Liquid Sloshing In Surface Tension Tank Under Microgravity Condition

With the rapid development of space industry,propellant in the proportion of spacecraft is increasing.As space missions become more complex,their attitude and maneuverability are getting higher and higher,which makes us on the operation of spacecraft in the process of shaking the propellant more and more attention.The influence of the position?attitude?orbit of the orbiting vehicle is critical.The heavier the weight of the propellant in the tank,the greater the mass of its jolt,and the lower the nature frequency,between zero hertz and a few hertz,this low frequency of rocking is particularly easy and spacecraft structural vibration or control system characteristics of the frequency coincide with the adverse impact on spacecraft.The large amount of liquid propellant shaking is also easy to product interference force and torque on the spacecraft,and thus have a significant impact on the attitude of the spacecraft.In this paper,the characteristics of liquid sloshing under the condition of prime maintenance are studied from the aspects of theory,experiment and simulation.The main research contents are as follows:Theoretical modeling of liquid sloshing in tank under microgravity.Firstly,the three basic equations of liquid sloshing are simplified,and the kinematic boundary conditions and free surface kinematic boundary conditions of the tank wall are simplified.And then the amplitude,damping,force and moment of the liquid sloshing are obtained,and the frequency of the first order,the second order and the third order are obtained by the programming of the theoretical model of the liquid sloshing.Numerical simulation and verification of liquid sloshing.The tank model was established by using Pro/E.then,the tank model was divided into three parts by ICEM pre-processing software in ANSYS,the numerical simulation was carried out by Fluent software and VOF two-phase flow model was adopted.Firstly,the simulation of liquid sloshing under constant gravity is carried out.Then,the numerical simulation of liquid sloshing and large amplitude sloshing under microgravity is carried out,and the dynamic contact angle need to be considered during the simulation,the self-defined function is loaded in the Fluent,and the influence of the dynamic contact angle on the tank sloshing is analyzed.Experimental design of liquid sloshing.Based on the experimental conditions of the Chinese Academy of Sciences,the experimental device and the experimental method were designed to verify the liquid sloshing.The experimental design laid a good foundation for the follow-up work.The theoretical analysis numerical and experimental design were carried out to analyze the sloshing characteristics of the liquid under the microgravity.The theoretical model was obtained and verified by numerical simulation and experiment.It enriched the micro-gravity.The research contents of the sloshing in the tank are of great significance both in engineering and theoretical research.