Results are presented for contact stylus measurements of surface roughness on in-service turbine blades and vanes. Nearly 100 turbine components were assembled from four land-based turbine manufacturers. Both coated and uncoated, cooled and uncooled components were measured, with part sizes varying from 2 to 20 cm. Spanwise and chordwise two-dimensional roughness profiles were taken on both pressure and suction surfaces. Statistical computations were performed on each trace to determine centerline averaged roughness, rms roughness, and peak to-valley height. In addition, skewness and kurtosis were calculated; as well as the autocorrelation length and dominant harmonics in each trace. Extensive three-dimensional surface maps made of deposits, pitting, erosion, and coating spallation expose unique features for each roughness type. Significant spatial variations are evidenced and transitions from rough to smooth surface conditions are shown to be remarkably abrupt in some cases. Film cooling sites are shown to be particularly prone to surface degradation.
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October 2001
Technical Papers
The Many Faces of Turbine Surface Roughness
Jeffrey P. Bons,
Jeffrey P. Bons
Air Force Institute of Technology, Wright-Patterson AFB, OH 45433
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Robert P. Taylor,
Robert P. Taylor
Mississippi State University, Mississippi State, MS 39762
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Stephen T. McClain,
Stephen T. McClain
Mississippi State University, Mississippi State, MS 39762
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Richard B. Rivir
Richard B. Rivir
Air Force Research Laboratory, Wright-Patterson AFB, OH 45433
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Jeffrey P. Bons
Air Force Institute of Technology, Wright-Patterson AFB, OH 45433
Robert P. Taylor
Mississippi State University, Mississippi State, MS 39762
Stephen T. McClain
Mississippi State University, Mississippi State, MS 39762
Richard B. Rivir
Air Force Research Laboratory, Wright-Patterson AFB, OH 45433
Contributed by the International Gas Turbine Institute and presented at the 46th International Gas Turbine and Aeroengine Congress and Exhibition, New Orleans, Louisiana, June 4–7, 2001. Manuscript received by the International Gas Turbine Institute February 2001. Paper No. 2001-GT-163. Review Chair: R. Natole.
J. Turbomach. Oct 2001, 123(4): 739-748 (10 pages)
Published Online: February 1, 2001
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Received:
February 1, 2001
Citation
Bons, J. P., Taylor, R. P., McClain, S. T., and Rivir, R. B. (February 1, 2001). "The Many Faces of Turbine Surface Roughness ." ASME. J. Turbomach. October 2001; 123(4): 739–748. https://doi.org/10.1115/1.1400115
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