Solid propellant burning along a tube heated by combustion gas influx

A Feasibility Study of Command Control of Solid Propellant Burning Rate

“…The porous aluminum element was selected because data in Ref. 37 can be used to approximate burning rate as a function of gas flow rate into the porous element. The data in Ref.…”

“…The data in Ref. 37 are for burning rate enhancements that result from hot combustion gases flowing through thin wall aluminum tubes. These data were correlated by expressing the burning rate enhancement ratios, rt/rto, in terms of the mass flow rate of combustion gas per unit cross-sectional area of the metal tube wall, i'/7r (Dit +Tw) 7 w. *In an end-burning motor with a single nozzle, the gas flow results in small.…”