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Numerical and analytical study of fluid dynamic forces in seals and bearings
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hendricks, R. C. Mullen, R. L. Muszynska, A. Braun, M. J. Przekwas, A. J. Tam, L. T. |
| Copyright Year | 1987 |
| Description | A numerical model based on a transformed, conservative form of the three dimensional Navier-Stokes equation and an analytical model based on lumped fluid parameters are presented and compared with studies of modeled rotor bearing seal systems. The rotor destabilizing factors are related to the rotative character of the flow field. It is shown that these destabilizing factors can be reduced through a decrease in the fluid average circumferential velocity. However, the rotative character of the flow field is a complex three dimensional system with bifurcated secondary flow patterns that significantly alter the fluid circumferential velocity. By transforming the Navier-Stokes equations to those for a rotating observer and using the numerical code PHOENICS-84 with a nonorthogonal body fitted grid, several numerical experiments were carried out to demonstrate the character of this complex flow field. In general, fluid injection and/or preswirl of the flow field opposing the shaft rotation significantly intensified these secondary recirculation zones and thus reduced the average circumferential velocity; injection or preswirl in the direction of rotation significantly weakened these zones. |
| File Size | 2887271 |
| Page Count | 38 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880009483 |
| Archival Resource Key | ark:/13960/t8vb31q1n |
| Language | English |
| Publisher Date | 1987-09-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Navier-stokes Equation Rotary Stability Seals Stoppers Computational Fluid Dynamics Bearings Flow Distribution Mathematical Models Loads Forces Rotating Shafts 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 |
