modeling the turbine blades

8/6/2019 Modeling the Turbine Blades

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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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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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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


6/18Ken Youssefi Engineering 10, SJSU 6

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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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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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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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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Modeling the Turbine Rotor Loft Command

The two profiles

Click the Lofticon

Select the two sections


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Modeling the Turbine Rotor Bring back the hub byunsuppressing the extrusion

Right click the Extrusionand pick the UnsuppressFeatures


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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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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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The Three-Blade turbine rotor

Rendered model


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2 to 5 Blade Turbine Rotors

modeling the turbine blades

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