Measuring Temperature in High-Speed Flows — Lesson 6

This lesson covers the complexities and techniques involved in measuring temperature in high-speed flows. It delves into the challenges posed by the disturbance of the flow field when a probe is inserted, leading to a rise in temperature due to sudden deceleration. The lesson introduces the concept of aero thermodynamic heating, which occurs when the kinetic energy of the fluid is converted into heat. It also explains the use of recovery factor in temperature measurement and introduces the Winkler probe, a special tool used for measuring temperature in high-speed flows. The lesson provides a detailed explanation of the Winkler probe's operation, including its design and the process of temperature measurement.

Video Highlights

01:13 - Challenges in measuring temperature in high speed flow
05:12 - Phenomenon of aero thermodynamic heating
14:31 - Concept of recovery temperature
20:56 - Winkler probe
22:41 - Working of the Winkler probe

Key Takeaways

- Measuring temperature in high-speed flows is complex due to the disturbance caused by the insertion of a probe, leading to a rise in temperature.
- The process of kinetic energy being converted into heat during the deceleration of fluid is known as aero thermodynamic heating.
- The recovery factor is used in temperature measurement to account for the non-isentropic processes involved.
- The Winkler probe is a special tool used for measuring temperature in high-speed flows.