GB710412A - Means for controlling the speed of ram jet-propelled air craft, missiles or other aerial bodies - Google Patents

Abstract

710,412. Jet propulsion plant. LUCAS, Ltd., J. Dec. 4,1951 [Dec. 13, 1950], No. 30418/50. Class 110(3) [Also in Group XXIX] The speed of a jet-propelled aerial body at above the speed of sound is controlled by regulating the fuel supply thereto in dependence on the position of the shock wave associated with body. In Fig. 1, the supply of liquid fuel to a burner c in a hollow aerial body e is controlled by a throttle a supplied by a pump b. The throttle a is actuated by a spring- loaded servopiston g controlled by a vent valve i operated by a spring-loaded lever m connected to a diaphragm (or piston) p. The diaphragm p divides a chamber q into two compartments connected by passages r, s to two axially-spaced ports in the air intake of the body e. Normally the pressures acting on the diaphragm are substantially equal so that the vent valve i, is closed and the throttle a is open. When the shock wave is located between the passages r, s. the pressure rises in the passage s so that the vent valve i opens and the throttle a moves to shut-off or restrict the fuel supply and so limit the forward speed of the body. In a modification, the side of the diaphragm p open to the passage s is conected to an evacuated capsule so that the diaphragm now responds to the ratio of the pressures in the passages r, s which may therefore be located further apart than before. In a further modification, Fig. 3, the passage s is dispensed with and the vent valve i is operated by an elastic evacuated capsule n open to the passage r. The throttle a is actuated by a servo-piston g similar to that in Fig. 1 and the pressure drop across the throttle a operates through a diaphragm (or piston) 12 a further vent valve 8 controlling a servo-operated throttle 2 downstream of the throttle a. The fuel supply may alternatively be controlled by a spill valve or by otherwise regulating the output of the fuel pump b. Specification 603,155. [Group XXXIII]; is referred to. According to the Provisional Specification, auxiliary means may be provided to prevent the speed of the body increasing to such an extent that the shock wave lies ahead of the body. Such means comprise a further servo-vent . valve operated by a diaphragm (or piston) open to the atmosphere on its forward side and to the forward compartment of the first diaphragm on its rear side.