G - Physics – 01 – J
Patent
G - Physics
01
J
73/112, 123/136,
G01J 5/02 (2006.01) F01D 17/08 (2006.01) F01D 21/00 (2006.01) G01J 5/04 (2006.01) G02B 23/16 (2006.01)
Patent
CA 1126053
° ABSTRACT OF THE DISCLOSURE In order to measure the temperature of the mid-span first stage rotor blade of a gas turbine engine, an optical pyrometer is mounted in the inner casing of the gas turbine engine and includes an elongated sight tube extending from the optical lens of the pyrometer and through the wall of the engine separating the inner casing from the rotor. The sight tube includes an array of spaced apertures extending therethrough in the vicinity of the optical lens, with each aperture extending at an acute angle to the longitudinal axis of the sight tube away from the optical lens. Pres- surized air within the inner casing passes through the ar- ray of apertures and effectively forms a conically-shaped fluid screen for preventing smoke, dust, fumes, or other contaminants from contaminating the optical lens. A sec- ondary fluid screen may be provided by mounting the free end of the sight tube in an enlarged opening in the wall of the engine casing, whereby a secondary, generally cylin- drical flow of air is developed for shielding the open end of the sight tube. The upstream edge of the sight tube may project into the slow path of the combustion gases flowing to the rotor stage whereby such combustion gases will be deflected and directed around the circumference of the sight tube to further inhibit contaminants from entering the sight tube and contaminating the optical lens.
355998
Avco Corporation
Ridout & Maybee Llp
LandOfFree
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