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Velocity and Drop Size Distriutions Downstream Generic Clutter Elements Found Within Engine Nacelles



P J. Disimile, J R. Tucker, Joe Stern, Luke Mehl, B Croswell


The current work is presented as part of an effort to help develop a spray transport model that would be used within the computational fire code currently under development by Sandia National Laboratory. As part of a halon replacement research program, new high-boiling-point chemical suppressants have been identified. These agents would discharge in a liquid state, breaking into liquid droplets, and be entrained within the flow passing through the nacelle, impinging on various objects prior to reaching the fire zone. The goal of this research effort is to enhance the fundamental knowledge of spray interactions with clutter (e.g., obstacles representing fuel and hydraulic lines, electrical wire bundles, etc). Three-dimensional velocity and diameter data was collected at two locations downstream for nine combinations of clutter spacing and coflow airspeed. Analysis of velocity and diameter data consisted of polynomial regression and trigonometric analysis, which enabled the construction of mathematical correlations for the data.
Special Publication (NIST SP) - 984-4
Report Number


Disimile, P. , Tucker, J. , Stern, J. , Mehl, L. and Croswell, B. (2004), Velocity and Drop Size Distriutions Downstream Generic Clutter Elements Found Within Engine Nacelles, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed May 20, 2024)


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Created January 1, 2004, Updated February 19, 2017