1. Operating characteristics

We could plot the characteristic curves of a compressible-fluid turbomachine in a coordinate system based on the elements of velocity triangles. For a fan, we would thus have a curve relating the theoretical manometric power µ _th and the manometric power µ to the flow coefficient δ ′ (figure 1 ), where:

• µ _th = (u ₂ v _2u – u ₁ v _1u ) / $u_2^2$...