초록 ▼

A fluidic set point amplifier provides an output signal which is strongly linear with respect to pressure of fluid supply, free of hysteresis, and has a zero crossing (set point) at a determined value of supply pressure. Uses of the set point amplifier include an all-fluidic pressure regulator, and

A fluidic set point amplifier provides an output signal which is strongly linear with respect to pressure of fluid supply, free of hysteresis, and has a zero crossing (set point) at a determined value of supply pressure. Uses of the set point amplifier include an all-fluidic pressure regulator, and a turbine engine fuel control having only a single moving part.

대표청구항 ▼

Fluidic set point amplifier apparatus comprising: a housing; said housing defining an inlet port communicating with a source of pressurized elastic fluid, an outlet port communicating with a source of reference pressure, and a flow path extending from said inlet port to said outlet port for communic

Fluidic set point amplifier apparatus comprising: a housing; said housing defining an inlet port communicating with a source of pressurized elastic fluid, an outlet port communicating with a source of reference pressure, and a flow path extending from said inlet port to said outlet port for communicating a flow of said elastic fluid therebetween; said flow defining a convergent-divergent (de Laval) nozzle having a convergent section leading from said inlet port to a throat section of minimum cross sectional flow area, and a divergent section extending downstream of said throat section to said outlet port; and an output signal port communicating with said throat section for providing a fluid pressure level output signal in response to a flow of elastic fluid in said flow path, whereby in response to a progressively increasing pressure differential between said inlet port and said outlet port said fluid pressure level output signal includes a progressively decreasing sub-reference pressure level followed by a progressively increasing sub-reference pressure level increasing to said reference pressure, and a progressively increasing supra-reference pressure level; which increasing sub-reference and supra-reference pressure levels are substantially linearly related to said increasing pressure differential between said inlet port and said outlet port and are substantially free of hysteresis. The invention of claim 1 further including: a combustion turbine engine having a compressor, a combustor, and a turbine, said compressor inducting ambient air and delivering this air pressurized to said combustor, said combustor receiving a flow of fuel from a source thereof along with said pressurized air for supporting combustion producing a flow of high-temperature pressurized motive gas, and said turbine expanding said motive gas to drive said compressor; fluid pressure responsive means for controlling the pressure of said flow of fuel from said source thereof to said combustor directly in relation with a fluid pressure control signal, conduit means communicating said compressor discharge with said fluidic set point amplifier apparatus inlet port, fluidic amplifier means for receiving from said aspiration port said output signal as a primary control signal and providing said fluid pressure control signal in response thereto.