Inductively Coupled Facility Qualification for Electron Transpiration Cooling Investigations

Morin, Andrew; Osborn, Rebecca C.; Schindler, Jeff C.; Jagun, Precious; Fletcher, Douglas G.; Meyers, Jason M.

doi:10.2514/6.2020-0921

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Surface temperatures of the emitter and collector were measured as a single, maximum value for each surface using an IR camera and optical pyrometer [19]. These measurements along with corresponding values from the simulations are shown as horizontal bars over the emitter and collector sections of the wall.…”

Section: Etc Resultsmentioning

confidence: 99%

“…Figure 7 compares the temperature fields for cases 3 and 4, where T in = 7000 K but density and velocity settings differ. Plasma temperatures were experimentally determined by measuring argon line emission along radial profiles at various axial locations [19]. These measurements are compared to the computed profiles in Figures 8 and 9.…”

Section: Torch Conditionsmentioning

confidence: 99%

“…Overall, the simulations were able to encompass the experimental results but uncertainties in the measurements made it difficult to draw any direct conclusions on which modeling options were most accurate. Motivated by the need for better test data to verify and validate these and other such models, researchers at the University of Vermont (UVM) have been conducting high enthalpy experiments with their 30 kW Inductively Coupled Plasma (ICP) Facility (Figure 2) [19].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Computational Models for Electron Transpiration Cooling

et al. 2021

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Recent developments in the world of hypersonic flight have brought increased attention to the thermal response of materials exposed to high-enthalpy gases. One promising concept is electron transpiration cooling (ETC) that provides the prospect of a passive heat removal mechanism, rivaling and possibly outperforming that of radiative cooling. In this work, non-equilibrium CFD simulations are performed to evaluate the possible roles of this cooling mode under high-enthalpy conditions obtainable in plasma torch ground-test facilities capable of long flow times. The work focuses on the test case of argon gas being heated to achieve enthalpies equivalent to post-shock conditions experienced by a vehicle flying through the atmosphere at hypersonic speed. Simulations are performed at a range of conditions and are used to calibrate direct comparisons between torch operating conditions and resulting flow properties. These comparisons highlight important modeling considerations for simulating long-duration, hot chamber tests. Simulation results correspond well with the experimental measurements of gas temperature, material surface temperature as well as measured current generated in the test article. Theoretical methods taking into consideration space charge limitations are presented and applied to provide design suggestions to boost the ETC effect in future experiments.

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Section: Etc Resultsmentioning

confidence: 99%

Section: Torch Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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