May 6, 2022
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March 14, 2022
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March 2, 2022
From left to right: Raghava Davuluri, Page Askins, Bibin Joseph, Simon Schmidt, Jino George, Alex Zibitsker, Rick Fu, Ares Barrio, Berk Gur, Sujit Sinha, Kirsten Ford, Kristen Price, John Schmidt, Matt Ruffner, Alexandre Martin
Missing from the picture: Craig Meade, Luke Fortner, Sean McDaniel, Justin Cooper, Kate Rhoads, Tori DuPlessis, Kate MacLarney, Mohammad Khaleel
January 11, 2022
Highlights
• Particle tracking velocimetry conducted on particles shedding from ablative thermal protection system materials.
• Tests indicate spallation unaffected by pyrolysis gas formation, but impact of environment largely felt through effects due to gas composition.
• Effect of sample geometry suggested that surface shear stress plays a role in spallation particle shedding into the flow.
• An approach was devised to estimate particle diameter based on the acceleration of the particles once they left the material sample.
• Particle diameters were in the range expected for formation from both individual fibers as well as larger groups of fibers.
Price, K. J., Borchetta, C. G., Hardy, J. M., Panerai, F., Bailey, S. C. C., and Martin, A., “Arc-Jet Measurements of Low-Density Ablator Spallation,” Experimental Thermal and Fluid Science, Vol. 133, No. 110544, May 2022.
doi: 10.1016/j.expthermflusci.2021.11054
January 11, 2022
[1] Banerjee, A., Martin, A., and Poovathingal, S., “Estimating Effective Radiative Properties and In-Depth Radiative Heating of Porous Ablators,” AIAA SciTech Forum, AIAA Paper 2022-1640, Jan 2022. DOI:10.2514/6.2022-1640
[2] Cooper, J. M., Salazar, G., and Martin, A., “Numerical Investigation of Film Coefficient Engineering Methodology for Dissociated, Chemically Reacting Boundary Layers,” AIAA SciTech Forum, AIAA Paper 2022-1907, Jan 2022. DOI:10.2514/6.2022-1907
[3] Davuluri, R. S. C., Fu, R., Tagavi, K. A., and Martin, A., “Numerical investigation on the effect of spectral radiative heat transfer within an ablative material,” AIAA SciTech Forum, AIAA Paper 6.2022-1283, Jan 2022. DOI:10.2514/6.2022-1283
[4] Fortner, L., Maddox, J., and Martin, A., “Numerical investigation of an oxyacetylene torch with regards to an ablative material used in re-entry,” AIAA SciTech Forum, AIAA Paper 2022-1498, Jan 2022. DOI:10.2514/6.2022-1498
[5] Fu, R., Schmitt, S., and Martin, A., “Thermo-Chemical-Structural Modeling of Carbon Fiber Pitting and Failure Mechanism,” AIAA SciTech Forum, AIAA Paper 2022-1282, Jan 2022. DOI:10.2514/6.2022-1282
[6] Schmidt, J. D., Nichols, J. T., Ruffner, M., Nolin, R., Smith, W. T., and Martin, A., “Kentucky Re- Entry Universal Payload System (KRUPS): Design and Testing for Hypersonic Re-Entry Flight,” AIAA SciTech Forum, AIAA Paper 2022-1576, Jan 2022. DOI:10.2514/6.2022-1576
[7] Schmitt, S., Fu, R., and Martin, A., “Extension of Kinetic Monte Carlo Simulation Framework to Multilayer Graphene and Graphite Oxidation,” AIAA SciTech Forum, AIAA Paper 2022-1284, Jan 2022. DOI:10.2514/6.2022-1284
[8] Schmitt, S. and Martin, A., “Kinetic Monte Carlo Simulations of Nitrogen-Carbon Gas-Surface Reaction at High Temperatures,” AIAA SciTech Forum, AIAA Paper 10.2514/6.2022-0113, Jan 2022. DOI:10.2514/6.2022-0113
[9] Seif, M., Puppo, J., Zlatinov, M., Schaffarzick, D., Martin, A., and Beck, M., “Stochastic mechanical modeling of Duocel foam from micro- to macro- length scales,” AIAA SciTech Forum, AIAA Paper 2022-0627, Jan 2022. DOI:10.2514/6.2022-0627
[10] Zibitsker, A., McQuaid, J., Brehm, C., and Martin, A., “Development and Verification of a Mesh Deformation Scheme for a Three Dimensional Ablative Material Solver,” AIAA SciTech Forum, AIAA Paper 2022-1285, Jan 2022. DOI:10.2514/6.2022-1285
[11] Zibitsker, A., McQuaid, J., Martin, A., and Brehm, C., “Fully-Coupled Simulation of Low Temperature Ablator and Hypersonic Flow Solver.” AIAA SciTech Forum, AIAA Paper 2022-0676, Jan 2022. DOI:10.2514/6.2022-0676
September 21, 2021
The P1 approximation to the radiative transfer equation is coupled to a material response code in order to model ablative materials. These types of materials are used as thermal protection systems for atmospheric entry vehicles. Several test cases are presented to verify the implementation and to validate the approach. Representative conditions -- mimicking an arc-jet, a radiant heating facility, and an atmospheric entry trajectory -- are used to demonstrate the validity of the coupled model. The code is then used to replicate an experiment that studies the effects of the wavelength on the thermal response of charring ablators. Two lasers are used to deliver the heat pulse. The first laser, at a wavelength of 1.07 micron, deposits the energy within the material, as opposed to the 10.6 micron laser, which mostly does it on the surface. The numerical results verify the findings of the experiment, thus confirming the importance of spectrally resolving the radiative heat flux within charring ablators.
Martin, A. and Panesi, M., “Radiative transmission and absorption within the thermal protection system of an atmospheric entry spacecraft,” Journal of Spacecraft and Rockets, 2020.
doi:10.2514/1.A35029
April 30, 2021
Davuluri, R. S. C., Bailey, S. C. C., Tagavi, K. A., and Martin, A., “A drag coefficient model for lagrangian particle dynamics relevant to high-speed flows,” International Journal of Heat and Fluid Flow, vol. 87, 2021, Article 108706.
doi: 10.1016/j.ijheatfluidflow.2020.108706.
Omidy, A. D., Cooper, J. M., Tagavi, K. A., and Martin, A., “VISTA, an open Avcoat material database for material response modeling,” JANNAF Journal of Propulsion and Energetics, vol. 12, no. 1, 2021.
Ho, M., Leclaire, S., Trépanier, J.-Y., Reggio, M., and Martin, A., “Permeability cal- culation of a fibrous thermal insulator using the lattice boltzmann method,” Journal of Thermophysics and Heat Transfer, 2021.
doi: 10.2514/1.T6154.
Cochell, T. J., Unocic, R. R., Grana-Otero, J., and Martin, A., “Nanoscale oxidation behavior of carbon fibers revealed with in situ gas cell stem,” Scripta Materialia, vol. 199, 2020, Article 113820.
doi: 10.1016/j.scriptamat.2021.113820.
Duzel, U., Schroeder, O. M., Zhang, H., and Martin, A., “Numerical simulation of an arc jet test section,” Journal of Thermophysics and Heat Transfer, vol. 34, no. 2, pp. 393–403, 2020.
doi: 10.2514/1.T5722.
Fu, R., Weng, H., Wenk, J. F., and Martin, A., “Thermal expansion for charring ablative materials,” Journal of Thermophysics and Heat Transfer, vol. 34, no. 1, pp. 57– 65, 2020.
doi: 10.2514/1.T5718.
Weng, H., Duzel, U., Fu, R., and Martin, A., “Geometric effects on charring ablator: modeling of the full-scale stardust heat shield,” Journal of Spacecraft and Rockets, vol. 58, no. 2, pp. 302–315, 2020.
doi: 10.2514/1.A34828.
Panerai, F., Cochell, T. J., Martin, A., and White, J. D., “Experimental measurements of the high-temperature oxidation of carbon fibers,” International Journal of Heat and Mass Transfer, vol. 136, pp. 972–986, 2019.
doi: 10.1016/j.ijheatmasstransfer.2019.03.018.
Rostkowski, P., Venturi, S., Omidy, A. D., Weng, H., Martin, A., and Panesi, M., “Calibration and uncertainty quantification of vista ablator material database using bayesian inference,” Journal of Thermophysics and Heat Transfer, vol. 33, no. 2, pp. 356– 369, 2019.
doi: 10.2514/1.T5396.
Zhang, H., Martin, A., and Wang, G., “Numerical analysis of time accuracy of a primitive variable-based formulation of the conservative form of the governing equations for compressible flows,” International Journal of Computational Fluid Dynamics, vol. 33, no. 1-2, pp. 1–9, 2019.
doi: 10.1080/10618562.2018.1549730.
Bailey, S. C. C., Bauer, D., Panerai, F., Splinter, S. C., Danehy, P. M., Hardy, J. M., and Martin, A., “Experimental analysis of spallation particle trajectories in an arc-jet environment,” Experimental Thermal and Fluid Science, vol. 93, pp. 319–325, 2018.
doi: 10.1016/j.expthermflusci.2018.01.005
April 30, 2021
Kristen Price, a PhD student in GSIL, Selected as a NASA Space Technology Graduate Researcher:
https://www.engr.uky.edu/news/2021/04/kristen-price-selected-nasa-space-...
