Modeling and Simulation of Interior Ballistics Considering Heat Loss in Chamber

Focusing on the problem that the heat loss in interior ballistics could not be estimated exactly,a method of calculating the heat transfer of propellant gas in chamber was proposed on the basis of closed bomb tests.The function of heat transfer between propellant gas and the chamber was established according to the relationship between work capacity and pressure of propellant gas in closed environment and the pressure and time signals measured in closed bomb tests.Combining the function with interior ballistics equations,an interior ballistics model to estimate the interior ballistics performance which considered the heat loss in chamber was obtained.Then the model was validated by gun firing with sf-3 propellant.Comparison between the results of simulation and experiments,the results show that the errors both of maximum pressure and velocity are less than 2.5%,which indicates the model is effective and excellent to estimate the interior ballistics performance.