This paper will describe the design and control techniques of the open-circuit subsonic wind tunnel with closed testing section (WT) for study purpose. The goal is to design a WT that can be tested at a wind speed of 30 m/s, where the desired cross-sectional area of the test chamber is 0.5x0.5 m. The pressure drop inside the WT has been calculated in order to select one of the available axial fans from the manufacturer’s catalog, and computational fluid dynamics (CFD) was performed to check the result. In order to obtain a smooth airflow in the test section, a proportional integral (PI) controller has been used to eliminate fluctuations in air speed.
 Jewel B Barlow, William H Rae, and Alan Pope. Low speed wind tunnel testing. John Wiley & Sons, 1999.
 James H Bell and Rabindra D Mehta. Contraction design for small low-speed wind tunnels. 1988.
 Ravi Datt Mehta and Peter Bradshaw. Design rules for small low speed wind tunnels. Aeronautical Journal, 83(827):443–449, 1979.
Yakhshilikov, Jamshid and Inoyatkhodjaev, Jamshid
"Design And Control Techniques Of The Open-Circuit Subsonic Wind Tunnel With Closed Testing Section,"
Acta of Turin Polytechnic University in Tashkent: Vol. 10
, Article 8.
Available at: https://uzjournals.edu.uz/actattpu/vol10/iss4/8