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Parametric Study of Peripheral Nozzle Configurations for Supersonic Retropropulsion

Summary: Parametric Study of Peripheral Nozzle Configurations
for Supersonic Retropropulsion
NoŽl M. Bakhtian
Stanford University, Stanford, California 94305
Michael J. Aftosmis
NASA Ames Research Center, Moffett Field, California 94035
DOI: 10.2514/1.48887
With sample-return and manned missions on the horizon for Mars exploration, the ability to decelerate high-mass
systems to the planet's surface has become a research priority. This paper explores the use of supersonic
retropropulsion, the application of jets facing into the freestream, as a means of achieving drag augmentation.
Numerical studies of retropropulsion flows were conducted using a Cartesian Euler solver with adjoint-driven mesh
refinement. After first validating this simulation tool with existing experimental data, a series of three broad
parametric studies comprising 181 total runs was conducted using tri- and quad-nozzle capsule configurations.
These studies chronicle the effects of nozzle location, orientation, and jet strength over Mach numbers from two to
eight and angles of attack ranging from 5 to 10
. Although many simulations in these studies actually produced
negative drag augmentation, some simulations displayed local overpressures 60% higher than that possible behind a
normal shock and produced drag augmentation on the order of 20%. Examination of these cases leads to the
development of an aerodynamic model for significant drag augmentation in which the retrojets are viewed as oblique


Source: Alonso, Juan J. - Department of Aeronautics and Astronautics, Stanford University


Collections: Engineering