Experiments and analysis of dynamic characteristics of liquid sloshing in horizontal Cassini tank

Abstract

In this study, the sloshing behaviors and dynamic characteristics of liquid sloshing in a horizontal Cassini tank were studied. The forces and torques generated by the liquid sloshing in non-equilibrium states were experimentally measured with force transducers which have been mounted on the experiment platform. The experiments mainly focus on the sloshing forces and torques generated by liquid sloshing in the tank. And the effects of the magnitude and frequency of the external excitations and the liquid-filling ratios on the sloshing characteristics were also studied. The experiments results show that the liquid sloshing in the Cassini tank is highly correlated with the excitation frequency where small variation in the frequency leads to complex changes in the liquid sloshing characteristics. In the cases with low liquid-filling ratio, in resonance state, the rotational sloshing is easier to be excited, however, in the stable-state the amplitudes of longitudinal sloshing force and torque are more significant than those of other sloshing conditions. The transversal sloshing force and torque are very small in both, rotational and translational nonlinear sloshing of small amplitude. In small-amplitude rotational and translational nonlinear sloshing cases, the CFD simulations were in good agreement with the experimental data. However, as the transitional compound state between different modes of vibration at various orders, the dynamic ratio of longitudinal and transversal sloshing force became large and errors occurred and became obvious in CFD simulations.