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15 m Wind Tunnel — Final Year Project

Cheat sheet

Printable study sheet: formulas → definitions → topic notes → traps.

Formulas

Continuity A1V1=A2V2

q=½ρV²

Continuity in contraction: A1 V1 = A2 V2 (incompressible)

Dynamic pressure q = ½ ρ V²

Definitions

Contraction ratio: Settling/test area ratio
Flat pattern: Sheet unfold for fab
Flat pattern / BOM: Sheet-metal unfold + costed parts list from Creo

Topic-wise short notes

Study these first — one block per syllabus topic. Then read the deep notes below.

Design & fab

Creo Sheet Metal → shear/bend/weld; BOM costing.

Exam traps & quick notes

Creo Sheet Metal → flats/BOM → hydraulic shear, precision bend, weld. Full fab ownership.
Flow quality + manufacturable flats dominate student tunnels.

Comprehensive notes

Design & fabrication

15 m sheet-metal wind tunnel designed in Creo Sheet Metal Modelling with flat patterns and BOM costing; fabricated via shearing, bending, welding. Interview: flow quality needs + DFMA of large sheet assemblies.

External: Engineering Toolbox ↗

Interview Q&A — Wind tunnel

Q. What engineering problems dominate a student wind tunnel?

Uniformity and turbulence in the test section, structural stiffness of long ducts, sealed joints, and manufacturable flat patterns — not only “pretty CAD.”

External: Engineering Toolbox ↗