Journal ArticleDOI
Dynamic Characteristics of the Diverging Taper Honeycomb-Stator Seal
Anthony J. Smalley,Massimo Camatti,Dara W. Childs,Justin R. Hollingsworth,Giuseppe Vannini,Jeremy Carter +5 more
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TLDR
In this paper, the authors presented predicted and measured dynamic characteristics, demonstrating how a clearance which diverges axially from inlet to outlet increases the maximum effective damping of a honeycomb-stator seal, even though the average clearance is increased.Abstract:
This paper introduces a variant on the honeycomb-stator seal, which can extend the already strong stabilizing influence of this seal geometry for centrifugal compressors. The paper presents predicted and measured dynamic characteristics, demonstrating how a clearance, which diverges axially from inlet to outlet, increases the maximum effective damping of a honeycomb-stator seal, even though the average clearance is increased. The results also show a strong negative direct stiffness at zero and low frequency for this seal geometry (termed the “Diverging Taper Honeycomb Seal (DTHCS)”). The predictions are made with ISOTSEAL, software developed at The Texas A&M Turbomachinery Laboratory. The test data, also obtained at the Turbomachinery Laboratory, confirms the nature and magnitude of both these dynamic characteristics with close fidelity. However, measured leakage falls significantly below predicted leakage. The frequency dependence of the seal dynamic characteristics and the strong negative static stiffness require careful attention in rotor dynamics analysis.Copyright © 2004 by ASMEread more
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Journal ArticleDOI
Bioinspired engineering of honeycomb structure – Using nature to inspire human innovation
Qian-Cheng Zhang,Xiaohu Yang,Peng Li,Guoyou Huang,Shangsheng Feng,Cheng Shen,Bin Han,Xiaohui Zhang,Feng Jin,Feng Xu,Tian Jian Lu +10 more
TL;DR: A review of the interdisciplinary efforts to better understand the design principles for products with honeycomb structures, including their fabrication, performance (e.g., mechanical, thermal and acoustic properties) as well as optimization design is presented in this article.
Journal ArticleDOI
Rotordynamic Force Coefficients for Three Types of Annular Gas Seals With Inlet Preswirl and High Differential Pressure Ratio
TL;DR: In this article, the rotordynamic force coefficients for three types of noncontact annular gas seals, which include a labyrinth (LABY), honeycomb (HC), and a fully partitioned damper seal (FPDS), were compared on a controlled motion test rig possessing nonsynchronous excitation capability up to 250Hz.
Journal ArticleDOI
Numerical analysis of a nonlinear double disc rotor-seal system
TL;DR: Based on the finite element method (FEM) and the Lagrange equation, a novel nonlinear model of a double disc rotor-seal system, including the coupled effects of the gravity force of the discs, Muszynska's nonlinear seal fluid dynamic force, and the mass eccentricity of the disks, is proposed in this paper.
Journal ArticleDOI
A Design to Improve the Effective Damping Characteristics of Hole-Pattern-Stator Annular Gas Seals
TL;DR: In this article, the authors show that various depth patterns can significantly improve damping pefor- mance in terms of both increasing the seal's effective damping and reducing its crossover frequency.
Journal ArticleDOI
Effects of sealing clearance and stepped geometries on discharge and heat transfer characteristics of stepped labyrinth seals
Xin Yan,Jun Li,Zhenping Feng +2 more
TL;DR: In this article, the effect of sealing clearance and step geometries on the discharge and heat transfer characteristics of the stepped labyrinth seals with honeycomb and smooth lands was investigated and numerically solved.
References
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Journal ArticleDOI
Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings
Journal ArticleDOI
A Test Apparatus and Facility to Identify the Rotordynamic Coefficients of High-Speed Hydrostatic Bearings
Dara W. Childs,Keith Hale +1 more
TL;DR: In this article, a facility and apparatus are described which determine stiffness, damping, and added-mass rotordynamic coefficients plus steady-state operating characteristics of high speed hydrostatic journal bearings.
Journal ArticleDOI
The Acoustic Influence of Cell Depth on the Rotordynamic Characteristics of Smooth-Rotor/Honeycomb-Stator Annular Gas Seals
TL;DR: In this paper, a two-control-volume model is employed for honeycomb-stator/smooth-rotor seals, with a conventional control-volume used for the throughflow and a capacitance-accumulator model for the honeycomb cells.
Journal ArticleDOI
A Comparison of Experimental Rotordynamic Coefficients and Leakage Characteristics Between Hole-Pattern Gas Damper Seals and a Honeycomb Seal
Zeping Yu,Dara W. Childs +1 more
TL;DR: In this paper, hole pattern gas damper seal stators are used to reduce the number of holes in honeycomb annular annular seal and achieve higher effective damping, especially under high speeds and low inlet pressure ratio conditions.
Annular Gas Seals And Rotordynamics Of Compressors And Turbines.
Dara W. Childs,John M. Vance +1 more
TL;DR: In this article, the potential negative or positive impact of annular seal on rotordynamics of compressors and steam turbines is discussed and the nature of destabilizing forces that can be developed by "seethrough" and interlocking labyrinths is discussed.
Related Papers (5)
A study of the effects of inlet preswirl on the dynamic coefficients of a straight-bore honeycomb gas damper seal
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Rotordynamic-Coefficient and Leakage Characteristics for Hole-Pattern-Stator Annular Gas Seals—Measurements Versus Predictions
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