Streamlined surface

A streamlined surface, which ensures control of a process in boundary and near wall layers of continuous medium flows and which is provided with a three-dimensional relief characterized by

• said three-dimensional relief being made in the shape of
• said concavities or convexities (1),
• curvature areas (2) and
• transition areas (3), and
• whereby any section of said concavities (1) or convexities along said streamlined surface has a shape of a smooth close line, described by the following relation:
• ##EQU3## where:
• r(.phi.,z) is a section radius in a direction of angle .phi. counted from a line interconnecting centers of adjacent concavities or convexities, or from any line, which lies in said section;
• z is a section height over a lowermost point of a concavity or section distance from an uppermost point of convexivity;
• r (h,o) is a radius of the concavity or convexity section in the direction of angle .phi.=0.degree.;
• .DELTA.r=r (h, 180)-r (h, 0) is the difference between radii of the concavity or convexity section in the direction of angles .phi.=180.degree. and .phi.=0.degree.;
• lc is the dimension of a curvature area projected onto a plane extending parallel to said streamlined surface;
• k=0.3 to 0.7 is a coefficient;
• -1<A.sub.1 <1, --is a coefficient of the shape of the section,
• -1<A.sub.2 <1, --is a coefficient of the shape of the section,
• the depth of the concavities (1) or convexities h is 0.0005 to 0.3 of the thickness of the boundary layer or of the equivalent hydraulic diameter of a duct,
• the curvature area (2) of the concavities or convexities has, in a plane perpendicluar to the streamlined surface, a common tangent with the transition area (3), which is located between the adjacent concavities (1) or convexities and which is made in a shape of a non linear bicurvature surface with radii R.sub.c1, R.sub.c2 meeting the following relations:
• .vertline.R.sub.c1 .vertline..gtoreq.3h and .vertline.R.sub.c2 .vertline..gtoreq.3h
• whereby a dimension D of the concavities (1) or convexities along the streamlined surface is
• D=(2 to 40)h,
• the dimensional l.sub.c of the curvature area (2) along the streamlined surface is
• .rho..sub.c =(0.05 to 0.3)D,
• whereas the dimensional l.sub.tr of the transitional area (3) along the line interconnecting the centers of the adjacent concavities (1) or convexities is
• l.sub.tr =(0.05 to 3)D.