Erosive Burning of Two-dimensional Packs of AP/binder Solid Propellants Using Shear Model Based on Multiscale Analysis

Abstract

Erosive burning of two-dimensional packs of AP/binder solid propellants as a function of shear amplitude is studied. Significant increase in the average heat flux to the propellant surface and in the average burn rate was observed just as in previous results with a simple quarter-plane geometry. The increase in the surface-averaged heat flux (a volumetric quantity) is due to an increase in the area over which the edge-structure of the reaction rate/diffusion flame is significant. To obtain the shear model used in the erosive burning study, direct simulation of incompressible turbulent flow in a periodic circular pipe with a transpired wall is performed. The model has its roots in a multiscale analysis of a solid rocket motor. It is found that, unlike turbulent flows in a pipe with a non-transpired wall, the near-wall shear is dominated by the rms of the streamwise-velocity for turbulent flows in a pipe with a transpired wall.