Research on Fluid Elasticity in Space Flight Vehicle.

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It is well-known that thin-walled elastic channel conveying fluid, such as liquid fuel pipings of space vehicles, show very complicated static and dynamic phenomena, including self-excited oscillation, due to the coupling between the fluid pressure and the elastic deformation of the channel walls. Many theoretical and experimental studies have been carried out to investigate such behavior of the flow-channel. Not only in the space vehicles, the fluid-conveying channels have many applications in chemical plants, atomic energy power stations and medical treatments. There are, however, no reliable fundamental data on the relation between the wall deformation and the fluid pressure along the channel.In the experimental part of the present study, therefore, a two- dimensional flow channel was built to measure along the channel the flow pressure at a number of points on the channel wall. A one-side of the channel walls can statically or harmonically be moved by an external piston, while the … More other wall is rigid and fixed. Measurement on the pressure was made with the flow rate being fixed. Numerical calculations based on a one-dimensional flow channel analysis was performed to compare with measured results on the relation between the fluid pressure and the flow rate. Comparison between the numerical and experimental results provides useful information for improving the previous analytical channel- flow model proposed by the present researchers.In the analytical part of this study, stability and bifurcation of a double pendulum subjected to a follower force was examined from a view point of fluid elasticity. The double pendulum models a two-staged rocket propelled by a jet thruster. In this nonlinear stability analysis, used was a differential geometrical approach which has rapidly developed during the last decade. The static and dynamic stability characteristics of the pendulum have fully been clarified. In addition, aperiodic motions of the fluid-conveying channel observed in experiments have been analyzed to possess chaotic characteristics. Less