RESEARCH PAPERS: Gas Turbines: Controls and Dynamics

Capacitive Measurement of Compressor and Turbine Blade Tip to Casing Running Clearance

[+] Author and Article Information
D. Müller, S. Mozumdar, E. Johann

BMW Rolls-Royce GmbH, Dahlewitz, Germany

A. G. Sheard

Techniche Group Ltd., Coventry, United Kingdom

J. Eng. Gas Turbines Power 119(4), 877-884 (Oct 01, 1997) (8 pages) doi:10.1115/1.2817068 History: Received February 01, 1996; Online November 19, 2007


It is an established fact that the efficiency of a gas turbine engine has an inverse relationship with the clearance between the rotor blades and the casing (Tip Clearance, or TC). TC is an essential measurement during the testing of development engines. While commercial TC measurement systems are available, their applicability to an engine is dictated by engine size, geometry, physical accessibility, and temperature distribution around the measurement region. This paper describes the development of a TC measurement system, based on the capacitive measurement principle, which was undertaken to satisfy the application requirements of a specific class of gas turbine engines. The requirements included a relatively long and flexible cable to route the electrical signals out of the engine. The TC measurement system was successfully used during engine testing and valuable data were obtained.

Copyright © 1997 by The American Society of Mechanical Engineers
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