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Determination of rotordynamic coefficients for labyrinth seals and application to rotordynamic design calculations
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Weiser, P. Nordmann, R. |
| Copyright Year | 1991 |
| Description | In today's rotordynamic calculations, the input parameters for a finite element analysis (FEA) determine very much the reliability of eigenvalue and eigenmode predictions. While modeling of an elastic structure by means of beam elements etc. is relatively straightforward to perform and the input data for journal bearings are usually known exactly enough, the determination of stiffness and damping for labyrinth seals is still the subject of many investigations. Therefore, the rotordynamic influence of labyrinths is often not included in FEA for rotating machinery because of a lack of computer programs to calculate these parameters. This circumstance can give rise to severe vibration problems especially for high performance turbines or compressors, resulting in remarkable economic losses. The forces generated in labyrinths can be described for small motions around the seal center with a linearized force-motion relationship. Several years ago, we started with the development of computer codes for the determination of rotordynamic seal coefficients. Our different approaches to evaluate the dynamic fluid forces generated by turbulent, compressible seal flow are introduced. |
| File Size | 575524 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920005142 |
| Archival Resource Key | ark:/13960/t7kq2x55t |
| Language | English |
| Publisher Date | 1991-10-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Turbulent Flow Vibration Computational Fluid Dynamics Compressors Coefficients Machinery Labyrinth Seals Computer Programs Finite Element Method Navier-stokes Equation Rotor Dynamics Vibration Damping Turbulence Models Eigenvalues Stiffness Turbines Compressible Flow Journal Bearings Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
