Detailed experimental investigations have been conducted to gain profound knowledge of airfoil clocking mechanisms in axial compressors. Clocking, the circumferential indexing of adjacent rotor or stator rows with equal blade counts, is known as a potential means to modify the flow field in multistage turbo-machinery and increase overall efficiencies of both turbines and compressors. These beneficial effects on turbomachine performance are due to wake-airfoil interactions and primarily depend on the alignment of a downstream blade or vane row with upstream wake trajectories that are generated in the same frame of reference. The present survey describes and discusses the experimental research on Rotor and Stator Clocking effects in a low-speed 2.5-stage axial flow compressor. For both Rotor and Stator Clocking, variations of Stage 2 performance have been found that are sinusoidal in trend over the clocking angle and originate from a significant change in static pressure rise across the clocked blade rows. Time-averaged measurements basically suggest the highest pressure gain, if the upstream wakes pass through mid-passage of the downstream blade row. In case of Rotor Clocking, this may even lead to a variation in compressor operating range. The fundamental aerodynamic mechanism responsible for the clocking effect can be attributed to a shift of the suction-sided boundary layer transition over the clocking angle. Regarding overall Stage 2 performance, the investigations show that Full Clocking, i.e. the combination of Rotor and Stator Clocking, nearly doubles the potential of single row indexing.
Skip Nav Destination
ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
June 11–15, 2012
Copenhagen, Denmark
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4474-8
PROCEEDINGS PAPER
The Potential of Rotor and Stator Clocking in a 2.5-Stage Low-Speed Axial Compressor Available to Purchase
J. Städing,
J. Städing
TU Braunschweig, Braunschweig, Germany
Search for other works by this author on:
J. Friedrichs,
J. Friedrichs
TU Braunschweig, Braunschweig, Germany
Search for other works by this author on:
B. Becker,
B. Becker
Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz, Germany
Search for other works by this author on:
V. Gümmer
V. Gümmer
Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz, Germany
Search for other works by this author on:
J. Städing
TU Braunschweig, Braunschweig, Germany
J. Friedrichs
TU Braunschweig, Braunschweig, Germany
T. Waitz
TU Berlin, Berlin, Germany
C. Dobriloff
TU Berlin, Berlin, Germany
B. Becker
Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz, Germany
V. Gümmer
Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz, Germany
Paper No:
GT2012-68353, pp. 2453-2466; 14 pages
Published Online:
July 9, 2013
Citation
Städing, J, Friedrichs, J, Waitz, T, Dobriloff, C, Becker, B, & Gümmer, V. "The Potential of Rotor and Stator Clocking in a 2.5-Stage Low-Speed Axial Compressor." Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 8: Turbomachinery, Parts A, B, and C. Copenhagen, Denmark. June 11–15, 2012. pp. 2453-2466. ASME. https://doi.org/10.1115/GT2012-68353
Download citation file:
45
Views
Related Proceedings Papers
Related Articles
A Correlation-Based Transition Model Using Local Variables—Part II:
Test Cases and Industrial Applications
J. Turbomach (January,0001)
Observations of Transition Phenomena on a Controlled Diffusion Compressor Stator With a Circular Arc Leading Edge
J. Turbomach (July,2010)
Unsteady Transition Phenomena at a Compressor Blade Leading Edge
J. Turbomach (April,2008)
Related Chapters
Other Components and Variations
Axial-Flow Compressors
Aerodynamic Performance Analysis
Axial-Flow Compressors
Introduction
Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis