Variable mass flow rate solid propellant grain

Details Variable mass flow rate solid propellant grain Variable mass flow rate solid propellant grain

1987-06-12

1989-08-15

Casaregola, Louis J.

Power plants

Reaction motor

Plural propellants to burn sequentially

60254, 102287, F02K 908, F02K 912

Patent

active

048562769

ABSTRACT:
A solid propellant grain for a gas generator such as a missile canister erection actuator. The grain provides a sustain phase followed by a boost phase which may then be followed by another sustain phase. The aft portion of the grain may have the configuration of an end burner to provide the initial sustain phase. The middle portion contains a longitudinally extending cavity in which is disposed a plug for supporting the grain during the initial sustain phase against collapse or cracking. A gap is provided between the plug and the wall of the cavity to provide effective propellant burnign surface area along the cavity wall for the boost phase. The cavity and plug, which terminate at the aft portion, may extend longitudinally through the forward portion of the grain. In order to provide another sustain phase after the boost phase, an insulating inhibitor material is disposed between the plug and the propellant material in the forward portion and is bonded to the propellant material so that the forward portion of the grain becomes an end burner.

REFERENCES:
patent: 3128600 (1964-04-01), Oldham
patent: 3427805 (1969-02-01), Osburn
patent: 3430445 (1969-03-01), Smith, Jr.
patent: 3609977 (1971-10-01), McCormick
patent: 3888079 (1975-06-01), Diesinger

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