1. S. Clardy Henderson State University, Arkadelphia, AR DESIGNING AND BUILDING A LOW-COST, LAMINAR FLOW WIND TUNNEL

2. The purpose of this study was to design and build a “small scale” wind tunnel (net length is approx. 20 ft – test chamber length is 3 ft) in which experimenters can reliably determine the turbulent effects from the wing itself versus effects created by the wind tunnel design and the medium used to view the turbulent flow. Partnership in Light Sport Aircraft to study potential new wing designs to reduce vortices MOTIVATION

3. Cost Designed to be built for under $5000 Facility Layout Placed in a 6’x24’ room Hallway considerations PROJECT CONSTRAINTS Hallway Wind Tunnel Room Classroom Shop

4. OPEN RETURN VS. CLOSED RETURN SYSTEMS

5. OPEN DESIGN WITH SEMI-CLOSED EFFECTS DUE TO PLACEMENT Hallway Wind Tunnel Room Classroom Shop

6. OUR WINDTUNNEL

7. Shape determined by 5 th order Bell-Metha polynomials 1 Y is the height, x is horizontal distance, L is the total axial length (4ft) Using boundary condition a= -7.5 b=18.75 c=-12.5 d=0 e=0 f=2 THE NOZZLE 1. Justin Pereira, ed. Wind Tunnels: Aerodynamics, Models, and Experiments. Nova Science Publishers, Inc., 2011, Ch 7.

8. THE VIEWING CHAMBER 18”x18”x36” ½” plexiglass Center and wall mounting systems Sample size: 14.4” across the chamber

9. THE DIFFUSER

10. Nozzle Fiberglass Cast in 2 halves Mold created from wood and foam Diffuser Fiberglass Cast in 2 halves (length-wise) Mold created from wood Square outlet vs. round outlet MATERIAL AND CONSTRUCTION DECISIONS

12. Arkansas Space Grant Consortium Ellis College Planning and Advisory Committee HSU Physics Student Collaborators: Ross Pilgreen Nathan Johnson Jonathan Springer Brian Terry Matthew Bolt THANKS!