摘要:
The electronic device for controlling gas turbine engines includes a plurality of transducers which will generate electrical signals proportional to speed, temperature and pressure to indicate instantaneous operational conditions of the engine. These signals are processed in an electronic circuit and compared with optimum signals to provide an output signal for controlling a servo valve in the fuel feed circuit for the engine.
摘要:
A mathematical expression is converted and approximations applied to remove complex processes, simplifying the circuitry of system which controls compressor speed in dependence on ambient temperature.
摘要:
Governing device for a gas turbine system, such as a vehicular or aircraft engine, having at least one governor to vary the fuel flow, characterized in that the governor output representing the ratio of fuel flow to one or a combination of engine characteristics is automatically multiplied by that one or combination of engine characteristics to obtain a fuel flow control signal.
摘要:
Governing device for a gas turbine system exemplified by a vehicular or aircraft engine having a first governor to vary the fuel flow and a second governor to additively or alternatively reduce the fuel flow apportioned by the first governor, where the sensor provided for detecting variations in the regulating variable of the second governor is subject to lag, characterized in that the variation in fuel flow is automatically convertible into a variation ( Delta T) of the regulating variable (T) of the second governor (R2), making it variable in time, and in that the latter variation ( Delta T) is automatically imposed on the deficiently sensed instantaneous value (Ti) of this regulating variable (T).
摘要:
A throttle valve arrangement includes a fixed orifice in series with a variable orifice constituted by a throttle valve member coacting with ports. The throttle valve member is spring loaded to a fully open position and has an area at one end subjected to the pressure downstream of the fixed orifice to urge the throttle valve member in the same direction as the spring loading. A smaller area at the opposite end is subjected to the pressure upstream of the fixed restrictor. A step in the valve member is subjected to pressure downstream of the variable restrictor.
摘要:
A fuel control apparatus for a gas turbine engine reheat system which includes a plurality of burners has a plurality of variable metering orifices associated with the respective burners and a plurality of servo-responsive throttle valves downstream of the respective orifices. The apparatus includes an arrangement for controlling the servo pressures applied to the throttle valves, this arrangement including a governer driven by the engine and mounted on an internal ring gear. A first valve spool is coupled to the ring gear and is axially movable by the governer. The ring gear includes a coaxial spur gear which meshes with further spur gears forming parts of respective valve spools which control the servo pressures for associated throttle valves.
摘要:
A fuel control disclosed in connection with a gas-coupled gas tubine engine for shaft power output purposes. The fuel control is supplied by a transfer pump and a pressure pump in series and delivers fuel to a nozzle in the engine combustion apparatus. The control receives an input of gas generator speed and an input of compressor discharge pressure. It receives electrical inputs serving to limit turbine inlet temperature and power turbine speed, and may include an electrical On-Off input. Flow of fuel to the engine is directly controlled by a slave valve which responds to pressure of fuel delivered to the nozzle and to a control pressure derived from the pressure pump outlet. The control pressure is developed between an upstream orifice and parallel downstream valves which include a solenoid valve operated to limit turbine inlet temperature and power turbine speed, a valve responsive to compressor discharge pressure, and a governor valve responsive to gas generator turbine speed. The OnOff control bleeds the nozzle to the fuel tank when the engine is turned off. During engine deceleration, the slave valve stops fuel flow without emptying the nozzle and the fuel line to it. The metering head across the slave valve is controlled by a differential pressure responsive by-pass valve which discharges excess fuel to the pressure pump inlet. The by-pass valve may define a passage for fuel to maintain a pilot flame during deceleration.
摘要:
A fuel supply system for a gas turbine engine has a positivedisplacement pump driven by the engine a valve downstream of the pump having an inlet and two outlets. A control element varies flow through the two outlets simultaneously. One of the outlets supplies fuel to the engine and the other outlet communicates with a pressure-responsive spill valve with the low pressure side of the pump. The spill valve arrangement is such that the pressures at the valve outlets remain substantially equal.
摘要:
A fuel control system with a gas turbine engine that has a slinger-type burner nozzle. The fuel control system is attached to, but does not rotate with, the engine shaft and includes an electronically controlled valve member operated by a reversible motor upstream of the slinger nozzles for controlling the supply of fuel thereto. Fuel is delivered to the valve member from the fuel tank which is pressurized to compressor discharge pressure.
摘要:
A gas turbine control system has a plurality of closed loop controls each responsive to a different operating condition and an additional loop control which sets the fuel control signal in accordance with a desired power setting. A gating device allows only one of the fuel control signals generated by each loop control to control the fuel flow servo means, that signal being the one calling for the smallest fuel flow. A cubic function generator is positioned in circuit with the propulsion lever and modifies the desired power signal to produce a ship speed which is linear with respect to the propulsion lever position. A feedback signal indicative of actual fuel flow is also in circuit with the propulsion lever. A first propeller pitch control is responsive to the propulsion lever position and brings the pitch from zero to full as the power setting is concurrently increased. A second propeller pitch control is responsive to an actual shaft speed signal and is operative to hold the shaft speed relatively constant by varying pitch. There are three modes of operation, each having a certain minimum power level and other modifications so as to improve vessel-maneuvering characteristics.