1317. Mass Properties of Fluids in Large Containers


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L T Hassman: 1317. Mass Properties of Fluids in Large Containers. 1979.



This paper presents a method of determining the mass properties of fluids in an enclosed container during the ascent phase of launch into earth orbit. The Space Shuttle external tank was selected as the model for computing the mass properties of fluids. The external tank consists of a liquid oxygen tank and a liquid hydrogen tank. The liquid oxygen tank has three geometric shapes: forward section is an ogive, the center section is cylindrical, and the aft bulkhead is an elliptical shape. The liquid hydrogen tank has a forward and aft elliptical bulkhead with a cylindrical section joining the two bulkheads. The standard equations for the external tank shapes were programmed for the Hewlett-Packard Model 9830 computer to define the geometry. A subroutine was developed to compute the mass properties of the fluids from being a solid to no element inertia about its centroid. Computations were based on one inch increments along the X-axis of the external tank.
The resulting mass properties were compared with the shuttle mass properties developed from a method resented in an article, ‘Analytical Presentation of Lateral Sloshing by Equivalent Mechanical Models’ by Franklin T. Dodge of the University of Tennessee, which was published in NASA SP-106 ‘The Dynamic Behaviors’ of Liquids in Moving Containers with Application to Space Vehicle Technology. ‘


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