Direct and Simultaneous Measurement of Wall-Heat Flux and Temperature in a Shock Tube by Atomic Layer Thermopiles
Title of conference publication:
AIAA SCITECH 2025 Forum
Organizer (entity):
American Institute of Aeronautics and Astronautics, Inc.
Conference title:
AIAA SciTech Forum (2025, Orlando, Fla.)
Venue:
Orlando, FL
Year of conference:
2025
Date of conference beginning:
06.01.2025
Date of conference ending:
10.01.2025
Year:
2025
Language:
Englisch
Abstract:
This study focuses on the static and dynamic analysis and calibration experiments of Atomic Layer Thermopile (ALTP) sensors exposed to a traveling shock wave at the side and end wall of a shock tube. A newly developed methodology allows direct and simultaneous measurement of heat-flux density and temperature in ALTPs. The heat flux at the end wall of the shock tube is directly measured by an ALTP-sensor and is compared with analytical end-wall solutions. The analytical heat-flux progression is derived from estimations for post-reflected shock conditions based on the pressure data and 1-D computations. The experimental data compare well with the time-invariant analytically-determined heat-flux progression for lowand high-pressure conditions. In addition, the dynamic response of heat flux as well as of temperature is investigated: ALTP-sensor response on the side wall compares well with optical dynamic calibration results. The response of the end-wall sensor significantly underestimates the optically predicted response times. For the first time, the dynamic response of ALTP temperature data could be investigated in short-duration shock tube experiments and compared with coaxial thermocouple readings. «
This study focuses on the static and dynamic analysis and calibration experiments of Atomic Layer Thermopile (ALTP) sensors exposed to a traveling shock wave at the side and end wall of a shock tube. A newly developed methodology allows direct and simultaneous measurement of heat-flux density and temperature in ALTPs. The heat flux at the end wall of the shock tube is directly measured by an ALTP-sensor and is compared with analytical end-wall solutions. The analytical heat-flux progression is d... »