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The overcoming of a mechanics problem on origin of secondary jet flows, ondynamics of its development and interaction with the main stream of the viscousfluid is reached by means of elucidation of the energy distribution in thestream at its interaction with the flow system walls and a body surface. Incontrast to a traditional conception on a total head of a fluid stream in apipe as a sum of a velocity head and a static pressure, it is ascertained thatthis sum is only longitudinal component of the stream total head vector. It isstated a new conception and it is produced the expressions for quantitativeevaluation of radial and tangential components of the stream total head vectorand for angle of its deflection from the stream axis. The new approach hasallowed rationally to explain the causes of origin of the secondary jet flowsand dynamics of its interaction with the main stream in various cases. Therebywith the taking into account of previous articles of the author the necessarytheoretical preconditions has been created for a working out of the modernphysically valuable apparatus for mathematical modeling of the real - viscous -fluid motion in any problems of hydromechanics and gas dynamics.

Fluid Motion Physics: The Total Head Vector of the Real Fluid Stream