Abstract
The control methods for coherent vortex structures of the boundary layer are systematized. Mechanical, dynamic, kinematic, electrical, acoustic, and combined methods are considered. A review of experimental studies of the integral characteristics of elastic plates is performed. The results are presented in the form of dependences of the friction resistance of elastic plates on the Reynolds number. An experimental complex for researching the drag of elastic surfaces has been developed and manufactured. The first installation is a hydrodynamic bench of low turbulence, and the second installation is a flat vertical wing for towing at high speeds. At both installations, the same flat elastic plates are studied in a wide range of flow rates. The third, fourth, and fifth installations are designed for towing axisymmetric bodies of various diameters, in the cylindrical part of which elastic cylinders are placed on strain gauges. The results of experimental investigations of elastic plates in the form of dependences of the drag coefficient on Reynolds numbers during flow around water and air flows are presented. Design schemes of elastic plates are considered. The results of towing tests of elastic cylinders of various diameters and lengths with different shapes of nose contours of the models are presented. An analysis of the results is given in the form of dependences of the drag coefficient on the Reynolds number. The effect of polymer additives on the friction resistance of elastic cylinders is investigated. An engineering method has been developed for selecting elastic plates to drag reduction.
Published Version
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