초록 ▼

A base bleed unit arranged to increase the range of fire or to reduce the time of flight for shells and projectiles includes a housing (1) surrounding a fuel charge (6) and associated igniter (4), extending from the rear portion of a projectile body (2) and including at least one outlet nozzle (5,5′

A base bleed unit arranged to increase the range of fire or to reduce the time of flight for shells and projectiles includes a housing (1) surrounding a fuel charge (6) and associated igniter (4), extending from the rear portion of a projectile body (2) and including at least one outlet nozzle (5,5′,5″) for combustion gases, which by means of a mass flow, and possibly combustion adjacent to the base plane, reduce existing base drag. According to an embodiment of the invention, the housing (1) comprises a caseshaped member 1 attachable against a projectile body (2), having at least one igniter (4) arranged adjacent to an internal plane of a restricting wall surface at the housing (1), located in an opposed relationship to the portion of the housing (1) attachable against a projectile body (2). The combustion flame of the igniter (4) is hereby maintained directed towards the fuel charge (6) and away from the outlet nozzle/nozzles (5, 5′,5″). Advantageously, a number of outlet nozzles (5, 5′, 5″) are used, arranged spaced in an annular relationship to each other, and preferably inclined towards the outer peripheral portion of the restricting wall surface. A number of igniters (4) are advantageously used, located in recesses or blind holes taken up by the inside plane of the restricing wall surface. It is further advantageous to arrange the open portion of each igniter (4) partly covered by a covering means, thus accomplishing a reduced outlet area. According to a second embodiment, the housing (1) may also be formed by attachment of a bottom member to a projectile body (2) having a rearwardly open projectile extension, said bottom member including one or a number of igniters (4).

대표청구항 ▼

A base bleed unit, comprising: a fuel charge; an igniter associated with said fuel charge; a member attachable to a rear portion of a projectile body, arranged to form a housing in combination with said rear portion surrounding said fuel charge and said igniter, and including at least one outlet noz

A base bleed unit, comprising: a fuel charge; an igniter associated with said fuel charge; a member attachable to a rear portion of a projectile body, arranged to form a housing in combination with said rear portion surrounding said fuel charge and said igniter, and including at least one outlet nozzle at a portion of the housing directed away from the projectile body, said outlet nozzle providing an open passage permitting communication from outside said housing to said igniter, said member including a restricting wall located at a distance from said rear portion, said fuel charge being arranged during combustion to generate a mass flow intended to reduce existing base drag, said igniter being included in the member and located adjacent to an internal surface of the restricting wall; said igniter being located within said housing to be ignitable by combustion of a driving charge from outside said housing communicating with said igniter via said open passage provided by said outlet nozzle, whereby upon ignition said igniter provides a flame directed toward said fuel charge and away from said outlet nozzle.