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Ken Youssefi Engineering 10, SJSU 1
The Blade Shape Design groups should conduct a thorough search of the internet to obtaininformation on turbine rotor blade design and efficiency. Based on yourresearch, decide on the number and general shape of the blade.
Constraints:
Total diameter of the Turbine Rotor (diameter of the swept area)must not exceed 6 inches or 152.4 mm.The thickness is limited by the height of the Hub. It should notexceed .25 inch or 6.35 mm.
The tutorial in the following slides is based on the blade geometry and shapeshown below.
.7 in (18 mm)
.25 (6.35 mm)
2 .5 i n. ( 6 3 .5 mm)
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Ken Youssefi Engineering 10, SJSU 3
Modeling the Turbine Rotor
Start Inventor and open theprovided Hub file,blade_hub_seed_D15SEP07
Make the YZ plane visible
Open the Origin file (click the +)
Right click theYZ plane andselect the
Visibility option
YZ plane
Example hubfor this tutorial
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8/6/2019 Modeling the Turbine Blades
5/18Ken Youssefi Engineering 10, SJSU 5
Modeling the Turbine Rotor Sketching the First Profile
Suppress the hub to
unclutter the screen
Select theExtrusion
feature andright click
Select theSuppressFeatures
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Modeling the Turbine Rotor Sketching the First Profile
Draw a line between themidpoints of the projectedgeometry
After suppressing the hub, edit the sketch
midpoint
midpoint
Offset this line to bothsides, dimension theoffset 9 mm on bothsides
Result of the offset
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Ken Youssefi Engineering 10, SJSU 7
Modeling the Turbine Rotor Sketching the First Profile Draw a diagonal line, make sure
you snap to the intersection
Select the Splinecommand
Choose three points. After the thirdpoint, right click and select Create
Point 1, snap to the endof the line
Point 2 is selected arbitrary,
this point determines theshape of the profile
Point 3, snap to the endof the line
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Ken Youssefi Engineering 10, SJSU 8
Modeling the Turbine Rotor Sketching the Second Profile
Delete the construction linesCreate an offset work plane at 63.5 mmdistance. This plane will be used tocreate the second profile
Click the Work Plane icon, selectthe first profile plane, drag andinput the offset
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Ken Youssefi Engineering 10, SJSU 9
Modeling the Turbine Rotor Sketching the Second Profile
Work plane for thesecond profile
Select 2D Sketch andchoose the work plane
Draw a line 9 mm longfrom the origin
Origin
Construct a spline,same as the first profile
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Ken Youssefi Engineering 10, SJSU 10
Modeling the Turbine Rotor Loft Command
The two profiles
Click the Lofticon
Select the two sections
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Ken Youssefi Engineering 10, SJSU 12
Modeling the Turbine Rotor Bring back the hub byunsuppressing the extrusion
Right click the Extrusionand pick the UnsuppressFeatures
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Ken Youssefi Engineering 10, SJSU 15
Modeling the Turbine Rotor Creating More Blades Each design group is responsible for deciding on how many blades to use.
The size of the hub dictates the maximum number of blades. Your selectionmust fall between 2 to 5 blades.
Click the Featuresicon and select theblade
Three blade turbinerotor
Click the CircularPattern icon
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Ken Youssefi Engineering 10, SJSU 16
Modeling the Turbine Rotor Creating More Blades
Click the Rotation Axis icon and
select the center hole.
Input the number of feature in thepattern (3) and the spread of thepattern (360 o).
Direction of thepattern generated
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Ken Youssefi Engineering 10, SJSU 17
The Three-Blade turbine rotor
Rendered model
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Ken Youssefi Engineering 10, SJSU 18
2 to 5 Blade Turbine Rotors