Experimental Study on Sloshing Characteristics of a Flowing Liquid in a Tank

概要

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A small rectangular tank, 600 mm long, 100 mm wide and 800 mm high, was equipped with two vertical pipes (65 mm in outer diameter) at both sides of the tank and filled with water up to 600 mm high. The water in the tank was circulated to produce a flow in water by suction and ejection through holes in the two pipes. The tank was sinusoidally excited to generate sloshing oscillation in the flowing water. The frequency response characteristics of the sloshing amplitude were experimentally obtained for five flow-circulation patterns, and the natural frequencies and modal dampings of the first, second and third sloshing modes were estimated using a conventional modal analysis technique. The results showed that sloshing natural frequency decreased with flow velocity at the water surface and damping increased with it, and the sloshing oscillation disappeared at the critical speed of surface water flow. Approximate analysis of sloshing natural frequency based on potential flow theory gave us the formula f=√<gk tanh kh - U^2k^2>/2π,k = mπ/1 where 1 = tank width and h = water depth, which off ered a good agreement of the analytical and experimental natural frequencies of sloshing. The mechanism of sloshing wave disappearance at the critical value of surface-flow velocity was discussed.
一般社団法人日本機械学会の論文
1990-09-15