The Flowing System Gasdynamics Part 4: Influence of the incident flow velocity on the outflow velocity out of flowing eleme

Abstract

It is shown, that the introduction in Saint-Venant -Wantzel formula radicand of the free component in the form of quadrate of velocity of the incident gas flow on inlet of flowing element that was offered in the end of the XIX century and is remained till now it is physically inadequate. It is shown that this way is doubtful for hydromechanics and it absolutely is not reasonably for gasdynamics. Physically exact form of writing of static head law for flowing element and relevant to this, the modern form of Saint-Venant - Wantzel formula are submitted ad-hoc. The obtained expressions allow physically correctly to take into account both combined and isolated influence of pressure drop applying to the flowing element and velocity of incident gas flow on flowing element, on quantity of the outflow velocity of gas stream out of this flowing element, system. The obtained expressions are valid for a subsonic velocity of the incident gas flow. The particular expressions are obtained for liquid.