Research On Fuel Sloshing Of Fuel Tank Truck With SPH Method

Liquid sloshing problem widely exists in industry of aerospace,ship and highway transportation.Oil tank truck's loading capacity of liquid is high,when braking,fuel sloshing will occur intensely,which will have a bad effect on the truck.On the one hand,circular and repetitive impact load emerges in liquid sloshing brings fatigue damage to head of tank body and baffles.On the other hand,the lateral force caused by sloshing and the changing position of the center of gravity of the oil easily affects the driving stability of the vehicle.With the improvement of vehicle's loading capacity,the volume of tank body will get bigger.So the effect of liquid sloshing should not be ignored and the research on fuel sloshing of fuel tank has great engineering application value.The SPH(Smoothed Particle Hydrodynamics)method is a mesh free method for solving mechanical equations.It uses a group of particles rather than a traditional mesh partition to discretize the structure.The method will goodly solve fuel sloshing problem with large free surface deformations.However,the ALE and Lagrange schemes of finite element method are often deficient in efficiency and precision.Based on the SPH method,the liquid sloshing calculation model of 3D rectangular tank under random acceleration excitation was established and solved.The results showed that the simulation method can simulate the liquid sloshing truly and effectively.Compared with the simulation results based on the ALE method,it was found that the simulation method had better compliance and could effectively simulate liquid surface's non-linear phenomenon,like surface roll and broken,produced by severe sloshing.Furthermore,the simulation of the liquid sloshing of the rectangular tank under the change of the sinusoidal velocity was carried out.It was found that the variation of the liquid level was regular,and the artificial compression rate could effectively overcome the liquid level oscillation.Secondly,the SPH method was used to simulate the fuel sloshing in the fuel tank with different filling ratios.The variation law of the free liquid surface under the braking condition and the impact stress of the fuel on the head of tank body and the baffles of the tank were obtained.The influence of the different filling ratio on the violent degree of the sloshing was summarized.The research work in this paper will lay the foundation for the further optimization of the baffles and the reduction of the violent degree of liquid sloshing.