초록 ▼

Bleed air flow from each engine of a multi-engine gas turbine powered aircraft is determined by using venturi flow probe sensors (50,100) which each include a venturi (52,102). The pressure differential associated with the pressure within the throat of the venturis (52,102) and the pressure immediat

Bleed air flow from each engine of a multi-engine gas turbine powered aircraft is determined by using venturi flow probe sensors (50,100) which each include a venturi (52,102). The pressure differential associated with the pressure within the throat of the venturis (52,102) and the pressure immediately upstream of the venturi is partially indicative of the bleed air flow associated with the respective engine. The appropriate sensed pressure and temperature values are provided to a controller (18) which calculates the bleed air flow from each engine. The controller (18) also calculates a trim signal (224) which is used to partially control the position of pressure regulating valves (14,64) in order to substantially equalize the flow of bleed air from each of the gas turbine engines.

대표청구항 ▼

An apparatus for substantially equalizing the flow of bleed air extracted from a plurality of gas turbine engines for delivery to a common bleed air duct, comprising: a. a plurality of regulator means, each receiving engine bleed air from one of the plurality of engines, wherein each regulator means

An apparatus for substantially equalizing the flow of bleed air extracted from a plurality of gas turbine engines for delivery to a common bleed air duct, comprising: a. a plurality of regulator means, each receiving engine bleed air from one of the plurality of engines, wherein each regulator means comprises, valve means, having a first inlet disposed to receive engine bleed air, having a first outlet, and having a variable flow area through which the engine bleed air flows, said valve means for controlling the air pressure at said first outlet by controlling the flow area that the bleed air flows through in response to a command signal, such that a pressure regulated flow of bleed air exits said first outlet; cooling means, for cooling said pressure regulated flow of bleed air, said cooling means having a second inlet disposed to receive said pressure regulated flow of bleed air exiting said first outlet, and having a second outlet through which cooled pressure regulated bleed air is discharged; a conduit, having a third inlet disposed to receive the cooled pressure regulated bleed air from said second outlet, and extending therefrom to the common, bleed delivery duct; a venturi, disposed within said conduit, having a throat through which at least a portion of the cooled pressure regulated bleed air passes; first sensing means, for sensing the air pressure in said conduit, and for providing a first signal indicative thereof; second sensing means, for sensing the air pressure in the throat of said venturi, and for providing a second signal indicative thereof; and third sensing means, for sensing the temperature of the cooled bleed air in said conduit, and for providing a temperature signal indicative thereof; and b. controller means, for receiving said first signal, said second signal, and said temperature signal, for computing as a function of said received signals the flow of cooled bleed air through said conduit in each of said plurality of regulator means, for comparing the computed flows, for generating a trim signal based on the comparison of the computed flows, and for providing to each of said valve means one of said plurality of command signals, each of said plurality of command signals is partially a function of said trim signal, such that the difference between the computed flows is driven towards zero thereby substantially equalizing the flow of the cooled bleed air from each of said plurality of regulator means into the common bleed air delivery duct.