Energy Dissipation of Liquids in Nutating Spherical Tanks Measured by a Forced Motion-Spin Table

A specially constructed drive table is described that can spin and nutate scale-model propellant tanks. Results of typical tests are given in which the liquid resonant frequencies and liquid forces and moments are presented as a function of spin rate, nutation frequency, nutation cone angle, liquid...

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Bibliographic Details
Main Authors: Zedd, Michael F, Dodge, Franklin T
Format: Report
Language:English
Subjects:
AIRCRAFT
AIRCRAFT EQUIPMENT
DASHPOTS
DISSIPATION
ENERGY
Fluid Mechanics
FREQUENCY
Fuels
INTERNAL WAVES
LIQUIDS
MOMENTS
MOTION
PE30000N
PROPELLANT TANKS
PROPELLANTS
RESONANCE
RESONANT FREQUENCY
SCALE MODELS
SLOSHING
SPHERES
SPINNING(MOTION)
VISCOSITY
WUEX080165
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Description
Summary:A specially constructed drive table is described that can spin and nutate scale-model propellant tanks. Results of typical tests are given in which the liquid resonant frequencies and liquid forces and moments are presented as a function of spin rate, nutation frequency, nutation cone angle, liquid filling level, and liquid viscosity. Also described is an empirical mechanical model composed of a pendulum, a rotor, and dashpots that simulate the liquid resonances (slosh and inertial waves) and the liquid forces and moments. The parameters of the model are determined from the propellant motions. Keywords: spherical tanks; prolate spinning aircraft.