Four necessary conditions for steady irrigational compressible flow through a straight cascade of blades are derived from the rotationality condition and the conservation of mass and momentum. Expressions are obtained which measure the degree to which an approximate compressible flow solution departs from these conditions. The expressions may be used as a measure not only of how well a given flow solution approximates the flow of the usual polytrophic gas, but also of how well it approximates the flow of an arbitrary barotropic fluid.
展开▼
