非金属動翼の光学式翼端すきまセンサ

概要

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The efficiency of a gas turbine engines is directly depending on the clearance between the rotational blade tip and the engine casing. Therefore, actual gas turbine engines makes an effort to minimize tip clearance, and generally, the tip clearance measurement is widely done. Typically tip clearance measurement is made used of sensors, applied magnetic-electric phenomenon, such as eddy-current type, electrical capacity type, spark/discharge type, etc. However, these sensors can not use of non-metal blade measurement. "R & D of Ceramics Gas Turbine" which AIST in old MITI of Japan carried out over fiscal 1988〜1998 intends to rapidly raise whole efficiency of gas turbine by manufacturing thermo stable parts by ceramics. In this ceramic gas turbine, the rotor blade is nonmetallic material (ceramics), so the conventional blade tip clearance sensor can not be used from the measurement principle. From the above fact, we produced blade tip clearance sensor which does not require a special device and a special processing experimentally as a result of studying the optical clearance sensor using the reflection of the light. On the details of the tip clearance sensor and the results of performance proof experiments are described.
社団法人日本ガスタービン学会の論文
2001-11-20