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

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-85/1/2006© 2006 ANSYS, Inc.

Geometry Imported into BladeGen

Meridonal View Blade to Blade View

Thickness ViewAngle View

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-105/1/2006© 2006 ANSYS, Inc.

Modify Blade Thickness

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

2006 International ANSYS ConferenceInventory #002307

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

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-145/1/2006© 2006 ANSYS, Inc.

DesignModeler

Next, we will create the blade geometry using BladeEditor.

Click New geometry on the project page

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-155/1/2006© 2006 ANSYS, Inc.

DesignModeler

Select mm as the unit type:

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-175/1/2006© 2006 ANSYS, Inc.

BladeEditor

In the details view:– Change Hub Offset to 2

Click Generate

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

WS20-185/1/2006© 2006 ANSYS, Inc.

BladeEditor

Impeller Geometry Created– Solid Part

– Fluid Domain

Workshop

ANSYS v11.0

2006 International ANSYS ConferenceInventory #002307

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