Impeller > Mean line design > Blade mean lines

The following information can be displayed in the mean line dialog using the "Additional views" button:

The display of the curves can be toggled by the check boxes that are accessible via in the lower corner on the left. In case of splitter those curves of main and splitter blades can be hidden/shown. In case separate curves for suction and pressure side are existing their visibility can be toggled too.

Special display option for splitter blades:
The display of main and splitter curves can be toggled by the check boxes independently.

The visibility of the inner mean lines can be toggled via "Inner spans".

Informational values	The tables contain additional values for information.
Blade passage area	Progression of the blade passage area within a channel built by two neighboring mean surfaces as well as hub and shroud. Additionally for compressible fluids the critical area can be displayed.
Isentropic Mach number	The isentropic Mach number is calculated on the basis of the local total state, on the mass flow according to the design point and on the Blade passage area. Here perfect gas behavior is assumed. The flow may by choked and can be subsonic or supersonic according to the settings in the inlet and outlet of the main dimensions. [ Only compressible fluids and stators ]
3D-Preview	3D model of the currently designed mean surface as well as surfaces of hub and shroud.
x, y frontal view	The Frontal view represents the designed mean lines in a frontal view, including diameters dH and d2.
t, m conformal mapping	The spatially curved meridional flow surfaces are mapped to a plane by coordinate transformation. This coordinate system has the angle in circumferential direction t as abscissa and the dimensionless meridional extension m as the ordinate. ¢ See t, m conformal mapping
z, T unwrapped view	Peripheral projection of all mean lines (z = axial coordinate, T = circumferential coordinate). [ Axial impellers only ]
βB blade angle	βB progression along every mean line. Too high local extreme values should be avoided if possible. Additionally βF progression can be displayed (see display options). Those relative flow angles are calculated on the basis of the velocity triangles determined in Blade-to-blade flow 1D.
βB blade angle (meridian)	βB progression projected in meridional surface.
t wrap angle	Progression of tangential coordinate t along every mean line.
t wrap angle (meridian)	Progression of tangential coordinate t projected in meridional surface.
λ lean angle	Distribution of the lean angle λ. The blade lean angle can be manipulated only indirectly. With the lean angle the quasi-orthogonal of the blade leans away from the z-direction. The quasi-orthogonal is a straight line connecting corresponding points on hub and shroud mean line. These lines are setup in the blade properties dialog and are displayed in the meridional cut if just two mean lines were chosen. Otherwise the quasi-orthogonal is not displayed but internally determined by connecting corresponding points on hub and shroud mean line. ¢ See Blade lean angle
Strike velocity	¢ See Strike velocity
Blade surface values	¢ See Blade surface values
Blade-to-blade flow 1D	¢ See Blade-to-blade flow 1D
Blade-to-blade flow 2D	¢ See Blade-to-blade flow 2D

Additional views

Additional views

Informational values

The tables contain additional values for information.

Blade passage area

Progression of the blade passage area within a channel built by two neighboring mean surfaces as well as hub and shroud. Additionally for compressible fluids the critical area can be displayed.

Isentropic Mach number

3D-Preview

3D model of the currently designed mean surface as well as surfaces of hub and shroud.

x, y frontal view

The Frontal view represents the designed mean lines in a frontal view, including diameters dH and d2.

t, m conformal mapping

The spatially curved meridional flow surfaces are mapped to a plane by coordinate transformation. This coordinate system has the angle in circumferential direction t as abscissa and the dimensionless meridional extension m as the ordinate. ¢ See t, m conformal mapping

z, T unwrapped view

Peripheral projection of all mean lines (z = axial coordinate, T = circumferential coordinate). [ Axial impellers only ]

βB blade angle

βB progression along every mean line. Too high local extreme values should be avoided if possible.

Additionally βF progression can be displayed (see display options). Those relative flow angles are calculated on the basis of the velocity triangles determined in Blade-to-blade flow 1D.

βB blade angle (meridian)

βB progression projected in meridional surface.

t wrap angle

Progression of tangential coordinate t along every mean line.

t wrap angle (meridian)

Progression of tangential coordinate t projected in meridional surface.

λ lean angle

Strike velocity

¢ See Strike velocity

Blade surface values

¢ See Blade surface values

Blade-to-blade flow 1D

¢ See Blade-to-blade flow 1D

Blade-to-blade flow 2D

¢ See Blade-to-blade flow 2D

The spatially curved meridional flow surfaces are mapped to a plane by coordinate transformation. This coordinate system has the angle in circumferential direction t as abscissa and the dimensionless meridional extension m as the ordinate.

¢ See t, m conformal mapping

Peripheral projection of all mean lines (z = axial coordinate, T = circumferential coordinate).

[ Axial impellers only ]

βB progression along every mean line.
Too high local extreme values should be avoided if possible.