Cu-specification

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Cu-specification

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► Impeller | Blade properties

[ Axial machines only ]

On tabsheet cu, cm definition the velocity triangles at every span can be defined in accordance to the radial equilibrium.

It can be chosen from 3 different modes concerning the manipulation of cu2(r):

Variable load

Free vortex

Variable load rel. to free vortex

The cu2(r)-specification is controlled by a second order Bezier curve.

cu2(r) is defined to get the same swirl at every span:

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