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Center Push-Pull Ventilation for Open Surface Tanks

机译：开放式水箱的中心推拉式通风

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Center push/pull ventilation as a means of ventilating open surface tanks was evaluated. A mockup tank and center push/pull ventilation system were designed and constructed. The center push/pull ventilation system consisted of a nozzle at the centerline of the tank that directed a jet of air toward exhaust hoods on two parallel sides of the tank. Airflow and ventilation patterns were determined by visually observing smoke put into the push blower inlet, using smoke tube traces, or a hot wire anemometer. A match point curve (curve of minimum pull flow for a given push flow) was determined. A break in the curve occurred for push flows between 40 and 45 cubic feet per minute. Velocity profiles were constructed. General airflow patterns were determined. Airflow patterns indicated that the air jet turned and climbed the hood face. All of the air entering the lower two thirds of the hood slot was jet and entrained air. The rest of the air entering the slot was mostly ambient air from above the hood. The author concludes that the results can be used with tanks having similar parameters to select proper size of push/pull blowers and other system components.

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