Calculation of flow induced by gas injection through the walls of a duct of finite length

A method is proposed for calculating gas flow in a narrow plane duct of finite length, with gas injected through the duct walls and outflowing from the duct at a specified pressure. The calculations are carried out in the Prandtl approximation. The method allows the determination of flow characteristics for different characteristic Mach number values based on the results of a single calculation for a fixed Reynolds number. The procedure for considering the ellipticity of the problem is substantially simplified.