摘要:
An annular aerospike nozzle for a vehicle, such as an upper stage rocket, is disclosed. The annular aerospike nozzle includes a centerbody and a plurality of thrust chambers spaced around the centerbody. Each thrust chamber has a throat and a nozzle portion extending aft of the throat. The nozzle portion has an exit dimension Dexit at an aft end. Each thrust chamber is spaced away from adjacent thrust chambers by a spacing distance Dspace, such that Dspace ≥ M * Dexit, where M ≥ 1.
摘要:
An attitude control and thrust boosting system (100) for a space launcher is disclosed, wherein the space launcher is equipped with a rocket engine (303) provided with an exhaust nozzle. The exhaust nozzle comprises a divergent portion (302) so designed as to make a supersonic gas flow exit through an exit section defined by a given angle of divergence with respect to a longitudinal axis of the rocket engine. The attitude control and thrust boosting system (100) comprises flaps (110, 111, 112, 113) that are arranged around the exit section, are shaped so as to extend the divergent portion of the exhaust nozzle, are mechanically decoupled from said exhaust nozzle and can be actuated to take different angular positions with respect to the longitudinal axis of the rocket engine. Control means (130) are also provided to receive quantities indicative of an actual attitude of the space launcher and an ambient static pressure, and to make the flaps (110,111,112,113) take a neutral angular position where the flaps (110,111,112,113) are inclined, with respect to the longitudinal axis of the rocket engine, according to an inclination angle greater than, or equal to, the given angle of divergence, in order to control the neutral angular position taken by the flaps (110,111,112,113) according to the ambient static pressure and to make one or more flaps (110,111,112,113) take an angular position different than the neutral angular position according to the actual attitude of the space launcher and to a required attitude for said space launcher.
摘要:
Tuyère à section de col variable de propulseur d'engin aérospatial, comprenant un logement cylindrique présentant un col (30) de diamètre d'ouverture inférieur au diamètre du logement, et un pointeau (24) apte à coulisser à l'intérieur du logement entre une position avant de fonctionnement à haut débit dans laquelle un nez (28) est en retrait par rapport au col du logement et une position arrière de fonctionnement à bas débit dans laquelle le nez est en butée contre le col, le pointeau comprenant une tige (26) destinée à coulisser à l'intérieur du logement de la tuyère, la tige se terminant par le nez ayant un diamètre décroissant. Le nez de la tige est apte à venir en butée contre le col du logement de la tuyère formant siège et comprend au moins deux rainures (34) axiales ménagées à sa périphérie externe pour permettre le passage de gaz lorsque le nez est en butée axiale contre le col du logement de la tuyère.
摘要:
According to the invention, upstream of the injection means, the combustible propellant and the oxidant propellant are mixed at constant pressure; and to inject the said mixture of propellants at constant pressure into the combustion chamber (1), injection means (7 to 11) are chosen, making it possible to vary the flow rate of the said injected mixture.
摘要:
A rocket booster has an annular shape, with a casing defining an annular space therewithin, and a solid rocket fuel in the annular spacing. The rocket booster also includes one or more nozzle pieces, mechanically coupled to the casing, that define one or more nozzles at the aft side of the rocket booster. The rocket booster may be mechanically coupled to an object protruding from the back of a fuselage of a flight vehicle, such as a missile. For example, the rocket booster may be placed around an aft turbojet nozzle of the flight vehicle. This allows the rocket booster to be used in situations where primary propulsion must be running both before and after (and perhaps during) the firing of the rocket booster.
摘要:
Ensemble comportant un support (10) configuré pour être fixé à un engin spatial, un propulseur, un dispositif d'orientation (40) comportant au moins un actionneur (44) apte à modifier l'orientation du propulseur, l'actionneur (44) comprenant au moins deux électrodes et au moins un polymère électro-actif disposé entre les au moins deux électrodes.
摘要:
A duct includes first and second bellows sections. First and second torsional rings are attached to, respectively, the first and second bellows sections. First and second dynamic seals are sandwiched between the first and second torsional rings.
摘要:
Un dispositif de modulation de section d'éjection de gaz (130) destiné à être placé dans une tuyère (120) en amont du col (121) de ladite tuyère comprend un pointeau (140). Le pointeau (140) comporte une partie proximale (142) reliée à un guide de commande (134) et une partie distale (143) en forme de pièce de révolution, le pointeau (140) étant mobile entre une position rétractée et une position avancée. Le pointeau (140) présente dans sa partie distale (143) une première section de forme concave (1431) et une deuxième section de forme concave (1432) située en aval de la première section.
摘要:
A missile (12) includes a control system (10) having divert and attitude control system thrusters (16, 18) with control valves (20). Each of the control valves has a nozzle plate (26) having a plurality of small nozzles (24) therein. The nozzle plate includes a pair of portions (30, 32), one of which is rotatable relative to the other. Control of flow through the nozzle plate may be effected by relative positioning of the portions of the nozzle plate. An upstream convergent portion of the nozzle plate may be fixed relative to the missile, with a downstream throat and/or divergent portion of the nozzle plate moveable. Movement of the movable portion of the nozzle plate may be accomplished by use of an actuator that is external to the missile body. The control valve provides a simple, lightweight and compact way of controlling flow from a divert thruster.