Discussion Overview
The discussion revolves around selecting appropriate temperature and pressure sensors for a final year project (FYP) focused on observing the behavior of a valveless pulse jet. The project involves altering the shape and dimensions of the combustion chamber while maintaining a constant volume, with temperature measurements expected to reach between 2000°C and 2500°C and a compression ratio of approximately 1.2.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant expresses skepticism about the availability of sensors that can withstand the high temperatures directly, suggesting the need for unconventional solutions.
- Another participant proposes a non-contact infrared approach for temperature measurement as a potential solution.
- A specific probe that can handle temperatures up to 2300°C is mentioned, along with a caution about its sensitivity to oxidation, implying a need for periodic replacement.
- Concerns are raised about the need for sensors to extend into the combustion chamber to accurately measure gas temperature rather than wall temperature, which may have significant thermal inertia.
- Discussion includes the necessity for high-frequency response sensors due to the short pulse times of the jet, with references to specific thermocouple types that may be suitable but may not have the desired frequency response.
- For pressure measurement, it is noted that high-frequency pressure transducers will be necessary, along with methods to keep them cool, given the high temperatures involved.
Areas of Agreement / Disagreement
Participants express differing views on the feasibility of available sensors for the specified temperature range, with some suggesting alternative measurement methods while others highlight the limitations of conventional sensors. The discussion remains unresolved regarding the best approach to sensor selection.
Contextual Notes
Limitations include the potential for measurement error at high temperatures and the need for specific sensor designs to achieve accurate readings in a dynamic environment.