Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-1 BladeModeler 11.0 ANSYS, Inc. Proprietary BladeModeler 11.0 Practical 6: Mixed Flow Pump Impeller

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-2 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Concepts In this tutorial we will: – Input initial design parameters – Input initial angle/thickness – Optimize the meridional view – Adjust the blade angles – Define the LE and TE edge shape – Save your work

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-3 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Initial Design Parameters CFX-BladeGen allows the user to create a blade system from scratch, using one of six standard initial configuration types. For this example, a Radial Impeller is used. – Select the File | New | CFX-BladeGen Model menu command or toolbar button which will display the Initial Meridional Configuration Dialog – Select the Radial Impeller tab – Enter the parameters for the initial blade layout (shown on the following slide). – Be sure to select Ang/Thk mode in the bottom right corner – Press Enter or select the OK button to continue

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-4 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Design Parameters Design parameters to enter for the Radial Impeller Template:

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-5 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Initial Angle/Thickness Enter Initial Angle/Thickness Parameters: – Nominal wrap angle of 100° – Thickness of 6 mm – Number of blades: 5 – Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-6 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Meridional View Optimization Optimizing the Meridional View – Inlet and Outlet location (points) have to be adjusted in order to modify the inlet and the outlet in sections and corresponding hub and shroud curves

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-7 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Inlet and Outlet Modification Double click the shroud inlet point (top left) Enter -20 and 125 for the horizontal and vertical values. Click OK. For the hub inlet point (bottom left), enter: -20 and 20 Click OK For the shroud outlet point (top right), enter: 149 and 220 Click OK For the hub outlet point (bottom right), enter: 169 and 186 Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-8 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Hub and Shroud Curve There is a need to convert hub and shroud profile curve to a more smoothly contoured shape – Left-click the hub curve in the inlet section – Right-click the mouse and select: Convert Points > Spline Curve Points… – In the Point Count Dialog, enter 3 points and click OK. – Left click and drag the resulting control point to make a smooth hub profile – Repeat this procedure for: - the hub curve in the outlet section - the shroud curve in the outlet section - the shroud curve in the blade section

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-9 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Hub-Shroud Profile at LE Define the hub-shroud profile at the leading edge – At this point, the leading and trailing edges are also piecewise linear curves. – Convert the leading edge to a 3 point spline curve and apply a slightly curved profile. – Place the middle control point at an approximate horizontal and vertical value of 31 and 74.4 You can double-click the control point to enter specific values if you wish Leave the Trailing edge as it is (linear profile) Now the meridional view is set

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-10 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Hub and Shroud Profile Curve After modifying the inlet and outlet section and the corresponding hub and shroud crves and blade profile, the meridional view looks like:

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-11 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Angles at the Hub Define the blade angle at the hub. The Hub Layer is active by default (red dot) – Right-click in the Angle view and select: Adjust Blade Angles – In the Leading Edge tab, enter 50º for the Beta value. Leave all the other values at zero. – In the Trailing Edge tab, enter a Beta angle of 60º. All other values can remain as they are – Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-12 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Angles at the Shroud Activate the Shroud Layer by clicking the black dot at the top of the layer column (it will become red) – Right-click in the Angle view and select: Adjust Blade Angles – In the Leading Edge tab, enter 75º for the Beta value. Leave all the other values at zero. – In the Trailing Edge tab, enter a Beta angle of 60º. All other values can remain as they are – Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-13 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Angle Distribution After the blade angle adjustments, the angle distribution on the hub and shroud will look like as presented below: Hub Shroud

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-14 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Profiles at Mid-Span Adjusting Blade Profiles at Mid-span Locations – It is often desirable to control the blade shape at more than just the hub and shroud locations. – To control the blade profiles at more locations, additional Layers can be generated. – In this example, an additional layer will be generated at a span location of 0.6.

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-15 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Creating Additional Layer Right-click in the Angle view and select Layer Control In the Layer Control Dialog, select Create. In the Layer Dialog, enter a span value of 0.6 and select OK. The Layer Control Dialog will now look to the right. Note that the Span 0.6 layer is checked, indicating the Angle information can be adjusted at this layer. Click OK.

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-16 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Modifications at New Layer Set the Beta Angle definition at the new layer – Select the black dot above the mid-span in the angle view to activate the new layer – Right-click in the Angle view and select: Adjust Blade Angles – Set Leading edge Beta to 70° – Set Trailing edge Beta to 60°

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-17 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Shape of Leading/Trailing Edge To prescribe the Leading/Trailing Edge Shape: – Select Blade | Properties menu commands or the toolbar button located on the left hand side of the CFX-BladeGen window to set the blade properties. – Set the values on LE/TE Ellipse tab as shown on the next slide – All other values can remain unchanged.

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-18 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Property Dialog Select LE Type to be Ellipse with the appropriate Elliptic Ratios Select TE Type to be Cut-off

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-19 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Model Properties Dialog Set the model properties: – Model > Properties Ensure Model Units are Set

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-20 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Saving the File Save the file – File > Save As or the Save As icon – Filename: MixedFlowPumpImpeller.bgd Go back to the Project page and open DesignModeler (click New geometry) – Use the same units that were defined in BladeGen (mm)

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-21 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual BladeEditor Click the BladeEditor icon – Accept the default file MixedFlowPumpImpeller.bgd – We want the fluid domain for a CFD analysis – In the Details View Change Hub Offset to 2 mm Set Create Blades to 1 Click Generate – Save the model MixedFlowPumpImpeller.agdb

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W6-22 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Suggestions for Extra Work This concludes the tutorial Extra things to try on your own: – Mesh the fluid volume in CFX-Mesh – Go back to BladeGen and modify the blade angles Save the new model with the same filename Re-Generate the new model in DesignModeler (just click the Generate icon!)