### 10.3.5. Blade Section (Airfoil Design Mode) Sub-feature

The blade section definitions enable you to view/edit the airfoil input data on each defining layer. The Blade Section sub-features appear under the Blade feature in the tree view. By selecting a section definition, it becomes visible for editing in the Section View (for details on showing this view, see Section Definition View), and the section properties become visible in the details view. When a new Blade airfoil design mode feature is first created, the section details are not available until valid FlowPath and LE/TE contours are selected. Once these are selected, blade sections are automatically defined for all layers in the FlowPath.

The Blade Section sub-feature properties are as follows (Note that angles are in degrees and lengths are in the length unit used in the active session of Blade Editor.):

Details of [Sub-feature Name]
Section | [Name of Section] (for information only)
Layer | [Index Value] (for information only)
Details of Dimensions
StaggerAngle | The angle between the M axis and the stagger line.
MajorLERadius | Half the length of the LE ellipse's major axis, which is the axis that is at an angle of LEBeta with respect to the M axis.
MinorLERadius | Half the length of the LE ellipse's minor axis.
LESSWedgeAngle | Angle between the major axis of the LE ellipse and the line of tangency on the LE ellipse at the point where the LE suction side curve contacts the LE ellipse. Note that this line of tangency on the LE ellipse is also a line of tangency to the LE suction side curve at the LE end of that curve. Note also that the value of LESSWedgeAngle affects the location of the point where the LE suction side curve contacts the LE ellipse.
LEPSWedgeAngle | Angle between the major axis of the LE ellipse and the line of tangency on the LE ellipse at the point where the pressure side curve contacts the LE ellipse. Note that this line of tangency on the LE ellipse is also a line of tangency to the pressure side curve at the LE end of that curve. Note also that the value of LEPSWedgeAngle affects the location of the point where the pressure side curve contacts the LE ellipse.
LEBeta | Angle between the major axis of the LE ellipse and the M axis.
TEBeta | Angle between the major axis of the TE ellipse and the M axis.
ThroatWidth | Length of the throat line (the specified throat, not the calculated throat).
SSThroatAngle | Angle between the throat line and the R*Theta axis.
MajorTERadius | Half the length of the TE ellipse's major axis, which is the axis that is at an angle of TEBeta with respect to the M axis.
MinorTERadius | Half the length of the TE ellipse's minor axis.
TEHalfWedgeAngle | Half the TE wedge angle.

These Blade Section Sub-feature properties, in conjunction with the sketch template, define the airfoil shape. The blade section template, as applied to an example blade section, is shown in the following figures: Figure 10.7: Blade Section Sketch Template, Figure 10.8: Blade Section Sketch Template: Details in Leading Edge Region, Figure 10.9: Blade Section Sketch Template: Details in Trailing Edge Region.

In these figures, the red “asterisk” symbols represent control points for the Bezier curves. Note that each end of the stagger line (that is, the chord line) is at an intersection of the major axis of an ellipse and the ellipse itself. Note that the R*Theta axis is tangent to the blade. The M axis is at the intersection of the R*Theta axis and the extended major axis of the leading edge ellipse.

Figure 10.7: Blade Section Sketch Template

Figure 10.8: Blade Section Sketch Template: Details in Leading Edge Region

Figure 10.9: Blade Section Sketch Template: Details in Trailing Edge Region

The Blade Section Sub-feature properties can be parameterized as for other properties in DesignModeler. For details, see Creating Parameters in the ANSYS DesignModeler User's Guide.

When the sections are first created, the dimensions are scaled to the meridional chord defined by the LE/TE contours.

To edit the airfoil shapes and stacking arrangement, use the Section and Stacking views, respectively. For details, see Section Definition and Stacking Views. You can see the curvature of an airfoil section via the Curvature view. For details, see Curvature View.

After modifying one of the blade sections, but before regenerating the blade, the graphics window displays the blade sections and the curve that passes through the Section Reference Location of each blade section. Note that the Theta-versus-span distribution of this curve follows the relation given by the stacking curve (see Section Stacking View).

Release 18.2 - © ANSYS, Inc. All rights reserved.