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Influence of impeller shroud forces on turbopump rotor dynamics
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Childs, Dara W. Williams, J. P. |
| Copyright Year | 1993 |
| Description | The shrouded-impeller leakage path forces calculated by Childs have been analyzed to answer two questions. First, because of certain characteristics or the results of Childs, the forces could not be modeled with traditional approaches. Therefore, an approach has been devised to include the forces in conventional rotordynamic analyses. The forces were found to be well-modeled with this approach. Finally, the effect these forces had on a simple rotor-bearing system was analyzed, and, therefore, they, in addition to seal forces, were applied to a Jeffcott rotor. The traditional methods of dynamic system analysis were modified to incorporate the impeller forces and yielded results for the eigenproblem, frequency response, critical speed, transient response, and an iterative technique for finding the frequency of free vibration as well as system stability. All results lead to the conclusion that the forces have little influence on natural frequency but can have appreciable effects on system stability. Specifically, at higher values of fluid swirl at the leakage path entrance, relative stability is reduced. The only unexpected response characteristics that occurred are attributed to the nonlinearity of the model. |
| File Size | 1174728 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940022875 |
| Archival Resource Key | ark:/13960/t0dv6fz67 |
| Language | English |
| Publisher Date | 1993-12-10 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Leakage Transient Response Free Vibration Structural Vibration Centrifugal Pumps Systems Analysis Hydrodynamic Coefficients Shrouded Turbines Rotor Dynamics Turbine Pumps Resonant Frequencies Impellers Flow Distribution Nonlinearity Stiffness Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
