On accuracy of the quasi-one-dimensional model of smooth wall channel

Quasi-one-dimensional model describing viscous gas-dynamic flow through smooth channels of a variable cross section is represented here. This model has many advantages both in accuracy, and in completeness of the description of processes. Being mathematically one-dimensional, this model allows taking into account viscous friction with the channels wall, chemical reactions, additional injection and other physical-chemical processes. Besides this model takes into account a curvature of channels wall and it is suitable for great inclination angles.