- Author
-
Alpert, R. L.
- Title
- Calculated Spray Water-Droplet Flows in a Fire Environment. Technical Report.
- Coporate
- Factory Mutual Research, Norwood, MA
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Report
-
FMRC J.I. 0J0J1.BU; RC86-BT-6,
October 1986,
56 p.
- Contract
- NBS-GRANT-NB83NADA4014
- Keywords
-
droplets
|
water flow
|
computation
|
fire suppression
|
air entrainment
|
fire plumes
|
sprays
|
heat release rate
|
sprinklers
|
large scale fire tests
- Identifiers
- suppression
- Abstract
- Numerical calculations employing a 38x38 finite difference grid have been used to model the interaction of a downward facing droplet spray with a fire plume centered on the spray axis. The fire source is simulated in these calculations by a distributed volumetric heat release in a cylindrical region, which yields without a spray, realistic peak gas temperatures and velocities and a ceiling jet temperature distribution in general agreement with recent measurements. A water spray is modeled in this axisymmetric configuraion either as a point-source of initial droplet trajectories or as a ring source of droplets near the ceiling and centered on the fire axis to simulate a single fire suppression sprinkler or a ring of sprinklers, respectively. The calculated water flux distribution for a spray alone, in the absence of a fire, compares well with a measured distribution.