Name
Title | ||
|---|---|---|
Capacitive sensor for active tip clearance control in a palm-sized gas turbine generator |
Abstract | ||
|---|---|---|
The efficiency of a gas turbine has an inverse relationship to the clearance between the rotor blades and the casing. Recent efforts in miniaturization of micro gas turbine engines have created a new challenge in blade tip clearance measurement. This paper describes the development of a capacitive tip clearance measurement system, based on a synchronous detection of a phase-modulated signal, for a palm-sized gas turbine engine with an integral ceramic rotor piece. A surface modification of the ceramic compressor and rotor with conductive coating is utilized to create a novel configuration of a tip clearance probe. The probe capacitance varies by approximately 120 fF for a 100-μm blade displacement. Periodic autocalibration is used to reduce the effects of temperature drift on the sensor output. The remaining measurement error drift of 1.5 fF/°C was caused by the temperature drift of the probe parasitic capacitor. The random uncertainty was between 1.9 and 6.9 μm depending on the tip clearance gap. |
Year | DOI | Venue |
|---|---|---|
2005 | 10.1109/TIM.2005.847233 | Instrumentation and Measurement, IEEE Transactions |
Keywords | Field | DocType |
capacitive sensors,distance measurement,engines,gas turbines,machine control,phase modulation,position control,rotors,signal detection,turbogenerators,active tip clearance control,blade tip clearance measurement,capacitive sensor,ceramic compressor,conductive coating,integral ceramic rotor,micro gas turbine engines,palm-sized gas turbine generator,periodic autocalibration,phase-modulated signal detection,surface modification,tip clearance probe,Blade tip clearance,capacitive sensor,micro gas turbine | Tip clearance,Capacitor,Capacitance,Casing,Control engineering,Capacitive sensing,Electronic engineering,Rotor (electric),Gas compressor,Miniaturization,Mathematics | Journal |
Volume | Issue | ISSN |
54 | 3 | 0018-9456 |
Citations | PageRank | References |
3 | 0.70 | 0 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Tibor Fabian | 1 | 12 | 2.28 |
| Fritz B. Prinz | 2 | 25 | 5.19 |
| Georg Brasseur | 3 | 3 | 0.70 |