Abstract:
A solid rocket motor uses at least one thermally conductive wire or at least one pair of electrically conductive wires to increase a burn surface area of a propellant grain and thus a thrust of the rocket motor. The rocket motor includes a pulse chamber containing a burnable propellant grain, a propellant inhibited center bore bonded to surfaces of the burnable propellant grain, and at least one conductive wire coupled to the burnable propellant grain and arranged in variable regions along the propellant inhibited center bore. The conductive wire is configured for passive or active activation to ignite the propellant inhibited center bore that subsequently burns in the variable regions. The thermally conductive wire is formed of a refractory metal or refractory alloy material that enables the entire length of the wire to be heated simultaneously or nearly simultaneously when the wire is passively activated.
Abstract:
The invention relates to a space cold gas thruster operating with a solid propellant. The cold gas thruster of the invention comprises a tank (1) suitable for containing a solid propellant and a tank (1) heating device suitable for sublimating said solid propellant and forming gaseous propellant, the tank (1) having an aperture (7) for transferring said gaseous propellant outside said tank (1), such as a nozzle (7). The invention also relates to a process for determining the amount of remaining propellant in the propellant tank (1) of a cold gas thruster of the invention.
Abstract:
Propulseur (14) solide pour un lanceur, le propulseur étant adapté pour être séparé du reste du lanceur, et comportant une paroi (18) définissant une chambre de combustion (19) comportant une extrémité dite avant (19a) et une extrémité opposée dite arrière (19b), du propergol (24) disposé dans la chambre de combustion, un canal (26) de combustion traversant la chambre de combustion depuis l'extrémité avant vers l'extrémité arrière, une tuyère (22) disposée à l'extrémité arrière de la chambre de combustion, un allumeur (28) obturant le canal de combustion au niveau de l'extrémité avant de la chambre de combustion, une jupe (20) recouvrant l'allumeur à l'extrémité avant de la chambre de combustion, ladite jupe permettant la liaison mécanique avec le reste du lanceur, et un système d'éjection (34, 36, 38) de l'allumeur.
Abstract:
Изобретение относится к области защитных устройств танка. Способ защиты танка включает непрерывное излучение в окружающее пространство электромагнитных волн, выявление атакующего противотанкового боеприпаса, его сопровождение, определение скорости, направление подлета к танку, расчет оптимальной точки встречи атакующего боеприпаса, создание гиперзвуковой струи, направленной в расчетную точку, переносящей картечь и подрыв шрапнельного снаряда вблизи атакующего боеприпаса. Для создания гиперзвуковой струи и переноса картечи используется сферическая камера сгорания и сверхзвуковое сопло. Камера сгорания и сопло соединены конечными проводами с информационно-управляющей системой. Достигается повышение степени защиты танка.
Abstract:
A detonation thrust-producing device (10) includes an explosive (32) located in a recess (34) in an external surface of a body (16). Detonation of the explosive expels material out of the recess, providing thrust to the body in an opposite direction. A mass, such as a metal disk (58), may be placed blocking or covering the external opening. The body may be a part of a vehicle, such as an airborne projectile (12). The thrust-producing device may include multiple detonation motors arrayed around the body, capable of being individually or multiply detonated. Such thrust-producing devices may be used for attitude adjustment, steering, or other control of the flight of the projectile or other air vehicle. The detonation thrust-producing devices have the advantage of a faster-response time than propellant-based devices, and do not need the nozzles that are used with many propellant-based devices.
Abstract:
The present invention describes a hybrid rocket motor that includes a first solid reactant and at least one thrust nozzle and at least one moveable combustion control member within the hybrid rocket motor that restricts the contact of a first fluid reactant to the solid reactant in the combustion chamber. In this way it is then possible to regulate the exposure of the solid reactant to the fluid reactant and thus control thrust.
Abstract:
The rocket motor nozzle assembly of this invention includes a throat insert (22) and a carbon or silica protective eyelid (50). The throat insert has a carbon throat support (30) and a refractory metal shell (42, 44, 46). The shell is positioned radially inside the throat support to cover the inner surface of the throat support. The protective eyelid (50) covers a sufficient portion of the forward surface region (42) of the shell and the underlying converging portion of the throat support to protect these components against particle impingement. The protective eyelid extends sufficiently far forward along the converging/diverging pathway to cover and protect the forward face or edge of the throat insert and prevent the combustion gases from passing under the throat insert and reaching the radially outer surface of the throat insert. However, the protective eyelid leaves the throat surface region of the shell exposed to the converging/diverging pathway.
Abstract:
A pyrotechnic gas generant composition including a high oxygen balance fuel that is the resulting reaction product of an aminoguanidine or polyaminoguanidine salt and nitric acid, namely, aminoguanidine dinitrate, diaminoguanidine dinitrate, and triaminoguanidine dinitrate. Specifically, aminoguanidine dinitrate, diaminoguanidine dinitrate, and triaminoguanidine dinitrate can be used as monopropellants or in combination with oxidizers and additives as a solid bipropellant composition. In each instance, the high oxygen balance fuel(s) of the present invention provide(s) both high gas output and low production of solid combustion products. Specifically, the high oxygen balance fuel(s) may be incorporated into gas generators, gun propellants, inflation and expulsion devices, flotation devices, pyrotechnics, fire suppression devices and smokeless, reduced smoke and metallized rocket propellants.
Abstract:
La présente invention a pour objet: - des copolymères constitués de motifs butadiène (B), de motifs vinyltétrazole (VT), de motifs acrylonitrile (AN) et de groupes terminaux R non susceptibles de réagir avec des fonctions azoture; dont les motifs vinyltétrazole (VT) représentent de 9,9 à 45 % de leur masse, les motifs acrylonitrile (AN) représentent de 0,1 à 5 % de leur masse et dont la masse moléculaire moyenne en nombre (Mn) est comprise entre 2000 et 6000 g/mol (2000 g/mol ≤ Mn ≤ 6000 g/mol); et - des propergols solides susceptibles d'être obtenus à partir desdits polymères. Lesdits propergols conviennent pour renfermer tout type de charges énergétiques, notamment des charges énergétiques à acidité intrinsèque telles les charges d'ADN et de nitropyrazole.