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Parametric studies with an atmospheric diffusion model that assesses toxic fuel hazards due to the ground clouds generated by rocket launchesParametric studies were made with a multilayer atmospheric diffusion model to place quantitative limits on the uncertainty of predicting ground-level toxic rocket-fuel concentrations. Exhaust distributions in the ground cloud, cloud stabilized geometry, atmospheric coefficients, the effects of exhaust plume afterburning of carbon monoxide CO, assumed surface mixing-layer division in the model, and model sensitivity to different meteorological regimes were studied. Large-scale differences in ground-level predictions are quantitatively described. Cloud alongwind growth for several meteorological conditions is shown to be in error because of incorrect application of previous diffusion theory. In addition, rocket-plume calculations indicate that almost all of the rocket-motor carbon monoxide is afterburned to carbon dioxide CO2, thus reducing toxic hazards due to CO. The afterburning is also shown to have a significant effect on cloud stabilization height and on ground-level concentrations of exhaust products.
Document ID
19750014904
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Stewart, R. B. (NASA Langley Research Center Hampton, VA, United States)
Grose, W. L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
May 1, 1975
Subject Category
Geophysics
Report/Patent Number
L-9694
NASA-TN-D-7852
Accession Number
75N22976
Funding Number(s)
PROJECT: RTOP 180-72-50-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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