<< Click to Display Table of Contents >> Dimensions 

The main dimensions can be seen on Main dimensions panel. They can be recomputed by pressing the Calculatebutton. The computation is based on "Euler's Equation of Turbomachinery", on the continuity equation and the relations for the velocity triangles as well as on the parameters given in the tab sheets Setup and Parameters.
Individual main dimensions can be calculated separately using the button inside the value field.
You may accept the proposed values or you can modify them slightly, e.g. to meet a certain normalized diameter.
In case the checkbox Automatic is activated a new calculation will accomplished after any change of parameter. Then the manual alteration of the main dimensions is not possible.
Neighboring components
In specific cases the dimensions of the neighboring components at inlet and/ or outlet can be used to get exactly matching geometry.
This feature is available only for explicitly uncoupled components or sidebyside impellers.
In the right panel of any tab sheet an information panel is situated, which holds the computed variables in accordance to the actual state of design, the resulting Meridional section as well as the CordierDiagramm with the location of the best point. These three sections can be chosen by the appropriate soft buttons in the heading.
In the Value section the following variables are displayed for information which result from calculated or determined main dimensions:
Flow properties at: 
static pressure p 
Velocity triangles at: 
velocities u, cm, cm*, cu, c, wu, w 
Work coefficient 

Flow coefficient 

Meridional flow coefficient 

Specific diameter 

Average inlet velocity 

Inlet abs. circ. velocity component 

Inlet relative velocity 

Average outlet velocity 

Outlet circ. velocity component 

Outlet relative velocity 

Meridional velocity ratio 

Relative velocity ratio 

Axial force (thrust) 

Reynolds number 
with d1 = highest diameter at inlet 
with b1 = width at inlet 

with d2 = highest diameter at outlet 

with b2 = width at outlet 
NPSHR estimation 
(Available at inlet)
Available head level distance to vaporization at impeller inlet (pv = fluid vapor pressure) 
Lobanoff/ Ross
see diagram below this table 

Pfleiderer


Gülich


Stepanoff


Petermann


Europump

NPSHR prediction 
The Meridional preview is until now based on the main dimensions only.
The Cordier diagram can be used for checking the impeller diameter d2.
See Cordier.
The Velocity triangles are the result of a midspan calculation and are based on the design point and the main dimensions.