Chapter
Apr 26, 2012
Mars Landing Engine Plume Impingement Ground Interaction
Authors: Manish Mehta [email protected], Anita Sengupta [email protected], Mark Pokora, Leslie Hall, and Nilton RennoAuthor Affiliations
Publication: Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments
Abstract
A subscale landing site alteration program was conducted in support of future Mars landed Missions to provide site alteration data including soil erosion mechanisms and dependency on throttle level, altitude, and ground slope. A 25% scale Viking Lander Engine was fired into a representative Mars stimulant soil-media test bed. The test facility was operated at ∼633 Pa to match the supersonic plume expansion at mars ambient pressure. The test apparatus utilized quarter symmetry with the use of baffle planes. A media that is 1/3 the density of Mars silica was used to match the 1/3 gravity Mars ballistic coefficient and particle trajectories. Key findings include soil bulk shear failure as the primary erosion mechanism, nonlinear dependence of erosion with throttle level and ground slope, and particle size. Another key finding is that we observed significantly larger erosion rates for supersonic jets (under-expanded) at Mars atmospheric pressure as opposed to jets (highly over-expanded) at Earth atmospheric environment. The highest ground pressures were also observed in the Mars atmospheric regime with jet expansion ratios greater than 2.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, 48104. E-mail: [email protected]
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., MS 301-490, Pasadena, CA, 91109. E-mail: [email protected]
Mark Pokora
Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, 48104
Leslie Hall
Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, 48104
Nilton Renno
Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, 48104
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