2. One-dimensional flow approach

This approach focuses on the so-called average characteristics of a flow, i.e. those resulting from azimuthal and radial averaging over several axisymmetric surfaces between the hub and the machine casing. It results from the application of the conservation of momentum theorem, integrated in a domain comprising a fixed or moving annular vane grid, the machine envelopes delimited by upstream and downstream sections (see [BM 4 281 § 3] ) located sufficiently far from the vanes to consider that the flow has once again become uniform on average.

This approach enables an analysis...