The Measurement of Turbomachinery Stator-to-Drum Running Clearances PUBLIC ACCESS

[+] Author Affiliations
David P. Davidson

ROTADATA, Ltd., Derby, England

Robert D. DeRose, Arthur J. Wennerstrom

Aero Propulsion Laboratory, Wright-Patterson Air Force Base, OH

Paper No. 83-GT-204, pp. V001T01A054; 5 pages
  • ASME 1983 International Gas Turbine Conference and Exhibit
  • Volume 1: Turbomachinery
  • Phoenix, Arizona, USA, March 27–31, 1983
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7951-1
  • Copyright © 1983 by ASME


The clearance between a compressor or turbine case and rotating blades or shrouds has been measured in a variety of ways over the years with varying degrees of accuracy. However, one critical clearance which has defied active measurement heretofore has been that between the tip of a cantilevered stator vane and an adjacent drum rotor. A significant number of turbomachines under development, representing many millions of dollars, have met an inglorious end through unanticipated rubs which were experienced in this area.

The present paper describes how a device which was introduced by its manufacturer for conventional rotor tip or shroud clearance measurements was applied to measure stator-vane-to-drum clearance. The installation technique is explained, and the results of vane-to-drum measurements made with a research compressor are presented. Adaptations of the same technique should permit similar measurements to be made within a turbine, and possibly on rotating seals buried deep within a turbomachine.

Copyright © 1983 by ASME
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