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 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 Rotor Make 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 outline Select 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 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 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 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 (360 o ). 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