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The Cordier diagram is based on an intensive empirical analysis of proved turbomachinery using extensive experimental data.

At the top right you can switch between different coordinate axes:

relative: Specific diameter δ vs. Specific speed σ (or nq or Ns); original Cordier diagram

absolute: Impeller/Rotor diameter d vs. Rotational speed n; valid for fixed design point values

Additionally, straight lines for the work coefficient ψ and the flow coefficient φ are displayed.

The Cordier diagram is displayed in Global setup and the Main dimensions.