Abstract
The spallation phenomenon was studied through numerical analysis using a coupled Lagrangian particle tracking code and a hypersonic aerothermodynamics computational fluid dynamics solver. The results show that carbon emission from spalled particles results in a significant modification of the gas composition of the post-shock layer. Results from a test campaign at the NASA Langley HYMETS facility are presented. Using an automated image processing of short exposure images, two-dimensional velocity vectors of the spalled particles were calculated. In a 30-s test at 100 W/cm2 of cold-wall heat flux, more than 722 particles were detected, with an average velocity of 110 m/s.
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Acknowledgments
Financial support for this work was provided by NASA Award NNX13AN04A, NASA Award NNX14AI97G and NASA Kentucky EPSCoR Award NNX10AV39A. Additional support was generously provided by the Hypersonic EDL program, through M.J. Wright at NASA Ames. The authors are immensely grateful to him. They also would like to thank M.J. Gasch at NASA Ames, as well as J.G. Gragg and S.B. Jones at NASA Langley for their technical assistance. Lastly, the authors are grateful to E. Sozer at NASA Ames for insightful discussions on the CFD code.
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This paper is based on a presentation at the 8th European Symposium on Aerothermodynamics for Space Vehicles, March 2–6, 2015, Lisbon, Portugal.
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Martin, A., Bailey, S.C.C., Panerai, F. et al. Numerical and experimental analysis of spallation phenomena. CEAS Space J 8, 229–236 (2016). https://doi.org/10.1007/s12567-016-0118-4
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DOI: https://doi.org/10.1007/s12567-016-0118-4