SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Effective inertia moment and velocity ratio for liquid-filled cylindrical tanks oscillating about longitudinal axis
Low gravity lateral liquid sloshing in hemispherically bottomed cylindrical tank, noting sloshing fundamental frequency reduction
Measured two-dimensional damping forces of baffles with various shapes and perforations are presented for fluid conditions representative of those in liquid-fuel rocket vehicles. The effect of amplitude and frequency of fuel sloshing, and surface proximity on baffle damping are shown. Application of the result sin the prediction of damping effectiveness of ring baffles in cylindrical tanks is demonstrated. Finally, some measurements of damping in a free-free cylindrical tank are presented which verify the predictions based on two-dimensional results. Measurements of certain three-dimensional baffles show that they provide greater damping than ring baffles.
Small amplitude lateral sloshing in cylindrical tank with hemispherical bottom under low gravitational conditions
Simulated low gravity propellant sloshing in spherical, ellipsoidal and cylindrical tanks, discussing Bond number simulation and tank geometry effects
Simulated low gravity propellant sloshing in spherical, ellipsoidal and cylindrical tanks, discussing Bond number simulation and tank geometry effects
Oscillations of elongated spheroidal liquid-vapor interface in circular cylindrical tank rotating in zero gravity
Hydrodynamic theory for breathing vibrations of a partially filled, cylindrical tank, giving natural frequencies of liquid sloshing as well as pressure distribution
Annular baffle for damping liquid oscillations in partially filled cylindrical tank
An experimental investigation was conducted in which the behavior of liquid inflow to a cylindrical tank containing inlet baffles was observed during weightlessness. A single tank radius (2 cm), inlet radius (0.2 cm), and liquid (ethanol)were used. The inlet end of the tank was hemispherical with a 30 deg convergent inlet. All the baffle configurations tested were cylindrically symmetric and mounted coaxially with the tank within the hemispherical end. Both stable and unstable inflow behavior were observed using each baffle. It was found that, depending on which of the baffles was used, the critical inflow velocity at which a transition to unstable inflow began was from 2.5 to 12 times greater than the corresponding velocity in an unbaffled tank.
Simulated low gravity sloshing in cylindrical tanks including effects of damping and small liquid depth
Liquid sloshing cylindrical tank with elastic bottom for investigating surface tension effect at liquid gas interface of partly filled container
Liquid dynamics and hydroelastic sloshing in partially filled right cylindrical tank with rigid side walls and flexible bottom of stretched membrane
Simulated low gravity liquid sloshing in cylindrical tanks, emphasizing small liquid depth and smooth wall viscous damping effects
Finite difference model of low gravity draining of inviscid incompressible liquids from cylindrical tanks with hemispherical bottoms
Two distinct fundamental modes are shown to exist for liquid sloshing in a tilted cylindrical tank. The 'long' mode is excited by tank motions parallel to the long axis of the elliptical free surface, the 'short' mode by tank motions perpendicular to it. Experiments show that the natural frequencies of both modes decrease as the tilt increases, and the slosh damping decreases markedly with increased tilt for the long mode.
An experimental investigation was performed to determine the characteristics of liquid inflow to initially empty cylindrical tanks in a low gravity environment. The acceleration was varied so that Bond numbers based on the inlet radius varied from 0.059 to 2.80. The liquid entered the tank as a jet that grew to a maximum height and then decreased in height with respect to the bottom of the tank, with the liquid from the jet collecting in the bottom of the tank. The maximum jet heights were correlated in terms of the Weber number and the Bond number.
An investigation was conducted to determine the pressure loads and damping associated with rigid ring baffles in relatively large cylindrical tanks. The radial and circumferential pressure distribution, as well as the damping, was measured on a ring baffle subjected to fundamental antisymmetric slosh in a 284-cm-diameter rigid tank. Experimental and analytical data are presented as a function of slosh velocity or amplitude, baffle spacing, and baffle locations both above and below the liquid surface. Results suggest that pressure distributions and damping values can be determined from available theories for the design of single and multiple baffle configurations.