Daniel Gabor KOVACS, Guillaume GROSSIR, Sebastien PARIS

DOI Number: N/A

Conference number: HiSST-2025-025

This work focuses on developing in-house manufacturing and calibration techniques for coaxial thermocouples, aiming to measure transient surface temperatures and infer wall heat fluxes within short-duration hypersonic facilities. A furnace-based oxidation technique is tested to electrically insulate and mount a Chromel tube and a Constantan bar together, creating an E-type coaxial thermocouple. Successful bonding and electrical insulation between the two materials are demonstrated, and the active junction of the thermocouple is effectively obtained by scratching the oxidized surfaces. Design and manufacturing recommendations are issued and are expected to reduce the insulation layer thickness between the materials and to shorten the response time of the sensor. A liquid droplet dripping-based calibration methodology is established to measure the thermal product of such thermocouples. A parametric study addresses the influence of droplet size, dripping height, and droplet viscosity on the response of the thermocouple and on the corresponding thermal product.

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In Categories: 1.Events, 1.HiSST 2025, Testing & Evaluation
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