Ansys - WS20_BladeModeler

2006 International ANSYS Conference

Workshop 20

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

 –

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

 –

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

 –

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  –

Modify the hub inlet

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