Anti-sloshing performance of baffles in independent C-type liquefied natural gas tanks

Abstract

Three types of baffles, i.e., X-type, Y-type, and Slat-type, based on existing ring-type baffles, were used to analyze the influence of structure, arrangement, and permeability ratio of sloshing suppression baffles and liquid levels on the anti-sloshing performance of independent C-type liquefied natural gas (LNG) tanks. The accuracy of the numerical model was verified <i>via</i> sloshing simulations of a two-dimensional rectangular tank and a three-dimensional independent C-type LNG tank. Based on numerical predictions of the anti-sloshing performance of different baffles at three liquid levels, a sensitivity analysis of the permeability ratios of four representative baffles was performed. The analysis indicated that the installation of sloshing suppression baffles significantly reduced the impact load and pitch moment on C-type tanks. When liquid levels were increased, the anti-sloshing efficiency first increased and then decreased, and the wave amplitude suppression coefficient gradually decreased. The influence of liquid levels and permeability ratios on anti-sloshing efficiencies and wave amplitude suppression coefficients were more obvious compared with baffle structure. The order of anti-sloshing performance of four representative baffles from high to low was determined to be SlatB1, YB1, XB1, and RB.