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BM11_W4_AxialTurbineBlade.ppt

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BM11_W4_AXIALTURBINEBLADE
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ANSYS BladeModeler 11.0Practical 4:,Axial Turbine Blade,Concepts,In this tutorial we will:Input the initial blade settingsIn meridional view, modify the hub and shroud curvesAdjust the blade profilesCreate additional layers and modify profiles on these layersModify the blade thicknessDefine a leading and trailing edge ellipseExport the model to TurboGrid,Initial Meridional Configuration,Open BladeGen in WorkbenchClick the New Model iconSelect Normal Axial tabSelect Ang/Thk as modeEnter Parameters as shownClick OK,,,Initial Angle/Thickness Dialog,Set Nominal wrap = 5°Set Thickness = 5 mmSelect 83 bladesClick Ok,Meridional View Optimization,Optimizing the meridional viewThe most critical operation in the meridional view is to define the shape of the hub and shroud curveThe endpoints for these curves was specified when Initial Design Parameters were entered,Inlet and Outlet Modification,Defining Inlet and Outlet sectionsDouble click the shroud inlet point (top left) and enter 40 and 360 for the horizontal and vertical values. Click OKDouble click the hub inlet point (bottom left corner) and enter 40 and 254 for the horizontal and vertical values. Click OKDouble click the hub outlet point (bottom right corner) and enter 110 and 254 for the horizontal and vertical values. Click OK110 and 360 for the horizontal and vertical values. Click OK,Blade Hub and Shroud Curves,Adjusting Blade Hub and Shroud CurveBy default, BladeGen creates the blade’s hub and shroud curves as curves with 5 control points For this example, a single straight edge is required Therefore, we can convert this curve to two control points Left-click the blade’s hub curveRight-click the mouse and select Convert Points to.. > Spline Curve Points…In the Point Count Dialog, enter 2 points and select OKRepeat this procedure for the blade’s shroud curve,Blade Angles at Shroud,Adjusting Blade Angles at the Shroud in the Angle ViewIn the Angle View, make the Shroud layer active by selecting the black dot at the top of the layer columnIt will turn red and the Shroud is now activeRight-click in the Angle view and select Adjust Blade AnglesIn the Leading Edge tab, enter -4.65o for the Beta value. Enter -2.5o for the Theta valueThe Tang Beta value will automatically be updated as 90o minus BetaIn the Trailing edge tab, enter a Theta angle of 2.15o and enter 70.10o for the Beta valueThe Tangential Beta value will be automatically updated as 19.90o. All other values can remain as zeroClose the Blade Angle Dialog by selecting OK,Shroud Beta Profile,Adjusting the Shroud Beta ProfileIn this example, simply setting the blade angles did not create the exact profile desired The Beta curve needs further modification to create desirable profile The blade angles can be further modified as follows;Right-click in the Angle view and select Beta DefinitionRight-click the mouse a second time in the Angle view and select Convert Points to.. > Spline Curve Points…In the Point Count Dialog, enter 5 points and select OKModify the control points by dragging them with the left mouse button so that the beta curve looks similar to the figure on the following page,Distribution of Angles at Shroud,Blade Profiles at Mid-Span,Adjusting Blade Profiles at Mid-span LocationsIt is often desirable to control the blade shape at more than just the hub and shroud locations To control the blade profiles at more locations, additional Layers can be activated or generated In this example, the layer generated at a span location of 0.5 will be used,Additional Layer,Activating an Additional LayerRight-click in the Angle view and select Layer Control..Click the empty box to the left of Span 0.500 to select the layerSelect OKSet the Beta definition at the new Layer Make the new layer active by select the new black dot at the mid-span location of the layer column. After you have selected it, the dot will turn redAdjust the Blade Angles on the new layer (Right click in Angle View > Adjust Blade Angles):,Distribution of Angles at New Layer,In the Leading Edge tab, enter -40.7o for the Beta value and enter -1.5o for the Theta valueIn the Trailing edge tab, enter a Theta angle of 2.74o and enter 66.88o for the Beta valueShape the Beta curve as shown,Hub Blade Angles,Adjusting the Hub Blade AnglesMake the Hub layer active by selecting the black dot at the bottom of the layer columnSet the leading edge Beta value of -67o and a trailing edge value of 42oShape the Beta curve similar to the shroud and midspan curves,Blade Thickness Profile,Defining the Blade Thickness profileBy default, BladeGen assumes that the blade thickness profile is uniform from hub to shroud If you try to make some thickness modifications at any layer other than the hub the warning message below appearsIf the blade thickness is to be non-uniform from hub to shroud, additional layers must be activated:Right-click in the Thickness view and select Layer Control…In the Layer Control Dialogue, check the box beside the layer at Span: 1.000 and Span: 0.500Select OK,,Blade Thickness at Shroud,Defining the Blade Thickness at the ShroudSelect the Shroud Layer in the Thickness viewRight-click the mouse in the Thickness view and select Convert Points to.. > Spline Curve Points…In the Point Count Dialog, enter 3 points and select OKSet the Leading edge thickness to 1.25mm by double-clicking the leading edge point and entering a thickness of 1.25mmSet the Trailing edge thickness to 0.50mmDouble-click the middle point and set the thickness to 3.25. The Meridional position can also be adjusted by setting the M value to 9,Creating a Thickness Profile,Now, extra control points can be added to create the profile as shown on the following page:Right-click the mouse in the Thickness view and select Segment Operations.. > Insert Many Points…Click to create the new point to one of the locations indicated by the black arrows in the figure on the following pageDon’t worry about getting the locations perfect, this can be tweaked once all of the new points have been addedRepeat this process for the other point locationsAfter you have added all 4 points, Right-click the mouse and select Segment Operations.. > Insert Many Points… again to finish adding pointsClick and drag to modify any of the new point locations as required,Blade Thickness at Shroud,Blade Thickness at Mid-Span,Defining the Blade Thickness at Span 0.5Click on the black dot in the middle of the Layer Column in the Thickness view to make the span 0.5 layer activeConvert the Thickness curve to a spline with 3 Control PointsSet the Leading Edge to 1.1mm thickness, trailing edge to 0.5mm and the middle control point to a thickness of 5.5 at a Meridional distance of 9.0Create 4 extra control points as described previously to create a similar profile as shown above,Blade Thickness at Hub,Defining the Blade Thickness at the HubClick on the black dot at the bottom of the Layer Column in the Thickness view to make the hub layer activeConvert the Thickness curve to a spline with 3 Control PointsSet the Leading Edge to 1.0 mm thickness, trailing edge to 0.5mm and the middle control point to a thickness of 6.5 at a Meridional distance of 18Create 4 extra control points to create a similar profile to those at the shroud and midspanHINT: Right click on Thickness View > Show Curve for Each Defining Layer,Type of LE and TE,Select Blade > Properties menu commands or the toolbar button located on the left hand side of the CFX-BladeGen window to set the blade propertiesSet the LE/TE Ellipse tab, adjust the values as shown All other values can remain unchanged,Prescribing the Leading/Trailing Edge Ellipse,Custom Output Layers,Adding Custom Output LayersA layer (streamline) is defined as a meridional curve that represents surface of revolutionSo far, layers have been used to control the blade angles and thickness profilesLayers are also used for controlling the output from BladeGen In this case, we want to add additional output layers to have a better blade definition for TurboGridFor more detailed information, see the User’s Guide,Additional Output Layers,Creating Additional Output Layers at Constant Span LocationsRight-click the mouse in the Angle View and select Layer Control… from the pop-up menuSelect the Output tab and click the Create buttonIn the Layer Dialog, enter a span value of 0.05 and click OKRepeat this procedure for span values of 0.1 and 0.125Click OK to close the Layer Control Dialog,Additional Output Layers,Right-click the mouse in the Angle View and select Layer Control… from the pop-up menuSelect the Output tab and click the Create buttonIn the Layer Dialog, click the Shr Gap tab and enter LE gap of 4 and a TE gap of 3 as shownClick OK,Creating an Additional Output Layer at a Variable Span LocationLayers can also be generated at variable span locations as follows:,Output Layers Verification,Verifying the Output LayersUnder the Layer Control Dialog Box, ensure all output layers are selected,Saving the Geomtery,Setting the unitsNavigate to Model > PropertiesSet units to mmClick OkSaving the geometryClick the Save as iconName the file Axial_Turbine_1.bgd,Export the Geometry,Exporting the geometry to TurboGridClick the TurboGrid Input Files iconAccept the default filenames,Suggestions for Additional Work,On your own:Try creating a mesh in TurboGrid using the .curve files generatedUse BladeEditor to import the .bgd file into DesignModeler, and then create a mesh using CFX meshUse CFX Post to compare the two meshes createdCheck quality metrics like minimum angle and edge to length ratio,
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