Numerical Simulation on the Ignition Characteristics of the Inner Hole Surface of Perforated Propellant Grains

Abstract

The flow and heat transfer process of ignition flame in the inner hole of perforated propellant grains as well as the ignition characteristics of its inner surface are studied in this paper. An unsteady one-dimensional flow model of ignition flame in the micro-perforated inner hole was proposed according to the physical model of flow. Meanwhile, by the considering the convection and radiation between ignition flame and the inner surface of propellant, a transient one-dimensional model of heat transfer was derived. The flow process of ignition flame in the hole as well as heat transfer process between flame and inner surface is simulated by appropriate scheme. The variation and distribution of inner surface temperature as well as the temperature, pressure and velocity of ignition flame are illustrated and analyzed. The numerical results indicated that the ignition of the inner surface of propellant grains does not occur at the same time, the non-simultaneous ignition of the propellant surface will change the combustion properties of propellant.