A three-dimensional, unstructured-grid, pressure-based, reacting flow, computational fluid dynamics and heat transfer methodology was employed to study the base-heating environment of a lunar lander demonstrator, during terrestrial ground testing. Two base-heating environments were investigated: lunar lander demonstrator sitting on pad, and lunar lander demonstrator hovering at a distance above ground. Two unique and quite different base-flow physics are found for these two cases. In the case of the demonstrator sitting on pad, the computed heat fluxes are high and the base flow are unsteady, caused by a Coanda effect precursor, which make the fountain jet oscillate about the center of the base. For the second case, due to the higher elevation of the demonstrator and the layout of the nozzles, the Coanda effect forces the fountain jet to attach to two of the nozzle plumes, resulting in much lower computed base heat fluxes.
Base Heating Environment During Ground Testing of a Lunar Lander Demonstrator
Journal of Thermophysics and Heat Transfer ; 34 , 4 ; 826-835
2020-04-22
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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