SINOPSIS

This paper describes different aspects of experimental and theoretical investigation of drag reduction by means of multislot injection technique. The semiempirical model of a turbulent boundary layer of fluid with heterogeneous distribution of the polymer additive concentration across thickness is developed. The analysis of influence of several multislot relative factors on flow development is carried out.
Several variants of different combined methods using an injection of polymeric solutions and microbubble mixtures as possible elements of shear flow control have been worked out. The developed method of multilayer injection into turbulent boundary layer has been verified in experiments both on models and in natural investigations of a surface vessel in USA under supervision of K.J. Moore in Pennsylvania State University and on Hawaiian Islands.
The obtained results can be applied as a tool of optimization of a construction and regime parameters of equipment developed with the aim of flow control by injecting the systems of high molecular weight polymeric substances.