Experimental study on liquid-sloshing suppression by bulkhead structures
Liquid sloshing load is one of the key loads for the structural design of tank in Liquefied Natural Gas(LNG)carrying vehicle.When the sloshing load is too large,it will lead to local damage of the tank struc-ture,which will cause liquid leakage and even the overturning of LNG vehicle.In this paper,based on the previous numerical results,two kinds of wall structures,i.e.trapezoid and square,were proposed.Liquid sloshing in tanks with different wall structures was experimentally studied.For the free-surface evolution and the distribution characteristics of impact load,with the help of statistical analysis,the effectiveness of wall structures in suppressing liquid sloshing was qualitatively and quantitatively analyzed.The results show that the presence of wall structures has changed the flow field.And instead of direct impact by water,an indirect impact by gas-containing liguid occurs.During the sloshing and impact of air-containing liquid,a large num-ber of air-liquid mixtures and bubbles are generated,effectively reducing the impact load.Furthermore,the square wall structure is better than the trapezoidal wall structure for suppressing impact load.
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