In-Situ Ablation Experiments of Cork-based and Carbon Phenolic Thermal Protection Materials in an X-Ray Synchrotron Facility

Sakraker, Isil; Joshi, Archana; Böhrk, Hannah; Haenschke, Daniel; Cecilia, A.

doi:10.2514/6.2018-3588

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“…The 2D images show clearly that the char front propagates linearly inward in the contrast of the swelling outer sample shape. The constant recession rate assumption has also been confirmed in a secondary campaign by Sakraker et al [20], at the X-Ray synchrotron facility of Karlsruhe Institute of Technology in Germany.…”

Section: Swelling and Recession Profilesmentioning

confidence: 52%

“…Figure 9 shows the in-depth temperature profiles of some test cases. It should be noted that in-situ material testing with a coupled X-Ray imaging such as in an X-Ray Synchrotron facility [20] proves to be very useful especially for swelling materials such as cork, to determine temperature at exact 3D locations during plasma exposure. However, such experiments require dedicated portable plasma facilities that are not powerful as fixed facilities such as Plasmatron, in addition to the fact that sample sizes are very limited due to the limited field of view of X-Ray Synchrotron measurements.…”

Section: Surface and In-depth Temperaturesmentioning

confidence: 99%

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Performance of cork-based thermal protection material P50 exposed to air plasma

2021

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Cork P50 thermal protection material was characterized under the Earth atmospheric entry conditions in the framework of the in-flight experiment QARMAN. A total of 25 P50 samples were exposed to air plasma ranging the chamber static pressure values of 1500, 4100, 6180, and 20,000 Pa and heat fluxes between 280 and 3250 kW/m$$^2$$ 2 . The sample radius was also varied between 11 and 25 mm radius to investigate the effects of the stagnation line velocity gradient. The experimental results on heat flux, pressure, surface and in-depth temperatures, surface emissivity, swelling and recession rates, and computed boundary layer profiles as well as the mass blowing rates are presented. A material characterization data suite is also provided including thermogravimetric analysis, specific heat, and thermal conductivity. Overall, a wide range of experimental data of Cork P50 material in Earth atmospheric entry conditions is made available to modelers and engineers for improved material response models and heat shield design consolidation.

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Section: Swelling and Recession Profilesmentioning

confidence: 52%

Section: Surface and In-depth Temperaturesmentioning

confidence: 99%