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Theoretical approach to obtaining dynamic characteristics of noncontacting spiral-grooved seals
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Yang, Bo-Suk Ibaraki, Ryuji Iwatsubo, Takuzo |
| Copyright Year | 1987 |
| Description | The dynamic characteristics of spiral-grooved seals are theoretically obtained by using the Navier-Stokes equation. First, with the inertia term of the fluid considered, the flow and pressure in the steady state are obtained for the directions parallel to and perpendicular to the groove. Next, the dynamic character is obtained by analyzing the steady state and by analyzing the labyrinth seal. As a result, the following conclusions were drawn: (1) As the land width becomes shorter or the helix angle decreases, the cross-coupling stiffness, direct and cross-coupling damping, and add mass coefficients decrease; (2) As the axial Reynolds number increases, the stiffness and damping coefficients increase. But the add mass coefficient is not influenced by the axial Reynolds number; (3) The rotational Reynolds number influences greatly the direct and cross-coupling stiffness and direct damping coefficients; and (4) As the journal rotating frequency increases, the leakage flow decreases. Therefore zero net leakage flow is possible at a particular rotating frequency. |
| File Size | 896400 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870012774 |
| Archival Resource Key | ark:/13960/t9n34r63z |
| Language | English |
| Publisher Date | 1987-01-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Leakage Damping Navier-stokes Equation Seals Stoppers Dynamic Characteristics Cross Coupling Reynolds Number Stiffness Grooves Steady State Labyrinth Seals Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
