Ken Youssefi Engineering 10, SJSU 1 The Blade Shape Design groups should conduct a thorough search...

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Ken Youssefi Engineering 10, SJSU 1 The Blade Shape Design groups should conduct a thorough search of the internet to obtain information on turbine rotor blade design and efficiency. Based on your research, 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 not exceed .25 inch or 6.35 mm. The tutorial in the following slides is based on the blade geometry and shape shown below. .7 in (18 mm) .25 (6.35 mm) 2.5 in. (63.5 mm)
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Transcript of Ken Youssefi Engineering 10, SJSU 1 The Blade Shape Design groups should conduct a thorough search...

Ken Youssefi Engineering 10, SJSU 1

The Blade ShapeDesign groups should conduct a thorough search of the internet to obtain information on turbine rotor blade design and efficiency. Based on your research, 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 not exceed .25 inch or 6.35 mm.

The tutorial in the following slides is based on the blade geometry and shape shown below.

.7 in (18 mm)

.25 (6.35 mm)2.5 in. (63.5 mm)

Ken Youssefi Engineering 10, SJSU 2

The Plan

Decide on the angle of attack near the tip, number of stations, and the profile (size) for each station.

Construct work planes to sketch the profiles (stations) of the blade.

Sketch the profiles according to your design.

Use the Loft command to create the blade by sweeping and blending the profiles.

Smooth the edges of the blade.

Finish the Turbine Rotor by generating the desired number of blades (circular pattern).

Decide on the number of the blades to use.

Ken Youssefi Engineering 10, SJSU 3

Modeling the Turbine Rotor

Start Inventor and open the provided Hub file, blade_hub_seed_D15SEP07

Make the YZ plane visible

Open the Origin file (click the +)

Right click the YZ plane and select the Visibility option

YZ plane

Example hub for this tutorial

Ken Youssefi Engineering 10, SJSU 4

Modeling the Turbine RotorMake an offset plane, 6.25 distance from the YZ plane

Click Work Plane icon, select the YZ plane, drag and input the value for the offset

Project the hub to have a reference for drawing the profile

Select Project Geometry and pick the hub

Projected outlineSelect hub

Enter 2D Sketch mode to draw the first profile of the blade

Click 2D Sketch icon and select the work plane just created

Ken Youssefi Engineering 10, SJSU 5

Modeling the Turbine Rotor – Sketching the First Profile

Suppress the hub to unclutter the screen

Select the Extrusion feature and right click

Select the Suppress Features

Ken Youssefi Engineering 10, SJSU 6

Modeling the Turbine Rotor – Sketching the First Profile

Draw a line between the midpoints of the projected geometry

After suppressing the hub, edit the sketch

midpoint

midpoint

Offset this line to both sides, dimension the offset 9 mm on both sides

Result of the offset

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 Spline command

Choose three points. After the third point, right click and select Create

Point 1, snap to the end of the line

Point 2 is selected arbitrary, this point determines the shape of the profile

Point 3, snap to the end of the line

Ken Youssefi Engineering 10, SJSU 8

Modeling the Turbine Rotor – Sketching the Second Profile

Delete the construction lines Create an offset work plane at 63.5 mm distance. This plane will be used to create the second profile

Click the Work Plane icon, select the first profile plane, drag and input the offset

Ken Youssefi Engineering 10, SJSU 9

Modeling the Turbine Rotor – Sketching the Second Profile

Work plane for the second profile

Select 2D Sketch and choose the work plane

Draw a line 9 mm long from the origin

Origin

Construct a spline, same as the first profile

Ken Youssefi Engineering 10, SJSU 10

Modeling the Turbine Rotor – Loft Command

The two profiles

Click the Loft icon

Select the two sections

Ken Youssefi Engineering 10, SJSU 11

Modeling the Turbine Rotor – Loft Command

Select first profile

Select second profile

Ken Youssefi Engineering 10, SJSU 12

Modeling the Turbine Rotor

Bring back the hub by unsuppressing the extrusion

Right click the Extrusion and pick the Unsuppress Features

Ken Youssefi Engineering 10, SJSU 13

Modeling the Turbine Rotor – Rounding Edges (Fillet)

Click the Shaded Display to view the hub and one blade

Click the Fillet icon

Make sure you select Constant Fillet option (constant radius)

Select an edge and assign a fillet radius

Ken Youssefi Engineering 10, SJSU 14

Modeling the Turbine Rotor – Rounding Edges (Fillet)

Select the front and back edges of the blade and assign values of .3 and .15 respectably.

.3 mm fillet .15 mm fillet

Select the common edge between the hub and the blade, assign a value of .3 mm for the fillet.

.3 mm fillet

Ken Youssefi Engineering 10, SJSU 15

Modeling the Turbine Rotor – Creating More BladesEach design group is responsible for deciding on how many blades to use. The size of the hub dictates the maximum number of blades. Your selection must fall between 2 to 5 blades.

Click the Features icon and select the blade

Three blade turbine rotor

Click the Circular Pattern icon

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 the pattern (3) and the spread of the pattern (360o).

Direction of the pattern generated

Ken Youssefi Engineering 10, SJSU 17

The Three-Blade turbine rotor

Rendered model

Ken Youssefi Engineering 10, SJSU 18

2 to 5 Blade Turbine Rotors