Method and apparatus for measuring pressures
AssigneeGeneral Electric Company
InventorSyed J. Khalid
Life of this patent
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Abstract
A pair of pressure sensing probe tubes are placed in the fan discharge of a turbofan engine, aft of the outlet guide vanes (OGVs) the tubes being circumferentially spaced by a fraction of the OGV pitch. A comparing means receives both pressures sensed by the double-barrelled probes and aerodynamically actuates to automatically select the higher of the two pressures. An accurate pressure indication representative of the mainstream pressure is therefore obtained despite the localized lower pressure turbulence area that may be caused by the presence of the upstream outlet guide vane(s).
Claims12
An improved pressure sensing probe of the type for placement within a fluid flow chamber downstream of a plurality of spaced obstructions, and delivery of the flow to a pressure sensitive device to obtain an indication of pressure wherein the improvement comprises:
- a. a pair of probe tubes having open ends for placement at spaced positions within a fluid chamber for conducting the flow of fluid therefrom;
- and
- comparing means interconnecting the tubes' other ends and adapted to discharge to the pressure sensitive device the flow only from the tube having the higher pressure when there is a variance of pressure between said spaced positions.
An improved valve of the type having a cylinder, a pair of inlet ports, an outlet port, and a piston which moves within the cylinder to selectively open and close the inlet ports wherein the improvement comprises:
- a. a cylinder having end walls and side walls defining a pressure chamber;
- b. an outlet port fluidly communicating with said chamber;
- c. inlet ports oppositely disposed in said end walls and susceptible to having different fluid pressures existing therein;
- d. a piston movably disposed within said chamber and adapted to be axially moved toward, and in abutment with, the inlet port having the lower pressure to thereby close said lower pressure inlet port;
- and,
- e. guide means disposed between said cylinder side walls and said piston, said guide means having a plurality of surfaces in close positional relationship with said piston to provide a guide for maintaining said piston on the axis of said cylinder.
Dependencies are inferred from the claim text.