Development of streamwise counter-rotating vortices in flat plate boundary layer pre-set by leading edge patterns

作者：Hasheminejad S M^*; Mitsudharmadi H; Winoto S H; Low H T; Lua K S

来源：Experimental Thermal and Fluid Science, 2017, 86: 168-179.

DOI：10.1016/j.expthermflusci.2017.03.032

• Leading edge pattern
• Streamwise counter-rotating vortices
• Flat plate boundary layer
• Hot-wire anemometry

Development of streamwise counter-rotating vortices induced by leading edge patterns with different pattern shape is investigated using hot-wire anemometry in the boundary layer of a flat plate. A triangular, sinusoidal and notched patterns with the same pattern wavelength lambda of 15 mm and the same pattern amplitude A of 7.5 mm were examined for free-stream velocity of 3 m/s. The results show a good agreement with earlier studies. The inflection point on the velocity profile downstream of the trough of the patterns at the beginning of the vortex formation indicates that the vortices non-linearly propagate downstream. An additional vortex structure was also observed between the troughs of the notched pattern.

• 出版日期2017-9