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<< Click to Display Table of Contents >> Dimensions |
  
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<< Click to Display Table of Contents >> Dimensions |
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In the panel Shaft, the required shaft diameter is computed.
¢ Shaft/ Hub
The hub diameter is determined by the user and depends on the shaft-hub connection.
The main dimensions can be seen on Main dimensions panel. They can be recomputed by pressing the Calculate-button. 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 side-by-side 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 Cordier-Diagramm 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 |
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Flow coefficient |
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Meridional flow coefficient |
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Specific diameter |
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Inlet velocity |
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Inlet velocity (net) |
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Outlet velocity |
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Outlet velocity (net) |
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Outlet width ratio |
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Meridional velocity ratio |
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Reynolds number |
with d1 = highest diameter at inlet |
with b1 = width at inlet |
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with d2 = highest diameter at outlet |
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with b2 = width at outlet |
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 mid-span calculation and are based on the design point and the main dimensions.
Problem |
Possible solutions |
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Inlet/ Outlet: Pressure and temperature not within the liquid phase of the fluid. |
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If the fluid model = CoolProp, fluid properties will be calculated as function of pressure and temperature. In case the local pressure and temperature are not above the vapor pressure curve, the fluid state is not valid. |
Increase main dimensions (width, diameter etc.) or change Global setup (e.g., decrease mass flow, increase pressure, decrease temperature). |