Volute > Diffuser > Additional views

The following information can be displayed in the diffuser dialog using the "Additional views" button:

3D-Preview

3D model of the currently designed diffuser geometry as well as spiral surfaces.

Velocity ratio cOut / cIn	Deceleration ratio
Length L	Length of the diffuser
Angle to centerline φ	Angle between connecting line impeller-center ↔ outlet branch center and diffuser start section
Center distance C	Distance from the h-line to the center point
Cone angle ϑ	Cone angle from DIn to DOut over the length L
Max. theoretical cone angle ϑmax	ϑmax=16.5°(DIn/2/L)½ , see Gülich, not for turbines
Radius of centerline R	Radius of middle line (for radial diffuser only)
Diffuser outlet center C	Spatial position of diffuser outlet

Equivalent diameter D	Diameter of the equivalent circle at the diffuser inlet / outlet
Area A	Area at diffuser inlet / outlet
Velocity c	Velocity at the diffuser inlet / outlet
Pressure p	Pressure at the diffuser inlet / outlet
Total pressure pt	Total pressure at the diffuser inlet / outlet

For turbines and compressor additional information is visible:

Temperature T	Temperature at the diffuser inlet / outlet
Total temperature Tt	Total temperature at the diffuser inlet / outlet
Density ρ	Density at the diffuser inlet / outlet
Mach Number Ma	Mach Number at the diffuser inlet / outlet

Spiral losses are predicted using the theory of Aungier [Outlet Volute only]:

Diffuser cross sections (z-r)

Area distribution (l-A)