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US 10,570,069 B2Granted
End-burning propellant grain with area-enhanced burning surface
AssigneeAerojet Rocketdyne, Inc.
InventorsScott K. Dawley, Mark Peyser Friedlander
Life of this patent
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Abstract
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.
Claims13
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 bum 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 high-nitrogen burning rate modifier is selected from triamonoguanidium azotetrazolate (TAGzT), guanidinum azotetrazolate (GUzT), 1, 1-diamino-2,2-nitroethane (FOX-7), 3,3′-diamino-4,4′-azoxyfurazan (DAAF), and 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105),
- said ballistic control propellant having a ballistic control propellant bum rate that is substantially greater than said matrix propellant bum rate,
- said rod terminating at said ignition end of said grain, wherein the matrix propellant and the ballistic control propellants are solid propellants.
1 more element
Dependencies are inferred from the claim text.