ANSYS CFX 11.0 BladeModeler Demonstration Creating a Centrifugal Compressor Impeller
A NSYS v 11.0 BladeModeler In this demonstration, you will: –
Create a centrifugal compressor impeller
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Export the necessary files for TurboGrid
– Add fillets to the impeller impeller solid
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A NSYS v 11.0 A b o u t B l a d e M o d e l er
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BladeModeler is a new blade geometry creation product (Windows OS only) that consists of three components: –
BladeGen – Blade creation and editing tool
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DesignModeler – Workbench CAD solid modeler
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BladeEditor – Add-In to DesignModeler that can import and convert BladeGen geometry into a solid model
BladeModeler BladeGen
DesignModeler BladeEditor
A NSYS v 11.0 S t ar t i n g B l a d e M o d e l er Start Workbench –
Start > Programs > ANSYS 11.0 > ANSYS Workbench
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On the Start Page, select Blade Geometry
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A NSYS v 11.0 Vista CCD A new feature of BladeModeler is the Vista 1D design codes –
To use the compressor design code, select File > New > Vista Centrifugal Compressor Design
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A NSYS v 11.0 V i s t a C CD d e s i g n
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Switch to the Compressor Duty tab –
Set overall pressure ratio to 4
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Set rotational speed to 80 000 rpm
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Click Calculate
Meridional view updates after calculate
A NSYS v 11.0 Splitter Blade
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Note on the Geometry and Inlet Gas Angles tab, the number of intervanes is equal to the number of main blades –
This means our impeller will have one splitter blade per passage
Click New Model to build the model When prompted, save geometry as filename impeller1.bgd
A NSYS v 11.0 G eo m e t r y Im p o r t e d i n t o B l a d e G en
Meridonal View
Angle View
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Blade to Blade View
Thickness View
A NSYS v 11.0 M o d i f y B l ad e T h i c k n e s s
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Modify the Blade Thickness at the shroud
Click this dot to switch to the shroud profile
Drag this line to 0.7
A NSYS v 11.0 M o d i f y B l ad e T h i c k n e s s Thickness profile and blade to blade view should now look like this:
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A NSYS v 11.0 Join Hub Curve
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To facilitate creating a fillet in DesignModeler, join the middle and downstream hub segments: –
Select the point at the intersection of the hub and trailing edge in the meridional view
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Right click > Segment Operations > Join Segment at Point
Point to Select
A NSYS v 11.0 Create Turbo Grid Files TurboGrid is used to create a high quality, hexahedral mesh for CFD Export the data for TurboGrid –
File > Export > TurboGrid Input Files…
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Four TurboGrid files will be created • .inf file containing machine info • Hub, shroud, and profile curve files
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Click OK to write the files
See TurboGrid demonstration for more details on the power of using TurboGrid!
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A NSYS v 11.0 Save the Blade Design Click File > Save to save the geometry Switch back to the Project tab Save the Workbench project –
File > Save As
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Filename: Impeller1.wbdb
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A NSYS v 11.0 DesignModeler Next, we will create the blade geometry using BladeEditor. Click New geometry on the project page
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A NSYS v 11.0 DesignModeler Select mm as the unit type:
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A NSYS v 11.0 BladeEditor Click the BladeEditor icon
The file Impeller1.bgd should appear in the open window by default Select OK
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A NSYS v 11.0 BladeEditor In the details view: –
Change Hub Offset to 2
Click Generate
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A NSYS v 11.0 BladeEditor
Impeller Geometry Created –
Solid Part
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Fluid Domain
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A NSYS v 11.0 DesignModeler The solid geometry could be sent to Simulation for structural analysis The fluid domain could be sent to CFX-Mesh or ICEM for meshing Try on your own: – Add a fillet to the blade –
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