Accession Number : AD0863197

Title :   Checkout of Turbine Engine Foreign Object Damage.

Descriptive Note : Final rept. Dec 67-Mar 69,

Corporate Author : IIT RESEARCH INST CHICAGO IL

Personal Author(s) : Bridges, Jack E. ; Schwab, Ronald B.

Report Date : JUN 1969

Pagination or Media Count : 139

Abstract : Since operation of a turbine engine which contains foreign object damage (FOD) may result in either fatigue failure of damaged parts or possible catastrophic failure of the entire engine, the detection and assessment of the damage severity as well as the compressor's operational status condition is important. On the other hand, premature overhaul of the engine, based only upon visual inspection of the first-stage and second-stage blades, results in considerable unnecessary expense in overhaul costs and spare replacement engines. In attempting to solve this problem, an exploratory model system was designed and fabricated based upon detection techniques developed in a previous study. This system employs eddy-current detectors which are mounted in the compressor shroud above the blade tips. These detectors monitor blade tip curl, blade-to-blade spacing, and blade twist during in-flight or flight-line operational inspection of the engine which are indicative of FOD. Tests were run on a J-47 and a J-57 compressor which contained simulated FOD to demonstrate the system's capability for measuring geometric deformation of the blade tips beyond the normal blade tolerances. (Author)

Descriptors :   (*TURBOJET ENGINES, DAMAGE), (*COMPRESSOR BLADES, CHECKOUT EQUIPMENT), INGESTION(ENGINES), MAGNETIC PROPERTIES, MILLIMETER WAVES, INTERFEROMETERS, MAINTENANCE, MONITORS, DETECTORS, GROUND SUPPORT EQUIPMENT, TEST METHODS, SIMULATION, PREDICTIONS.

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE