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US 2016/0009607 A1Published application
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.
Claims3
1-17. (canceled)
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,
- 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.
1 more element
The end-burning grain of claim 1 wherein said rod is substantially parallel to said longitudinal axis.
Dependencies are inferred from the claim text.