GB749745A - Fuel control means for jet-propulsion engines - Google Patents

Abstract

749,745. Jet propulsion plant. LUCAS (INDUSTRIES), Ltd., J. June 5, 1953 [March 14, 1952], No. 6642/54. Class 110(3) A reheat fuel supply system for a jet propulsion engine includes a liquid fuel operable mechanism consisting in part of a piston movable by the fuel for actuating the jet exit control, the piston or a part connected thereto also controlling the fuel supply to the reheat burner so that the burner only becomes operative when the exit control has moved to the open position. A jet pipe a, Fig. 1, having a reheat burner e and a variable area nozzle formed by a pair of pivoted toothed segments b is supplied with fuel by a pump j through a control valve k. When the valve k is opened fuel flows into the cylinder m and forces the spring loaded piston n upwards and opens the segments c. After a given movement of the piston n, the entrance to the pipe h is uncovered and fuel passes to the burner e. The spring o returns the piston to the original position when the valve k is closed. In a modification, Fig. 3, a passage 12 is supplied with fuel by a pump driven by an air turbine, the air for which is taken from the compressor supplying air to the combustion chamber of the engine. When the fuel control valve is opened, the fuel pressure acts on the spring loaded piston 4 which moves to the right and opens the nozzle segments. Meanwhile the closure member 17 remains closed under the action of a spring 19. When the piston reaches the end of its movement, the groove 24 of the piston valve 23 connects the passages 21, 27 and the preponderating fuel pressure acting on the right side of the diaphragm 18 opens the closure member 17 and allows fuel to pass to the reheat burners through the passage 13. The piston rod 6 may actuate the nozzle segments direct or through a servomotor. Specification 608,963 is referred to.