Initial Experience with a Sensor Capable of Detecting Blade Passage Through the Case Wall (No Holes)

摘要

It is possible to detect passage of turbomachinery blades without penetrating the engine case. This “lookthrough the wall” sensor eases the addition of a PHM system to an engine.This paper introduces this sensing concept, summarizes the physics, and presents results of preliminarytests. Blade material and geometry, case material, thickness and temperature, blade tip clearance, sensordetail and design and blade tip velocity all affect the strength and quality of the signal detected.