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Parametric Study of Peripheral Nozzle Configurations for Supersonic Retropropulsion
 

Summary: Parametric Study of Peripheral Nozzle Configurations
for Supersonic Retropropulsion
Nošel M. Bakhtian
Stanford University, Stanford, CA, 94305
Michael J. Aftosmis
NASA Ames Research Center, Moffett Field, CA, 94035
With sample-return and manned missions on the horizon for Mars exploration, the abil-
ity 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 retro-
propulsion 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 2 to 8 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

  

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

 

Collections: Engineering