Title: Method and apparatus for measuring pressures

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).

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Inventors: Khalid, Syed J. (Cincinnati, OH, US)

Application Number: 661980
Filing Date: 1976-02-27
Publication_date: 1977-09-27
Assignee: General Electric Company (Cincinnati, OH)
Primary Class(es): 73/861.64 73/756, 137/112
Other Classes:
US Patent Ref:

2761463	Sep, 1956	Wagner	137/112.
3868625	Feb, 1975	Speigner et al.	73/115.

Other Refs:
Primary Examiner: Wood, Donald O.
Assistant Examiner:
Attorney: Bigelow; Dana F., Lawrence; Derek P.