An experimental study was conducted to investigate surface heat transfer and boundary layer development associated with flow over a flat test surface covered with two roughness scales. Two-scale roughness was used because in-service aeroengines commonly display larger roughness concentrated at the leading edge with smaller roughness distributed downstream. The first scale, covering up to the first 5 cm of the test surface, was in the form of a sandpaper strip, an aluminum strip, or a cylinder. The second roughness scale covered the remainder of the test surface (2 m) in the form of sandpaper or a smooth surface. In Part 1, the surface heat transfer results are examined. Even though the roughness scales were hydraulically smooth, they induced significantly earlier transition onset, with the two-dimensional roughness causing earlier transition than three-dimensional roughness. All of the rough/smooth cases unexpectedly triggered earlier transition than rough/rough cases. This indicated that the scale of the step-change at the joint between two roughness scales was predominant over the downstream roughness on inducing early transition. Reducing the overall height of the step change was shown to have a greater effect on transition than the specific geometry of the roughness scale. [S0889-504X(00)00701-7]
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April 2000
Technical Papers
Effect of Two-Scale Roughness on Boundary Layer Transition Over a Heated Flat Plate: Part 1—Surface Heat Transfer
Mark W. Pinson,
Mark W. Pinson
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
11
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Ting Wang
Ting Wang
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
22
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Mark W. Pinson
11
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
Ting Wang
22
Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921
Contributed by the International Gas Turbine Institute and presented at the 44th International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, Indiana, June 7–10, 1999. Manuscript received by the International Gas Turbine Institute February 1999. Paper No. 99-GT-158. Review Chair: D. C. Wisler.
J. Turbomach. Apr 2000, 122(2): 301-307 (7 pages)
Published Online: February 1, 1999
Article history
Received:
February 1, 1999
Citation
Pinson, M. W., and Wang, T. (February 1, 1999). "Effect of Two-Scale Roughness on Boundary Layer Transition Over a Heated Flat Plate: Part 1—Surface Heat Transfer ." ASME. J. Turbomach. April 2000; 122(2): 301–307. https://doi.org/10.1115/1.555448
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