Сalculation models of isoentropic quasi one-dimensional flows

United method for the investigation of isoentropic gas flows is proposed. May be this is the flow of the chemical homogeneous gas, the mechanical gas mixture, the gas mixture with rotational and vibrational degrees of freedom, the mixture with chemical reactions. One of fundamental steps in this method is the transition from the densities of extensive parametres to conjugate intensive parameters in gasdynamic equations. General formula for the entropy dependence on intensive parameters is obtained. It is shown that in quasi one-dimensional approach gasdynamic problems are reduced to unified systems of algebraic equations. The solution methods of these systems are discussed.