| 摘要 |
A miniature vortex generator for delaying transition to turbulence in a flow of a fluid over a surface in vicinity of a leading edge, wherein the fluid has a kinematic viscosity v and the flow has a free-stream velocity U ∞, wherein the free-stream velocity varies in a streamwise direction of the flow approximately 5 as a power function of the distance from the leading edge with a leading power m. The miniature vortex generator comprises an array of substantially plate shaped elements protruding from the surface. Each of the elements is arranged at a distance from the leading edge in the streamwise direction, and each of the elements is arranged at an angle in the range from 9 to 18 or from 10 6 to 15 degrees relative to the streamwise direction. The height of each of the elements is non-decreasing with respect to the streamwise direction. The delay of transition turbulence has been observed only in fairly narrow height intervals depending on U ∞, v and m. |
