RESEARCH PAPERS: Gas Turbines: Controls and Diagnostics

A Blade-by-Blade Tip Clearance Measurement System for Gas Turbine Applications

[+] Author and Article Information
A. G. Sheard, B. Killeen

Rotadata Limited, Derby, United Kingdom

J. Eng. Gas Turbines Power 117(2), 326-331 (Apr 01, 1995) (6 pages) doi:10.1115/1.2814098 History: Received February 04, 1994; Online November 19, 2007


It is difficult to make a reliable measurement of running clearance in the hostile environment over the blading of a modern gas turbine. When engine manufacturers require the measurement to be made over every blade during live engine tests, system reliability, ruggedness, and ease of operation are of primary importance. This paper describes a tip clearance measurement system that can measure clearance over every blade around a rotor. The measurement system concept is presented, and the system design described in detail. Commissioning of the measurement system on a compressor test facility, and the results obtained are discussed. An analysis of system performance during the commissioning trials concludes the paper.

Copyright © 1995 by The American Society of Mechanical Engineers
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