Design, integration and preliminary results of the IXV Catalysis experiment

Viladegut, Alan; Panerai, Francesco; Chazot, Olivier; Pichon, Thierry; Bertrand, Pierre; Verdy, C.; Coddet, Christian

doi:10.1007/s12567-016-0136-2

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…Table 5.12. : Thermocouple locations from the leading edge and their time-averaged temperature measurements along the linear calorimeter for extrapolation methodology validation at offstagnation point with thermo-mechanical simulations and microscopic assessment of the patch coating quality [116], provided enough confidence on the reliability of the C/SiC-Mullite interface for the objective of CATE and its suitability for the IXV flight [11].…”

Section: Test Campaign and Resultsmentioning

confidence: 99%

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Farran¹

2018

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My wish is that the reader enjoys this dissertation and that it brings him/her a better understanding on Gas-Surface Interaction (GSI) phenomena. Nonetheless, this journey through the VKI doctoral program has been long, and I wouldn't be able to address this topic without acknowledging people that were by my side during this research, because without them this thesis would not have been possible: A big thank to Olivier Chazot for giving me the opportunity to develop my thesis in the Plasmatron facility. His office was always open and ready for discussion. A special mention to his telephone, most of the time ringing during each one of our conversations. Also to Roberto Flores, director of this thesis in UPC, who allowed me to keep in contact with my university. Following the experimental nature of this dissertation, I would like to mention also the contribution made by Pascal Collin. He did an excelent job running the Plasmatron and installing the probes. I will always remember his desperation when water leaks appear when making the vacuum in the chamber. I thank also the rest of the Plasmatron team: Bernd Helber and Damien Le Quang as radiation experts, and Işil Şakraker as advisor for calorimetric measurements. Many CFD simulations appear in this dissertaion. For that, the advice of Vincent Van Der Haegen, my office mate, has been extremely useful to achieve a converged solution. Also, the flight extrapolation technique developed here deserves my gratitude to Fabio Pinna, whose expertise in CFD helped me to improve my IXV simulations and achieve the "Pinna Certification". I really enjoyed working with them. Other VKI colleagues I want to mention are Alessandro Turchi, who helped me understand many aspects of GSI phenomena, Francesco Panerai who set the basis to develop this dissertation, and Georgios Bellas-Chatzigeordis to whom I encourage to continue with the catalytic model development and implementation in VKI numerical tools. Last but not least, special thanks to my family. They encouraged me to pursue a doctorate degree and supported me in the most difficult moments.

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Section: Test Campaign and Resultsmentioning

confidence: 99%

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Farran¹

2018

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“…Notably, Hellstein and Szwedo [19] combined a 3D scanner with IR thermography for realtime reconstruction of 3D temperature maps in non-destructive testing of composite structures. However, application of such techniques to PWT experiments is scarce in the literature: radiometers are typically used to measure temperature around the stagnation point [20,21] while IR thermography, lacking a spatial calibration, usually provides only some qualitative information from the 2D image [22][23][24][25][26]. Hence, 3D temperature maps reconstruction is highly desirable to provide accurate and spatially calibrated measurements.…”

Section: Introductionmentioning

confidence: 99%

3D infrared temperature maps measurements of ablative materials during plasma wind tunnel experiments

Fagnani¹,

Helber²,

Hubin³

et al. 2023

Meas. Sci. Technol.

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Accurate surface temperature and recession measurements are crucial experimental data for plasma wind tunnel testing of ablative thermal protection materials. In this work we propose a novel methodology to reconstruct infrared temperature maps on 3D geometries undergoing surface recession. An optical calibration technique is used to extract 3D metric information from the 2D thermal images, thanks to a specific calibration target with control points. The evolution of the sample shape during the experiment is tracked from a side view, using a visual-range camera with dedicated image processing, and reconstructed in 3D under the assumption of axisymmetry. The surface temperature is projected on the time-varying 3D geometry from the calibrated thermograms. The technique is demonstrated on a graphite ablation experiment in air plasma. The reconstructed maps provide detailed multidimensional information about the transient temperature evolution, overcoming traditional approaches that are limited around the stagnation point. The technique allows to study ablation mechanisms with further detail, improving experimental data for material qualification and validation of simulation codes.

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“…Nonetheless, the model has some drawbacks. Even though the γ parameter should depend only on the material properties (e.g., roughness) and its surface temperature [21], it has been observed experimentally that it depends explicitly on pressure [22] and the degree of chemical nonequilibrium in the boundary [23,24].…”

Section: Introductionmentioning

confidence: 99%

Energy Accommodation Coefficient Calculation Methodology Using State-to-State Catalysis Applied to Hypersonic Flows

2020

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The interplay of a gas-surface interaction and thermal nonequilibrium is still an open problem in aerothermodynamics. In the case of reusable thermal protection systems, it is unclear how much of the recombination energy is stored internally in the molecules produced by surface catalytic reactions, potentially leading to nonequilibrium between their translational and internal energy modes. A methodology is developed to calculate the energy accommodation coefficient using a rovibrational state-to-state chemical mechanism for a nitrogen mixture coupled with a generalized form of the catalytic recombination coefficient. The flow around a spherical body is simulated in hypersonic conditions, allowing study of the amount of energy deposited on the surface and stored in the recombining molecules. Internal energy quenching into translational energy is found, which is a phenomenon also observed experimentally, keeping the total energy transferred to the surface overall constant. The methodology developed for the application of a state-to-state model in the computational fluid dynamics framework coupled with catalysis is generic and applicable to a variety of other similar mechanisms.

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Design, integration and preliminary results of the IXV Catalysis experiment

Cited by 11 publications

References 13 publications

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

Assessment of gas-surface interaction modelling for lifting body re-entry flight design

3D infrared temperature maps measurements of ablative materials during plasma wind tunnel experiments

Energy Accommodation Coefficient Calculation Methodology Using State-to-State Catalysis Applied to Hypersonic Flows

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