Research On Liquid Sloshing In Aircraft Fuel Tank With Sph Technique

With the rapid increasing requirement, large aircraft will be a key solution for the future development of aircraft design. As an indispensable part of the large airplane, integral fuel tank will become much bigger and the sloshing problem in the tanks will impact on the flight performance and tank's structure which needs more attention.Smoothed Particle Hydrodynamics (SPH) is a mesh-free Lagrangian method which is widely used to simulate fluid motion, due to several benefits over traditional grid-based techniques. In this paper, the basic theory of SPH is introduced and based on the kernel approximation, the Navier–Stokes equations are derived to solve sloshing problem with SPH technique.Three-dimensional effects of liquid sloshing in a moving partially filled rectangular tank have been carried out numerically with SPH technique. Comparing with the experiment, the simulation result can truly describe the phenomena of liquid sloshing and the frequencies and pressures show good agreements. Furthermore, liquid sloshing in rectangular tank with baffle has also been studied.The result shows that baffles bring marked inhibition to the liquid sloshing. At last, the simulation of liquid sloshing with different depths in tank shows that the sloshing frequencies of different liquid depths, under the same acceleration load, are close and the deeper case brings bigger impact on tank. The sloshing in aircraft fuel tank is studied with SPH technique for the first time, the motion of a free liquid surface inside the tank is simulated, including standing wave, moving wave, hydraulic jump and breaking wave. The simulation models of fuel and tank are built and the results are given out. As a new method to study the sloshing in aircraft fuel tank, SPH technique shows great advantages and it will be very helpful in the future.