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<< Click to Display Table of Contents >> cu, cm |
  
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<< Click to Display Table of Contents >> cu, cm |
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► Impeller | Blade properties 
[ Axial impellers only ]
On tabsheet cu, cm the velocity triangles at every span can be defined in accordance to the radial equilibrium. These velocity triangles are design parameters and might be used for the determination of the stagger angles and chord lengths.
It can be chosen from 4 different modes concerning the manipulation of swx(r) and cux·r(r) resp., where the index x is 1 for the leading edge and 2 for the trailing edge:
Variable load (swirl), Variable load (cu) |
Free vortex |
Variable load rel. to free vortex |
The swx(r) or cux·r(r)-specification is controlled by a second order Bezier curve. |
swx(r) and cux(r) are defined to get the same swirl at every span:
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The slope is the derivative according to:
With a slope of zero a free vortex distribution is set. |
Please note: There is not always a solution of the differential equation of the radial equilibrium. Therefore some Bezier point constellations are not possible.
At the second tab of the diagram the distribution of the corresponding degree of reaction is displayed: R = Δhstat/Δhtot
