cut multi-perforated stick propellant is widely used in large caliber artillery because of its high loading density and progressive combustibility.The existence of cuts is beneficial to reduce erosive burning of stick propellants.The model of gas flow in inner perforation of partially-cut stick propellant is established in this paper.The CFD software Fluent is adopted to simulate the flow model has been established,then the results of numerical calculation are analyzed and discussed.Numerical simulations of gas flow under the consideration of chemical reaction and none at the inlet of inner perforation are carried out,which is to explore the influence of gas component change on the gas flow in inner perforation.The cut parameters which include cut spacing and width may have an influence on the gas flow in inner perforation,so the control variable method is used to explore the influence of cut parameters.The numerical simulations are carried out under the same initial boundary conditions.The results of numerical simulation show that there is no obvious difference of gas flow in inner perforation for different component of gas,which indicates that the different component of gas with similar physical parameters has little effect on the gas flow inside the perforation.The synclastic cut interval has an important effect on gas flow in inner perforation,the smaller distance between the synclastic cut is beneficial to reduce the time it takes to achieve a steady condition,which is good for the inhibition of erosive burning.While the incongruous cut interval has no significant influence on gas flow in inner perforation.When the cut width increases,the time needed to reach a steady state for the gas flow inside the perforation is shortened and the erosive burning of inner perforation has been reduced.