International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Concave Surface Boundary Layer Flows in the Presence of Streamwise Vortices

  • Winoto, Sonny H. (Department of Mechanical Engineering, National University of Singapore) ;
  • Tandiono, Tandiono (Department of Mechanical Engineering, National University of Singapore) ;
  • Shah, Dilip A. (Department of Mechanical Engineering, National University of Singapore) ;
  • Mitsudharmadi, Hatsari (Temasek Laboratories, National University of Singapore)
  • Accepted : 2010.12.16
  • Published : 2011.03.31
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Abstract

Concave surface boundary-layer flows are subjected to centrifugal instability which results in the formation of streamwise counter-rotating vortices. Such boundary layer flows have been experimentally investigated on concave surfaces of 1 m and 2 m radius of curvature. In the experiments, to obtain uniform vortex wavelengths, thin perturbation wires placed upstream and perpendicular to the concave surface leading edge, were used to pre-set the wavelengths. Velocity contours were obtained from hot-wire anemometer velocity measurements. The most amplified vortex wavelengths can be pre-set by the spanwise spacing of the thin wires and the free-stream velocity. The velocity contours on the cross-sectional planes at several streamwise locations show the growth and breakdown of the vortices. Three different vortex growth regions can be identified. The occurrence of a secondary instability mode is also shown as mushroom-like structures as a consequence of the non-linear growth of the streamwise vortices. Wall shear stress measurements on concave surface of 1 m radius of curvature reveal that the spanwise-averaged wall shear stress increases well beyond the flat plate boundary layer values. By pre-setting much larger or much smaller vortex wavelength than the most amplified one, the splitting or merging of the streamwise vortices will respectively occur.

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References

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