Journal ArticleDOI
Theory Versus Experiment for the Rotordynamic Coefficients of Labyrinth Gas Seals: Part I—A Two Control Volume Model
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TLDR
In this article, a two-control-volume model for compressible flow in a labyrinth seal is derived for small motion about a centered position by an expansion in the eccentricity ratio.Abstract:
The basic equations are derived for a two-control-volume model for compressible flow in a labyrinth seal. The recirculation velocity in the cavity is incorporated into the model for the first time. The flow is assumed to be completely turbulent and isoenergetic. The wall friction factors are determined using the Blasius formula. Jet flow theory is used for the calculation of the recirculation velocity in the cavity. Linearized zeroth- and first-order perturbation equations are developed for small motion about a centered position by an expansion in the eccentricity ratio. The zeroth-order pressure distribution is found by satisfying the leakage equation while the circumferential velocity distribution is determined by satisfying the momentum equations. The first-order equations are solved by a separation of variable solution. Integration of the resultant pressure distribution along and around the seal defines the reaction force developed by the seal and the corresponding dynamic coefficients.read more
Citations
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Journal ArticleDOI
Application of Computational Fluid Dynamics Analysis for Rotating Machinery—Part II: Labyrinth Seal Analysis
TL;DR: In this paper, the rotordynamic force of a labyrinth seal was calculated using a commercial CFD program and further compared with an existing bulk flow computer program currently used by major US machinery manufacturers.
Journal ArticleDOI
Rotordynamic Coefficients for a Tooth-on-Stator Labyrinth Seal at 70 Bar Supply Pressures: Measurements Versus Theory and Comparisons to a Hole-Pattern Stator Seal
Arthur Picardo,Dara W. Childs +1 more
TL;DR: Rotor dynamic and leakage coefficients are presented for a labyrinth seal that was tested at a supply pressure of 70 bar-a and speeds up to 20,200 rpm as mentioned in this paper, and the results show that the one-control volume model provides a conservative prediction for effective damping; i.e., this parameter is underestimated.
Journal ArticleDOI
Multiple Frequencies Elliptical Whirling Orbit Model and Transient RANS Solution Approach to Rotordynamic Coefficients of Annual Gas Seals Prediction
Zhigang Li,Jun Li,Xin Yan +2 more
Journal ArticleDOI
Numerical analysis of nonlinear rotor–seal system
TL;DR: In this article, an efficient and high-precision direct integration scheme based on the 2 N type algorithm for the computation of exponential matrices is presented for the rotor-seal system.
Book
Leakage and rotordynamic effects of pocket damper seals and see-through labyrinth seals
Gamal Eldin,Ahmed Mohamed +1 more
TL;DR: Eldin et al. as mentioned in this paper discussed the leakage and rotordynamic characteristics of pocket damper seal (PDS) and see-through labyrinth seal and compared these seals to other annular gas seals.
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