End-burning propellant grain with area-enhanced burning surface

摘要

An end-burning grain of a solid rocket motor or other gas-generating device is supplemented with one or more sticks of high-burn-rate propellant embedded in a matrix of a relatively low-burn-rate propellant. The sticks increase the burning surface area as the grain burns by forming conical indentations in the surface.

主权项

1. An end-burning grain of a solid gas-generating composition, said grain having an ignition end and a longitudinal axis, said grain comprising:
a matrix propellant having a matrix propellant burn rate, wherein said matrix propellant is devoid of metallic fuels and halogen-containing, additives, and a rod of ballistic control propellant embedded in said matrix propellant, wherein said ballistic control propellant comprises nitrocellulose an energetic plasticizer, and a high-nitrogen burning rate modifier and is devoid of ammonium perchlorate, wherein the ballistic control propellant and the matrix propellant are devoid of metallic ballistic modifiers, said ballistic control propellant having a ballistic control propellant burn rate that is substantially greater than said matrix propellant burn rate, said rod terminating at said ignition end of said grain, wherein the matrix propellant and the ballistic control propellants are solid propellants.