2006 International ANSYS Conference BladeModeler Demonstration Creating a Centrifugal Compressor...

2006 International ANSYS Conference

BladeModeler Demonstration

Creating a Centrifugal Compressor Impeller

Workshop 20

ANSYS CFX 11.0

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-25/1/2006© 2006 ANSYS, Inc.

BladeModeler

In this demonstration, you will:– Create a centrifugal compressor impeller

– Export the necessary files for TurboGrid

– Add fillets to the impeller solid

Workshop

ANSYS v11.0


WS20-35/1/2006© 2006 ANSYS, Inc.

About BladeModeler

BladeModeler is a new blade geometry creation product (Windows OS only) that consists of three components:

– BladeGen – Blade creation and editing tool

– DesignModeler – Workbench CAD solid modeler

– BladeEditor – Add-In to DesignModeler that can import and convert BladeGen geometry into a solid model

BladeModelerBladeModeler

BladeGenBladeGen DesignModelerDesignModeler

BladeEditorBladeEditor

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ANSYS v11.0


WS20-45/1/2006© 2006 ANSYS, Inc.

Starting BladeModeler

Start Workbench– Start > Programs > ANSYS 11.0 > ANSYS

Workbench

– On the Start Page, select Blade Geometry

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ANSYS v11.0


WS20-55/1/2006© 2006 ANSYS, Inc.

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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ANSYS v11.0


WS20-65/1/2006© 2006 ANSYS, Inc.

Vista CCD design

Switch to the Compressor Duty tab– Set overall pressure ratio to 4

– Set rotational speed to 80 000 rpm

– Click Calculate

Meridional view updates after calculate

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ANSYS v11.0


WS20-75/1/2006© 2006 ANSYS, Inc.

Splitter Blade

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

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ANSYS v11.0


WS20-85/1/2006© 2006 ANSYS, Inc.

Geometry Imported into BladeGen

Meridonal View Blade to Blade View

Thickness ViewAngle View

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ANSYS v11.0


WS20-95/1/2006© 2006 ANSYS, Inc.

Modify Blade Thickness

Modify the Blade Thickness at the shroud

Click this dot to switch to the shroud profile

Drag this line to 0.7

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ANSYS v11.0


WS20-105/1/2006© 2006 ANSYS, Inc.

Modify Blade Thickness

Thickness profile and blade to blade view should now look like this:

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ANSYS v11.0


WS20-115/1/2006© 2006 ANSYS, Inc.

Join Hub Curve

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

– Right click > Segment Operations > Join Segment at Point

Point to Select

Workshop

ANSYS v11.0


WS20-125/1/2006© 2006 ANSYS, Inc.

Create TurboGrid Files

TurboGrid is used to create a high quality, hexahedral mesh for CFD

Export the data for TurboGrid– File > Export > TurboGrid Input Files…

– Four TurboGrid files will be created

• .inf file containing machine info

• Hub, shroud, and profile curve files

– Click OK to write the files

See TurboGrid demonstration for more details on the power of using TurboGrid!

Workshop

ANSYS v11.0


WS20-135/1/2006© 2006 ANSYS, Inc.

Save the Blade Design

Click File > Save to save the geometry

Switch back to the Project tab

Save the Workbench project– File > Save As

– Filename: Impeller1.wbdb

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ANSYS v11.0


WS20-145/1/2006© 2006 ANSYS, Inc.

DesignModeler

Next, we will create the blade geometry using BladeEditor.

Click New geometry on the project page

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ANSYS v11.0


WS20-165/1/2006© 2006 ANSYS, Inc.

BladeEditor

Click the BladeEditor icon

The file Impeller1.bgd should appear in the open window by default

Select OK

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ANSYS v11.0


WS20-175/1/2006© 2006 ANSYS, Inc.

BladeEditor

In the details view:– Change Hub Offset to 2

Click Generate

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ANSYS v11.0


WS20-185/1/2006© 2006 ANSYS, Inc.

BladeEditor

Impeller Geometry Created– Solid Part

– Fluid Domain

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ANSYS v11.0


WS20-195/1/2006© 2006 ANSYS, Inc.

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

2006 International ANSYS Conference BladeModeler Demonstration Creating a Centrifugal Compressor...

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