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A quick accurate model of nozzle backflowBackflow from nozzles is a major source of contamination on spacecraft. If the craft contains any exposed high voltages, the neutral density produced by the nozzles in the vicinity of the craft needs to be known in order to assess the possibility of Paschen breakdown or the probability of sheath ionization around a region of the craft that collects electrons for the plasma. A model for backflow has been developed for incorporation into the Environment-Power System Analysis Tool (EPSAT) which quickly estimates both the magnitude of the backflow and the species makeup of the flow. By combining the backflow model with the Simons (1972) model for continuum flow it is possible to quickly estimate the density of each species from a nozzle at any position in space. The model requires only a few physical parameters of the nozzle and the gas as inputs and is therefore ideal for engineering applications.
Document ID
19910036932
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kuharski, R. A.
(Maxwell Laboratories, Inc. La Jolla, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 91-0608
Accession Number
91A21555
Funding Number(s)
CONTRACT_GRANT: NAS3-25347
Distribution Limits
Public
Copyright
Other

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