| タイトル | Validation of PICA Ablation and Thermal-Response Model at Low Heat Flux |
| 著者（英） | Milos, Frank S.; Chen, Yih-Kanq |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 2009-06-22 |
| 言語 | eng |
| 内容記述 | Phenolic Impregnated Carbon Ablator (PICA) was the forebody heatshield material on the Stardust sample-return capsule and is also a primary candidate material for the Mars Science Lander (MSL), the Orion Crew Module, and the SpaceX Dragon vehicle. As part of the heatshield qualification for Orion, physical and thermal properties of virgin and charred PICA were measured, and an ablation and thermal response model was developed. We validated the model by comparing it with recession and temperature data from stagnation arcjet tests conducted over a wide range of stagnation heat flux of 107 to 1102 W/sq cm. The effect of orthotropic thermal conductivity was evident in the thermal response of the arcjet models. In general, model predictions compared well with the data; however, the uncertainty of the recession prediction was greatest for heat fluxes below 200 W/sq cm. More recent MSL testing focused on the low heat flux regime of 45 to 250 W/sq cm. The new results confirm the recession uncertainty, especially for pressures below 6 kPa. In this work we focus on improving the model predictions for MSL and Orion tests below 250 W/sq cm. |
| NASA分類 | Nonmetallic Materials |
| レポートNO | ARC-E-DAA-TN293
TSM-0001 |
| 権利 | No Copyright |
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