Abstract

The sloshing of fuel inside the tank is an important issue in aerospace and automotive applications. This phenomenon, in fact, can cause various issues related to vehicle stability and safety, to component fatigue, audible noise, vibrations and to the level measurement of the fuel itself. The sloshing phenomenon can be defined as a highly nonlinear oscillatory movement of the free-surface of liquid inside a container, such as a fuel tank, under the effect of continuous or instantaneous forces. This paper is the result of a research collaboration between the Industrial Engineering Department of the University of Naples “Federico II” and the R&D department of Fiat Chrysler Automobiles (F.C.A.) The activity is focused on the study of the sloshing in the fuel tank of vehicles. The goal is the optimization of the tank geometry in order to allow, for example, the correct fuel suction under all driving conditions and to prevent undesired noise and vibrations. This paper shows results obtained on a reference tank filled by water tinted with a dark blue food colorant. The geometry has been tested on a test bench designed by Moog Inc. on specification from Fiat Chrysler Automobiles with harmonic excitation of a 2D tank slice along one degree of freedom. The test bench consists of a hexapod with six independent actuators connecting the base to the top platform, allowing all six Degrees of Freedom (DOFs). On the top platform there are other two additional actuators to extend pitch and roll envelope, thus the name of “8-DOF bench”. The designed tank has been studied with a three-dimensional Computational Fluid Dynamics (CFD) modeling approach, too. By the end, the numerical and experimental data have been compared with a post-processing analysis by means of Matlab® software. For this reason, the images have been reduced in two dimensions. In particular, the percentage gaps of the free surfaces and the center of gravity have been compared each other. The comparison, for the three different levels of liquid tested, has shown a good agreement with a discrepancy always less than 3%.

Highlights

  • Nowadays the sloshing of fuel inside the tank of vehicles is a very important research issue

  • Simulations have been run for the three tested water levels (65 mm, 101 mm and 165 mm) and at both values of frequency, 0.5 Hz and 0.7 Hz, in order to replicate experiments done on the F.C.A. test bench

  • A numerical and experimental study on the sloshing phenomenon inside a vehicle fuel tank has been described in this paper

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Summary

Introduction

Nowadays the sloshing of fuel inside the tank of vehicles is a very important research issue. The sloshing phenomenon can be defined as the motion of the free surface of a liquid in a partially filled tank. The motion of the vehicle during the travelling is another important aspect that has to be taken into account in the sloshing analysis because with high acceleration, cornering and braking fluid inside the tank is forced to move. The individuation of a robust numerical model able to predict the free surface motion of a liquid is of great interest to the scientific community. For this reason, many researchers have investigated sloshing phenomena with modeling and experimental approaches. A similar study has been carried out with the Flow-3D code [16]

Experimental Set-Up
The tank has been filled
Images Post-Processing
Numerical Model Description
Results and Model
Test 1
Test 2
13. Comparison
Test 3
In this the comparison a maximum error percentage equal
Conclusions
Full Text
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