- Author
-
Beyler, C. L.
- Title
- Interaction of Fire and Sprinklers.
- Coporate
- Maryland Univ., College Park
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
Department of Health, Education and Welfare, Washington, DC
- Report
-
NBS GCR 78-121,
September 1977,
78 p.
- Distribution
- Available from National Technical Information Service
- Contract
- GRANT-69008
- Keywords
-
drop sizes
|
fire models
|
fire plumes
|
sensitivity analysis
|
sprays
|
sprinkler heads
|
vaporizing
- Abstract
- Models of the actuation of sprinklers, drop dynamics in a nonfire situation, and drop dynamics in a fire situation are developed. Sensitivity analysis is performed with the models. The actuation model makes use of empirical curve fit relations for the temperature and velocity fields of the ceiling-jet. The relations are the result of curve fits to the exact solutions given by Alpert's model. The model also makes use of "Plunge Test" data as developed by Heskestad and Smith. The model of nonfire drop dynamics developed is found to be unable to predict the distribution pattern from sprinklers. The model utilizes a single constant initial velocity for all drops. Results indicate that a distribution of initial velocities exists. The model of drop dynamics in a fire indicates that evaporation need not be considered when studying drop penetration through the fire plume. The fire plume is found to effect similarly all drops which exceed a critical diameter. Below the critical diameter the drop is carried away by the plume. The critical diameter is a function of the heat output.