Aerodynamic Characterization of a Closed-Loop, Semi-Open Jet Wind Tunnel using Experimental and Computational Methods

Abstract

Aerodynamic characterization literature generally resolves streamwise pressure gradients, velocity distributions, non-uniformity, and turbulence intensity; yet, evaluation of turbulence in the frequency domain and comparison of experimental measurements with transient computational results are less common. Thus, an in-depth aerodynamic characterization of a closed-loop, semi-open jet wind tunnel was completed using experimental and computational methods. The work aims to improve the characterization process by evaluating turbulence scales and comparing experimental and transient computational results. Velocity profiles were experimentally measured and compared with computational results. The facilities' dormant heat exchanger was also evaluated using simplified models. Agreement was observed between experimental and computational velocity profiles and turbulence intensity distributions. A 400 mm long, 140 mm high, and 300 mm wide testing envelope was revealed with competitive non-uniformities and turbulence intensities less than 1%. Boundary layer growth occurred at an approximate rate of 3 mm every 200 mm streamwise for all velocities along with a near-zero pressure gradient. Agreement was also observed between heat exchanger models, indicating adequate cooling capabilities. Results conclude that the test section's flow field is comparable to existing facilities.iii Acknowledgements I would like to express my gratitude for the supervision and guidance that I have received from my supervisor Dr. Joana Rocha. In times of frustration, you always encouraged me to persevere and had faith in my abilities. Thank you for your dedication. I thank all of the Mechanical and Aerospace Department staff for their technical and administrative aid. A special thank you to James Cann, Alex Proctor, and Aric Adcock for providing technical assistance, manufacturing, and an overall welcoming atmosphere. I would also like to thank Neil McFadyen for his support with the Clusters, remote access capabilities, and general information technology needs. I am grateful to have been given the opportunity to work with members of the