Abstract
Purpose. Research of hydrodynamic mechanism of internal fuel flows in the spacecraft tanks with internal baffles for effective control. Methodology and approach. In the paper it is shown experimental and numerical simulation results of internal fuel flows in the spacecraft tanks with internal baffles, moving on the Earth's orbit. The structure of near wall flows - wall region, wake, around the baffle edges etc are shown. There are several cases that are shown for one, two and many vorticies or circulations around the baffles and outside of them, that characterize the energetic parameters of inertial flows in the tanks. The analysis of the structure and nature of circulating flows in the range of Reynolds numbers 700 ... 12500is presented, which allows to make a picture of axially symmetric circulation flow and rationally arrange the guide baffles in the inertial fuel flows. So, this provides to make a rational choise of effective facilities for compensating the disturbing influences on the tank walls by the fluid and substantial savings in spacecrafts long term flight at the Earth orbit.
Highlights
During the spacecraft flight on the Earth's orbit with the cut-off power engines the inertial effects of liquid fuel flows in reservoirs acts on its structure
To improve efficiency on exposure to uncontrolled fluid flow in the internal fuel tanks stabilizing devices used in the form of annular and radial baffles on wall surface, which serve as guide vanes, but have a sufficiently large mass and size, reducing the payload of the spacecraft
The analysis results of this study revealed that in the range of Reynolds numbers of 700...12500 in spherical tanks of spacecraft might be axisymmetric laminar flow of liquid fuel, the presence of stable circulation, which creates resentment and dynamic loads on the wall
Summary
During the spacecraft flight on the Earth's orbit with the cut-off power engines the inertial effects of liquid fuel flows in reservoirs acts on its structure They tend to cause instability of spacecraft motion and its deviation from the nominal trajectory, and can be the cause of accidents on board. Determination using them unsteady velocity distribution pattern directly about partitions and free space flow structure allows to set specific layers of a moving liquid in tanks with different variations. These parameters, in turn, can set the features of their influence on the inertial flow at different similarity numbers and extend the results of physical modeling of real structures and modes of objects movement. The main number of similarity seems centrifugal Reynolds number, built on the values of tank initial angular velocity Ω0, the distance from the axis of rotation R and the fluid coefficient of kinematic viscosity ν
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