| 摘要 |
<p>A streamlined surface has concavities (1) (convexities), the cross-section of the concavity (1) (convexity) has the form of a smoothly curved closed line described by a certain relationship, the depth of the concavities (1) (convexities) h=0.005-0.3 of the thickness of the boundary layer, the curved areas (2) of the concavities or convexities have a common tangent in any cross-section transversal to the initial surface with a transitional section (3) in the form of a surface of double curvature with radii /Rcurv1/ >/= 3h and /Rcurv2/ >/= 3h. The size of the concavities (1) (convexities) along the streamlined surface equals D=(2-40)h, the size of the curved area (2) along the streamlined surface is l3=(0.05-0.3)D, the size of the transitional section (3) along the line connecting the centres of the concavities or convexities is ln=(0.05-3)h, and the centres of the concavities (1) or convexities are located in the vertices of a parallelogram with the sides equal to (1.05-4)D and with an angle at the vertex alpha p=20-90<o>. <IMAGE></p> |
