Blade properties

Ü Impeller | Blade properties

Definition of blade properties is made in two steps:

(1)	Blade setup

(2)	Blade angles

In the right panel some information are displayed which result from calculated or determined values:

BlProp_triangles

The Velocity triangles of inflow and outflow are displayed.

Continuous lines represent flow velocities on hub (blue) and shroud (green).

Velocities directly before and behind blade area are displayed by dashed lines to show the influence of blockage in the flow domain.

Furthermore the blade angles are displayed by thick lines in order to see the incidence angle on the leading edge and the flow deviation caused by slip velocity on trailing edge.

BlProp_values

Numerical values of velocity components and flow angles are displayed in a table. A short description is at mouse cursor too:

d	Diameter
α	Angle of absolute flow to circumferential direction
β	Angle of relative flow to circumferential direction
u	Circumferential velocity
cm	Meridional velocity (cm=wm)
cax	Axial component of absolute velocity
cr	Radial component of absolute velocity
cu	Circumferential component of absolute velocity
c	Absolute velocity
wu	Circumferential component of relative velocity: wu+cu=u
w	Relative velocity
τ	Obstruction by blades (see below)
i	Incidence angle: i = β1B - β1
δ	Deviation angle: δ = β2B - β2
wR	Deceleration ratio of relative velocity: wR=w2/w1

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