Mechanical enhancement of the burning rate of solid propellants

Details Mechanical enhancement of the burning rate of solid propellants Mechanical enhancement of the burning rate of solid propellants

1979-02-09

1990-08-28

Miller, Edward A.

Plastic and nonmetallic article shaping or treating: processes

Explosive or propellant article shaping or treating

102289, 149 192, 149 193, 149 194, 149 196, 149 198, 149 1991, 149 1992, 149 2, 1491096, C06B 4510, C06B 2100

Patent

active

049523414

ABSTRACT:
Disclosed is a method of enhancing the rate of consumption of a propellant s a result of having shrink tubes or spheres embedded in the propellant. The shrink tubes suitable for use in this method are derived from various polyurethane or polyolefin resins which undergo shrinkage when exposed to moderate heat. The mechanism of enhancement derives from the fact that when the flame front reaches the shrink tube or sphere, the tube or sphere undergoes shrinkage, and thus, exposes additional propellant surface to the burning process. High burning rate are achieved because of the apparent reduced overall propellant web created by the presence of and resultant action to these shrink tubes or spheres.
A modification of the method of this invention is to embed these plastic tubings in the propellant, raise the temperature of the propellant mass to a temperature at which the tubing will undergo shrinkage. The porosity, thus introduced into the propellant as a result of tubing shrinkage, will result in ultrahigh burning rates well beyond that achievable without prior shrinkage of tubing prior to burning the propellant mass.
A further modification of the method of this invention involves filling the thermally-shrinkable tubing with rapidly combustible propellant which would burn out more rapidly than the matrix propellant, and thus, produce even higher burning rates.

REFERENCES:
patent: 3023572 (1972-03-01), Teague
patent: 3677010 (1972-08-01), Fink et al.
patent: 3857239 (1974-12-01), Brock et al.
patent: 3901152 (1975-08-01), Alexander
patent: 3968724 (1976-07-01), Kowalick et al.
patent: 4090342 (1978-05-01), Rishel
patent: 4585799, Geschmentner
patent: 4709636 (1987-12-01), Mueller et al.

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