Abstract
Fibre bundle-based reflective optical sensors are good candidates for parameter monitorisation in aero engines. Tip clearance is one of those parameters of great concern that is necessary to monitor. Within this optical technology, the evolution experienced by a custom-designed optical sensor is presented from its first configuration up to the fifth one. The performance of the last configuration is compared with those of other two optical sensors that are also based on a fibre bundle design. The comparison has been carried out in an experimental program in a transonic wind tunnel for aero engines. The proven high resolution and sensitivity of the last configuration of the optical sensor opens up the possibility to detect blade defects, cracks, etc. that could otherwise be hard to track.
Highlights
System for Aero-Engine Applications.Among the various parameters of interest in gas turbines, blade tip clearance (BTC)is one of the most important as it affects their performance, safety and stability
After presenting the general design and working principle of the optical sensor, we will show the most representative results obtained from several test programs carried out in a wind tunnel commonly used for turbine testing
We will put an emphasis on BTC, but the presented results may bring inspiration for other gas turbine applications
Summary
System for Aero-Engine Applications.Among the various parameters of interest in gas turbines, blade tip clearance (BTC)is one of the most important as it affects their performance, safety and stability. For noncontact clearance measurements in gas turbines, there exist several technologies such as eddy current sensors [2,3,4,5,6,7], capacity sensors [8,9,10], microwave sensors [11,12,13] and optical sensors [14,15,16]. Among the latter, fibre-based reflective optical sensors offer a trade-off between high performance and implementation simplicity. We will put an emphasis on BTC, but the presented results may bring inspiration for other gas turbine applications
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