Damping seals for turbomachinery

Damping seals for turbomachinery by George L Von Pragenau Download PDF EPUB FB2

Seal performance is one of the most important issues in a high-pressure turbo-compressor. The seal type and details can influence its rotordynamics behavior and overall stability.

Generally, traditional labyrinth seals provide much lower levels of stiffness, damping and forces, which usually do not influence the rotordynamics and the damping.

The forces generated by this type of seal. Damping seals for turbomachinery. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Material Type: Government publication, National government publication: Document Type: Book.

These seals have been shown to provide a remarkable amount of direct damping to attenuate vibration in turbomachinery, but they generally leak more than conventional labyrinth seals if both seals have the same Damping seals for turbomachinery book : Hector E.

Laos, John M. Vance, Steven E. Buchanan. This paper presents measured frequency dependent stiffness and damping coefficients for bladed and 8-bladed pocket damper seals (PDS) subdivided into four different seal configurations. Rotating experimental tests are presented for inlet pressures at 69 bar ( psi), a frequency excitation range of 20– Hz, and rotor speeds up to Cited by: Imparts the theory and analysis regarding the dynamics of rotating machinery in order to design such rotating devices as turbines, jet engines, pumps and power-transmission shafts.

Takes into account the forces acting Damping seals for turbomachinery book machine structures, bearings and related components. Provides numerical techniques for analyzing and understanding rotor systems with examples of actual designs.

This paper presents a first venture into quantifying stiffness and damping coefficients for turbomachinery seals in multiphase flow using Computational Fluid Dynamics (CFD). The study focusses on the simplest seal type: the smooth annular seal. The present work presents a theoretical approach for the analysis of textured annular “damper” seals.

The data for the seal were extracted from the work of Childs and Fayolle (ASME J. Tribol. (1), pp. 42–49).The texture of the stator consists of equally spaced cylindrical holes of an order of magnitude larger than the seal clearance.

Predictions of damping and inertia coefficients as a function of journal static eccentricity, (L/D) ratio, and end seal coefficient. XLSFDFEM (San Andrés) Single land finite length SFD operating with a circular centered orbit.

FE model for dampers with various types of end seals. Code predicts damping coefficients only. Seals are also used to prevent oil migration from the gear box into the process flow. Typical seals used for air and nitrogen applications are labyrinth seals and carbon ring seals or a combination of the two.

Dry gas face seals are used mainly in process gas applications. Labyrinth seals. Here is the list of books which will help you to learn turbomachinary from basics to advance. Turbomachinary performance analysis by R I Lewis.

Fluod thermodynamics of Turbomachinary by S L Dixon. Principles of Turbomachinary by Seppo. A new type of labyrinth gas seal for damping vibration and whirl, called the TAMSEAL, has been evaluated in both nonrotating and rotating tests at Texas A&M University.

Test results of the prototype, along with comparison tests of a conventional labyrinth seal, show up to times more direct damping than the conventional bladed seal. Seals have larger clearances than load carrying fluid film bearings. Yet their impact on the rotordynamics of turbomachinery is of importance since seals are located at rotor locations where large vibrations (rotor elastic deflections) occur, as shown in Figure 6.

Interstage Seal Impeller Eye Seal Balance Piston Seal. Rotordynamics is the study of the vibration characteristics of a rotating shaft supported on bearings. In almost all cases, the object is to predict and then reduce or eliminate actual rotor vibrations.

A rotor spinning frictionlessly on a perfect axis of rotation with zero lateral and axial vibrations would be the geometric ideal. This condition is also preferred for reducing tip clearances. STABILIZATION OF TURBOMACHINERY WITH SQUEEZE FILM DAMPERS - THEORY AND APPLICATIONS E. GUNTER, BSME, MSEM, PhD EM, The steady-state equations are used to determine the damper equivalent stiffness and damping coefficients.

The coefficients are used to find the damper configuration which will provide the It is often aggravated by seals. The level of Q depends on the amount of energy absorption, called "damping", which takes place between hits. In an automobile body, this damping is provided by the shock absorbers.

In a pump, it is provided mostly by the bearings and the liquid trapped between the rotor and stator in “annular seals” like the wear rings and balance piston.

SELECTION OF TURBOMACHINERY-CENTRIFUGAL COMPRESSORS by Gary A. Ehlers Senior Supervising Engineer When gas seals replace the oil film seals, this source of damping is removed.

Another source of damping needs to be added to replace this friction damping. If not, the shaft will tend to be The API Technical Data Book [3] also.

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The seal ring is excited by lateral/pitch vibration from the rotor/housing. The model includes a frequency dependent stiffness and damping model for the O-ring and a frequency independent model for the fluid film.

The dynamic coefficients are speed and frequency dependent. The mechanical seal is modeled after a typical FMR mechanical seal. Turbo Lab seal update increases damping effectiveness. A Turbomachinery Laboratory invention is getting a new twist.

The pocket damper seal was created at the Turbo Lab as an alternative to the labyrinth seal. The Turbomachinery Research Consortium (TRC). Labyrinth seals are the most commonly used seal in the turbomachinery due to its simple structure and ease of manufacturing.

The results showed that the direct stiffness and damping. related to rotordynamics and vibrations, and author of the book, Turbomachinery Rotordynamics. He is currently carrying out tests on honeycomb and hole-pattern gas damper seals for a damper seal is a patented device with damping values that can be a hundred times higher than a standard labyrinth seal.

Recent test. Turbomachinery and Aerospace dream-team is formed in European Space Race. Learn More. Rotor Rubs (rubbing against blades, seals, etc.) The undamped critical speed analysis looks at the rotor’s behavior if there were no external forces or damping. It can be thought of as the preliminary estimation of the machine’s critical speeds and.

Compared with conventional radial rim seal, the groove rim seals can increase the sealing effectiveness obviously.

It is shown that the groove structures improve the damping dissipation of invading gas. The number of grooves has an obvious effect on sealing effectiveness of circumferential groove rim seals.