STUDYING THE POSSIBILITY OF IDENTIFYING THE CONTACT BETWEEN THE FAN BLADES AND THE GAS TURBINE ENGINE CASE IN FLIGHT
E. I. Zhuchenko, V. V. Chervonyuk, A. A. Stasevich
Gromov Flight Research Institute, Moscow region, Zhukovsky, Russia
Keywords: diagnostics, gas turbine engine, fan, vibrations, frequencies, damage, flight tests, blades, Fourier spectrum, radial clearance
Abstract
The paper justifies the danger of the contact between the fan impeller blades and the gas turbine engine (GTE) case, determines the factors affecting the radial clearance in flight, identifies the main causes of the contact, analyzes the current means of determining the radial clearance of the GTE, and proposes a technique for detecting the contact between the GTE fan rotor blades and its case in flight based on complex processing of the signals of the fan body vibration and pressure pulsation detectors behind the fan. Implementing an identification technique based on processing of vibration and pressure pulsation signals will improve flight safety, especially for prototype GTEs at the first flight test stages, without the need for additional preparation and installation of complex clearance control systems. This technique can be used to identify the contact when the radial clearance is extremely reduced, which will allow for the timely selection of the mode setback (where possible, at the stage of flight it occurred) to prevent significant damage caused by the contact.
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