Two-Dimensional Heat Plumes for Fog Dispersal.

摘要

A facility was created and operated to study in clear air, 1/3 to 1/12 full size, the nature of two-dimensional momentum driven warm plumes over a runway. Twenty-four, one-horsepower, gasoline-driven blowers were used in combination with evaporative propane burners. A 100 ft long paved 'runway', 50 ft wide, bounded on each end by curtains 30 ft high by 100 ft long perpendicular to the runway, was installed for this study of the crosswind case. The cases of sources placed upwind and/or downwind of the runway were studied. This report covers system design and operation, math modeling, and applications engineering of a portion of the results. Instrumentation, data reduction, and comprehensive reporting of results were the responsibility of AFCRL. Tests were also run in a micrometeorological tunnel at 1/50 and 1/72 scale. The scaling law involving the ratio of buoyancy to momentum, proved to work when constant Delta T was run at various scale sizes. The most efficient system appeared to be the use of one row on each side of the runway, as close to the runway as possible, with the downwind row furnishing most of the momentum and heat to the runway region. (Author)