Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory #002498 W2-1 BladeModeler...

Version 1.0

3/23/2007© 2007 ANSYS, Inc. All rights reserved.

Inventory #002498W2-1

BladeModeler 11.0ANSYS, Inc. Proprietary

ANSYS BladeModeler 11.0Practical 2

ANSYS BladeModeler 11.0Practical 2

Low Pressure Ratio Compressor ImpellerLow Pressure Ratio Compressor Impeller

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Training Manual

Practical #2Practical #2

• In this tutorial we will:– Input initial design

parameters– Input initial

angle/thickness parameters

– Optimize the meridional view

– Adjust the blade angle– Define the leading edge

shape

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Training Manual

LPR Compressor ImpellerLPR Compressor Impeller

Initial Design Parameters• BladeGen allows the user to create a blade system from

scratch, using one of six standard initial configuration types. For this example, a Radial Impeller is used.

1. Select the File | New | CFX-BladeGen Model menu command or toolbar button which will display the Initial Meridional Configuration Dialog

2. Select the Radial Impeller tab

3. Enter the parameters for the initial blade layout (shown on the following slide).

4. Be sure to select Ang/Thk mode in the bottom right corner

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5. Hit Enter or click Ok to continue

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Initial Angle/Thickness Parameters1. Enter the nominal wrap angle of 45

degrees, thickness of 2.5 and 13 blades, as shown on the next slide

• Normally, BladeGen sets the leading edge theta to zero.

• If the Data Direction is set to TE to LE in the User Preferences Dialog (File > Preferences), then the trailing edge theta is set to zero

2. Press Enter or select the OK button to display the BladeGen Window

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• Initial Angle/Thickness Dialog

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• BladeGen layout– Meridional and Auxialiary Views are shown

TIP: Generally, it is best to define the meridional profile before defining

the Ang/Thk or Prs/Sct views, since these views are dependent on the path length of the meridional profile

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• Optimizing the Meridional View– The most critical operation in the meridional view

is to define the shape of the hub and shroud curve– The endpoints for these curves were specified

when Initial Design Parameters were entered– The location of a point can be easily visualized by

utilizing the hover help• The bubble is displayed when the user clicks and then

holds the mouse cursor stationary (hovers) over a data point

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• When required, the location of a point can be changed in two ways:– Moving Points by Clicking and Dragging

1. Left click on the desired point and hold the mouse button

2. Move the mouse to the desired point position and release

– Moving Points by Entering new Coordinate values

1. Double click the left mouse button on the desired point2. In the location dialog box that opens, enter the desired

coordinates and click OK.

– Try moving the inlet points to horizontal = -100

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• Annotated Meridional View

• Point Location Dialog Box

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• Adjusting blade angles– The meridional profile is now defined and

the Blade angles can be set. – In the Angle View, the active layer is

indicated by a red dot in the layer column on the right-hand side. • By default, the hub layer is active.

– Once the Hub angles are set, the Shroud layer can be activated by left-clicking the black dot at the top of the layer column.

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• Define the blade angle at the hub1. Right-click in the Angle view and select Adjust

Blade Angles2. In the Leading Edge tab, enter 47º for the

Tangential Beta value, the Beta value will automatically be updated as 90º minus Tang. Beta. Leave all the other values at zero.

3. In the Trailing edge tab, enter a Theta angle of 32.2º and enter 30º for the Beta value. The Tangential Beta value will be automatically updated as 60º. All other values can remain as zero.

4. Close the Blade Angle Dialog by selecting OK

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• Adjust blade angles at the shroud– Make the shroud layer active by selecting

the black dot at the top of the layer column

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1. Right click > Adjust Blade Angles, and click on the Trailing Edge tab

2. Tangential Beta LE = 27.5

3. Theta TE = 28.94. Tangential Beta TE =

605. Click OK

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• Prescribing the Leading/Trailing Edge Shape

1. Select Blade | Properties menu commands or the toolbar button located on the left hand side of the CFX-BladeGen window to set the blade properties.

2. Set the values on Leading Edge/Trailing Edge Ellipse tab shown on the next slide

3. All other values can remain unchanged.

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• Ensure to click the ellipse location as well

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• Set the model properties:

1. Model > Properties

Ensure Units are

Set

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• Save the file

1. File > Save As or the Save As icon

2. Filename: LPR_compressor.bgd• Now go back to the Project page and open

DesignModeler (click New geometry)– Use the same units that were defined in

BladeGen (mm)

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• Click the BladeEditor icon1. Accept the default file

LCR_compressor.bgd• We want the fluid domain for a CFD analysis

2. In the Details View (lower left corner)• Change Hub Offset to 2 mm• Set Create Blades to 1• Click Generate

3. Save the model LCR_compressor.agdb

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• This concludes the tutorial• Extra things to try on your own:

1. Mesh the fluid volume in CFX-Mesh

2. Go back to BladeGen and modify the blade angles

• Save the new model with the same filename• Re-Generate the new model in

DesignModeler (just click the Generate icon!)

Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory #002498 W2-1 BladeModeler...

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Transcript of Version 1.0 3/23/2007 © 2007 ANSYS, Inc. All rights reserved. Inventory #002498 W2-1 BladeModeler...