Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-1 BladeModeler 11.0 ANSYS, Inc. Proprietary ANSYS BladeModeler 11.0 Practical 3 Axial Fan Blade

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-2 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Concepts In this tutorial involving an axial fan, we will: – Input the initial blade settings – Modify the hub curve – Adjust the blade profiles – Create an additional layer – Modify the blade thickness – Use BladeEditor to bring the geometry into DesignModeler – Create a fillet on the hub surface

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-3 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Initial Meridional Configuration 1.Open BladeGen in Workbench 2.Click the New Model icon 3.Select Normal Axial tab 4.Enter Parameters as shown 5.Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-4 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Angle/Thickness Dialog 1.Set Nominal wrap = 35° 2.Set Thickness = 2.5 mm 3.Select 9 under #Blades 4.Click Ok

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-5 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Modification in Meridional Plane Defining inlet and outlet sections – The hub and shroud definitions upsteam and downstream of the blade can be defined when : the user will be performing CFD analysis on the proposed design Simply to have the BladeGen hub and shroud geometry more completely represent the final design Inlet Outlet

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-6 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Adjustment of Inlet and Outlet 1.Double click the shroud inlet point (top left) – The Point Location Dialogue will open Horizontal value = Axial location (Z co-ordinate) Vertical value represents the Radius Enter and 132 for the horizontal and vertical values. Click OK 2.Double click the hub inlet point (bottom left corner) and enter and 30 for the horizontal and vertical values. Click OK 3.Double click the hub outlet point (bottom right corner) and enter 70 and 52.8 for the horizontal and vertical values. Click OK 4.Double click the shroud outlet point (top right corner) and enter 70 and 132 for the horizontal and vertical values. Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-7 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Adjusting Hub Curve Adjusting the hub curve – After adjusting the inlet and outlet points, the hub upstream of the blade is a piece-wise linear curve at an abrupt angle – To improve the profile of the hub, this curve will be converted to a more smoothly contoured shape

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-8 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Hub Curve Adjustment Adjust the inlet hub curve 1.Left-click the hub curve in the inlet section 2.Right-click the mouse and select Convert Points to.. Spline Curve Points… 3.In the Point Count Dialog, enter 3 points and select OK 4.Left-click and drag the resulting control point to make a smooth hub profile 5.Your Meridional view should now look as shown in the previous slide 6.If you would like more practice, repeat this procedure on the Hub curve at the base of the blade

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-9 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Points on the Hub and Shroud 1.Move the points on the hub and shroud at the leading and trailing edge away from the blade – This will help for filleting the geometry later

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-10 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Hub-Shroud Profile at LE Defining the hub-shroud profile at the leading edge – At this point, the leading and trailing edges are also piecewise linear curves. 1.Convert the leading edge to a 3 point spline curve and apply a slightly curved profile. 2.Place the middle control point at an approximate horizontal and vertical value of 1.5 and 98 – You can double-click the control point to enter specific values if you wish – Now the meridional view is set Next we will adjust the blade angles at the shroud

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-11 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Modify Beta Angle at Shroud Shroud Layer 1.Activate the shroud layer in the Angle view (click the top black dot just to the right of the plot) 2.In the Angle view, Right click > Beta Definition 3.Right click > Convert Points to > Spline Curve Points … 4.In the Point Count Dialog, enter 2 points and select OK 5.Double click on the Leading edge point and set (M-Prime = 0) = 83° 6.Double click on the Trailing edge point and set (M-Prime = 0.098) = 61°

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-12 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 # W3-13 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Creating Additional Layer Creating an Additional Layer 1.Right-click in the Angle view and select Layer Control.. 2.In the Layer Control Dialog, select Create 3.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. 4. Click OK

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-14 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Modifications at the New Layer Setting the Beta definition at the new layer 1.Select the black dot at midspan in the angle view 2.Set leading edge Beta angle to 80° 3.Set trailing edge Beta angle to 57° Adjust Hub Blade angles as well 1.Set leading edge Beta to 67° 2.Set trailing edge Beta to 42°

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-15 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Thickness Profile Defining blade thickness profile – By default, BladeGen assumes uniform thickness from hub to shroud 1.To override this, right click on the thickness view, and select Layer Control… 2.On the Thk Crv tab, check 0.6 and 1 to allow thickness settings at these layers, click Ok 3.Click on the shroud layer (top black dot) 4.Convert the curve to a 3 point spline 5.Set the leading edge thickness to 2 mm 6.Set the trailing edge thickness to mm 7.Adjust the middle point to make an arc

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-16 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Thickness at New Layer Defining the thickness at 0.6 span 1.Convert the curve to a spline with 5 control points 2.Set LE thickness = 3 mm 3.Set TE thickness = mm 4.Move the 3 internal control points to make an S shape to the blade as shown to the right

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-17 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Blade Thickness at Hub Defining blade thickness at the hub 1.Set the thickness view to the hub layer 2.Conver the curve to a spline with 5 control point 3.Set LE thickness = 4mm 4.Set TE thickness = 1.25 mm 5.Rearrange the control points to create an S shape similar to the previous slide

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-18 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Type of LE and TE Setting the Leading and Trailing edge shape 1.Blade > Properties 2.Set Both to ellipses – using values below

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-19 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Solid Model Generating the solid model 1.Save the model properties (units mm) 2.Save the file axialfan.bgd 3.Switch to the Project page in Workbench 4.Launch DesignModeler by selecting New Geometry (units mm) 5.Use Blade Editor to open axialfan.bgd

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-20 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Solid Model In this case, we only want the solid model In the Details View: 1.Set Hub Offset to Set Create Fluid Zone to “No” then

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory # W3-21 BladeModeler 11.0 ANSYS, Inc. Proprietary Training Manual Suggestions for Additional Work On your own: Try the following in DesignModeler: 1.Create a 2 mm fillet between the blades and the hub 2.Hollow out the hub to a thickness of 2.5 mm 3.Add some ribs to the inside of the hub