Impact of ignition charge on ignition process of dual-pulse solid rocket motor

In order to find out the impact of ignition charge on ignition process in the second pulse，a model was established.The axisymmetric unsteady Navier-Stokes equation and the standard k-ε turbulence model were used to simulate the second pulse ignition process.Based on that，the impacts of the igniter working duration and ignition gas flow rate on the ignition delay were studied.The results showed that：when the ignition gas flow rate was constant，increasing the igniter working duration can effectively shorten the second pulse ignition delay，and there existed a limit value of the ignition delay，which was defined as the minimum ignition delay.Different ignition gas flow rates corresponded to different minimum ignition delay，and the bigger ignition gas flow rate indicated the smaller minimum ignition delay.The ignition gas flow rate had a negative exponential relationship with the minimum ignition delay.Choosing the free volume as the sum of the first and second pulse free volumes is more reasonable when calculating the second pulse ignition charge.