Wind Tunnel Design Basics- Subsonic Wind Tunnels — Lesson 2

This lesson covers the design basics of subsonic wind tunnels, focusing on the closed circuit low speed wind tunnel. It explains the function and integration of each component in the tunnel circuit, starting with the test section and moving downstream. The lesson also discusses the importance of having an enclosure around the test section, the role of the diffuser, and the use of turning vanes for smooth turning of the flow. It further explains the concept of energy ratio and section loss coefficients, and how these factors affect the energy efficiency of the tunnel. For instance, the lesson highlights that the energy ratio for closed circuit or open circuit tunnels typically range between three to seven, while for a free jet facility, it is always less than one.

Video Highlights

01:27 - Detailed explanation of the test section of the wind tunnel and its features.
06:22 - Discussion on the turning vanes in the wind tunnel and their function.
9:13 - Discussion on the fan section of the wind tunnel and its features.
15:37 - Explanation of the settling chamber in the wind tunnel and its function.
23:01 - Discussion on the energy ratio and section loss coefficient as measures of a wind tunnel's energy efficiency.

Key Takeaways

- The closed circuit low speed wind tunnel is made up of several components, each with a specific function to ensure the smooth operation of the tunnel.
- The test section, diffuser, and turning vanes are crucial components in the tunnel circuit.
- An enclosure around the test section is important for controlling the flow of air and housing necessary facilities.
- The energy ratio and section loss coefficients are key factors in determining the energy efficiency of the tunnel.
- The energy ratio for closed circuit or open circuit tunnels typically range between three to seven, while for a free jet facility, it is always less than one.