Research On Ignition And Erosive-burning Characteristics Of Propellant's Inner Hole

The real ignition and combustion characteristics of propellant affect the interior ballistic performance greatly.Also,they decide the application prospect of propellant in modern weapons.Based on this background,numerical simulation is carried out for the ignition and erosive-burning of propellant's inner hole.The main research contents are as follows:(1)The combustion process of ignition composition is simulated under the condition of constant volume.During combustion process the variation of average temperature,pressure and density is obtained to provide boundary conditions for simulating the combustion process of propellant.(2)The ignition gas's flowing process in propellant's inner hole is simulated by FLUENT and the distribution and variation of flowing properties including pressure,temperature,velocity,density are gained during calculation.Considering convective and radiation heat transfer,the heat transfer between ignition gas and inner hole as well as the heat conduction in propellant are simulated.The distribution and variation of wall temperature are obtained through the calculation.Simulation results show that the orifice reaches ignition point firstly at 3.7ms and half of the inner hole is ignited at 4.4ms.(3)The combustion process of propellant's inner hole as well as the flowing process of combustion gas are simulated through FLUENT.The distribution and variation of combustion gas's flowing properties including pressure,temperature,velocity,density are obtained during calculation.The erosive-burning phenomenon of propellant's inner hole is simulated with the help of UDF.Erosive-burning phenomenon is observed and calculation results show that the erosive-burning phenomenon of propellant's inner hole becomes more and more obvious over time.