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This paper introduces a 'superdrop' concept for the characterisation of a sprinkler spray, where the statistical characteristics of each 'superdrop' have been determined from the experimental data of a Wormald 'A' culp sprinkler in the pendant position. The computational fluid dynamics (CFD) model JASMINE has been adapted to incorporate a particle tracking formulation based on the Particle-Source-In-Cell method and a sprinkler sub-model based on the 'superdrop' concept. The enhanced JASMINE sprinkler model has been verified against a h l l scale experiment examining the influence of the water spray on hot combustion products due to a fire in an enclosure. The predicted gas temperatures and the velocities are shown to be in qualitative agreement with the measurements. Further improvements in the model predictions can be obtained by improving the heat loss treatment to the boundaries and suitable optimisation of the 'superdrops'.

Superdrop Modelling Of A Sprinkler Spray In A Two-phase Cfdparticle Tracking Model