Metallic bellows are commonly used as segments of propellant feedlines for rocket-propelled vehicles to accommodate temperature-induced length variations, manufacturing tolerances, and gimbaling of the engines. These bellows sections deform radially and change volume when internal pressure varies, and the magnitude of such deformation is much higher than that for the straight, cylindrical segments of the line. The greater flexibility, or lesser stiffness, of the bellows, decreases the frequency of acoustic oscillations in the line. These acoustic oscillations are a major factor in the so-called POGO phenomena which have plagued most of the larger liquid rocket-propelled vehicles for many years. A method is developed to calculate the change in volume of a bellows due to a change in internal pressure. Results of an experiment are also presented along with a test-analysis comparison. The computer code is included.
Pressure-Volume Properties of Metallic Bellows
1989
59 pages
Report
Keine Angabe
Englisch
Rocket Engines & Motors , Unmanned Spacecraft , Manned Spacecraft , Bellows , Liquid propellant rocket engines , Pogo effects , Acoustic frequencies , Pressure effects , Volume , Computational fluid dynamics , Computer programs , Finite element method , Flexibility , Mathematical models , Propellant transfer , Sound waves , Stiffness matrix
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|TIBKAT | 1.1868,1; mehr nicht digital.