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Blade setup |
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Blade setup |
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Ü Impeller | Blade properties 
On tabsheet Blade setup basic blade properties are defined.
(1) Selection of desired Blade shape
There are 5 different types:
Freeform 3D |
General 2D |
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Circular 2D |
Straight 2D |
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Radial element blades |
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The initial blade shape of a radial pump impeller is Freeform 3D, the default selection for a ventilator impeller is Circular 2D and for turbines Radial element blade.
For Freeform 3D-blades the design of Ruled surface blades is optionally possible which are generated by spatial movement of a straight line.
(2) Defining the blade thickness values at leading (LE) and trailing edge (TE) in panel Blade thickness s
Blade thickness is important for the blade angle calculation due to the blockage effect and flow acceleration.
By different thickness on hub and shroud side a tapering to the blade tip can be designed.
(3) Specification of incidence angle on blade leading edge (deviation from shockless inflow) on panel ß1: Incidence
Pump, Ventilator, Compressor |
Turbine |
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from ratio Q for shockles inflow / Q for max. efficiency |
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fully automatic by theory of WIESNER adapted by Aungier |
or directly by incidence angle i (RQ=100% or i=0° for shockless inflow) |
or directly by incidence angle i (i=0° for shockless inflow) |
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[ Pump-, Ventilator, Compressor impellers only ]
(4) Estimation of slip velocity in panel β2: Deviation flow – blade
fully automatic by selecting WIESNER theory
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input of coefficient a when selecting PFLEIDERER theory
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manual selection of angular deviation ß2B-ß2 resp. velocity ratio cu2/cu2,∞ by selecting Self
Page url: http://www.cfturbo.com/fileadmin/content/manual/en/index.html?bl_setup.html
