Experimental Results from a Sensor Brush Seal

2010 ◽  
Author(s):  
Eric Ruggiero
Keyword(s):  
Experimental Results ◽  
Brush Seal

scholarly journals Brush seal with thermo-regulating bimetal elements

2018 ◽  
Vol 8 (1) ◽  
pp. 307-313 ◽  
Author(s):  
Michał Stanclik
Keyword(s):  
Heat Flux ◽  
Contact Area ◽  
Heat Load ◽  
Experimental Results ◽  
Frictional Heat ◽  
Brush Seal ◽  
Thermoregulatory Function ◽  
Shaft Surface

Abstract This paper presents a new brush seal construction idea. It was shown that it is possible to use bimetallic elements for the construction of the brush seal, which have a thermoregulatory function by relieving a contact area between bristles and a shaft surface reducing frictional heat flux. This should improve the durability of the seal by diminishing the heat load and significantly decreases the temperature of the seal during the startup/ shutdown. This article shows a simplified construction of the concept brush seal as well as numerical and experimental results.

scholarly journals Theoretical Analysis of Brush Seals Leakage Using Local Computational Fluid Dynamics Estimated Permeability Laws

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Lilas Deville ◽  
Mihai Arghir
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Reynolds Number ◽  
Principal Direction ◽  
Experimental Results ◽  
Leakage Flow ◽  
Cfd Analysis ◽  
Brush Seal ◽  
Brush Seals ◽  
Local Reynolds Number

Brush seals are a mature technology that has generated extensive experimental and theoretical work. Theoretical models range from simple correlations with experimental results to advanced numerical approaches coupling the bristles deformation with the flow in the brush. The present work follows this latter path. The bristles of the brush are deformed by the pressure applied by the flow, by the interference with the rotor and with the back plate. The bristles are modeled as linear beams but a nonlinear numerical algorithm deals with the interferences. The brush with its deformed bristles is then considered as an anisotropic porous medium for the leakage flow. Taking into account, the variation of the permeability with the local geometric and flow conditions represents the originality of the present work. The permeability following the principal directions of the bristles is estimated from computational fluid dynamics (CFD) calculations. A representative number of bristles are selected for each principal direction and the CFD analysis domain is delimited by periodicity and symmetry boundary conditions. The parameters of the CFD analysis are the local Reynolds number and the local porosity estimated from the distance between the bristles. The variations of the permeability are thus deduced for each principal direction and for Reynolds numbers and porosities characteristic for brush seal. The leakage flow rates predicted by the present approach are compared with experimental results from the literature. The results depict also the variations of the pressures, of the local Reynolds number, of the permeability, and of the porosity through the entire brush seal.

Simulation and Testing on Performance of the Woven Brush Seal in Vacuum Environment

2016 ◽  
Author(s):  
Farong Du ◽  
Zheng Xu ◽  
Fenzhu Ji ◽  
Yu Zhou
Keyword(s):  
Porous Medium ◽  
Boundary Conditions ◽  
Finite Volume ◽  
Calculation Method ◽  
Rotational Speed ◽  
Labyrinth Seal ◽  
Experimental Results ◽  
Actual Situation ◽  
Brush Seal

The liquid lubrication is one of the most common lubrication modes in long-term space equipment, the sealing for liquid lubricants is thus important. Woven brush seal is motived by contact, which is able to achieve zero gap and thus have better performance than others. In this paper, we propose a woven brush seal system based on the model of porous medium with deformation of woven brush wire in anisotropic. For estimating the leakage and verifying availability of our system, we build calculation models by employing finite volume k-epsilon model and SIMPSON calculation method. Additionally, we run both simulation and experiments to evaluate our system, the calculation and experimental results show that: the leakage is much lower than traditional labyrinth seal, the amount of leakage increases gradually with the increase of rotational speed. The calculation method and boundary conditions are consistent with the actual situation. Namely, woven brush is able to satisfy the requirements in vacuum environment and thus considered as the corresponding seal component.

Measured Influence of Clearance and Eccentricity on Brush Seal Leakage Characteristics

2020 ◽  
Author(s):  
Manish R. Thorat ◽  
Brian Bauer
Keyword(s):  
Experimental Results ◽  
Labyrinth Seals ◽  
Blow Down ◽  
Interference Fit ◽  
Leakage Model ◽  
Rotation Direction ◽  
Brush Seal ◽  
Leakage Characteristics ◽  
Brush Seals ◽  
Initial Clearance

Abstract Brush seals are used in turbomachinery for reduced leakage as compared to conventional seals such as labyrinth seals. Early applications tended to favor having a line-to-line to a slight interference fit of the bristles to the shaft, but more recent applications have favored the use of a slight initial clearance fit for the purpose of reducing bristle wear. In these brush seals with clearance, the phenomenon of bristle blow-down largely negates the leakage degradation due to clearance, with bristles bending to reduce the clearance gap. This paper presents experimental results for a 10.5 inch bore brush seal with 0.0028 inch bristle diameter. Bristle blow-down is characterized with measurements at three different clearances then compared to a calibrated brush seal leakage model. Tolerances in brush installation may lead to a brush seal bore that is eccentric to the rotor. The influence of this seal eccentricity on measured leakage performance is also characterized in the paper. Seal eccentricities up to 55% of brush fence height are tested. Effective clearances for eccentric operation are estimated from the measurements. Brush seals are described as unidirectional seals because the bristles have a lay angle in the direction of rotation. This paper also investigates the influence of rotation direction on measured leakage performance of brush seal. This influence is characterized by non-pressurized reverse rotation operation and measurement of leakage performance prior to and after reverse rotation operation.

scholarly journals An Iterative CFD and Mechanical Brush Seal Model and Comparison With Experimental Results

1998 ◽  
Author(s):  
L. H. Chen ◽  
P. E. Wood ◽  
T. V. Jones ◽  
J. W. Chew
Keyword(s):  
Pressure Distribution ◽  
Mechanical Model ◽  
Experimental Results ◽  
Iterative Technique ◽  
Mechanical Part ◽  
Contact Loads ◽  
Brush Seal ◽  
Mass Flows ◽  
Frictional Effects

The position of the bristles within a brush seal is dictated by the pressure distribution within the seal, which is itself influenced by the position of the bristle matrix. In order to predict mass flows, pressure capabilities, bristle displacements, stresses and contact loads at the rotor interface a technique for iterating between a CFD and a mechanical model has been developed. The iterative technique is used to model the behaviour of seals with an initial build clearance, where the application of pressure causes a change in the position of the bristle matrix. Frictional effects between neighbouring bristles and at the backing ring influence the behaviour of the bristles and these are accounted for within the mechanical part of the model. Results are presented and discussed for seals of both initial build clearance and interference. The mathematical predictions for flow, contact loads at the rotor interface and the nature of the bristles displacements are compared with experimental results.

An Iterative CFD and Mechanical Brush Seal Model and Comparison With Experimental Results

1999 ◽  
Vol 121 (4) ◽  
pp. 656-662 ◽  
Author(s):  
L. H. Chen ◽  
P. E. Wood ◽  
T. V. Jones ◽  
J. W. Chew
Keyword(s):  
Pressure Distribution ◽  
Mechanical Model ◽  
Experimental Results ◽  
Iterative Technique ◽  
Mechanical Part ◽  
Contact Loads ◽  
Brush Seal ◽  
Mass Flows ◽  
Frictional Effects

The position of the bristles within a brush seal is dictated by the pressure distribution within the seal, which is itself influenced by the position of the bristle matrix. In order to predict mass flows, pressure capabilities, bristle displacements, stresses, and contact loads at the rotor interface, a technique for iterating between a CFD and a mechanical model has been developed. The iterative technique is used to model the behavior of seals with an initial build clearance, where the application of pressure causes a change in the position of the bristle matrix. Frictional effects between neighboring bristles and at the backing ring influence the behavior of the bristles and these are accounted for within the mechanical part of the model. Results are presented and discussed for seals of both initial build clearance and interference. The mathematical predictions for flow, contact loads at the rotor interface, and the nature of the bristles displacements are compared with experimental results.

Contact Force Measurements Under a Brush Seal

1995 ◽  
Author(s):  
Christopher A. Long ◽  
Yannis Marras
Keyword(s):  
Theoretical Model ◽  
Contact Force ◽  
Experimental Results ◽  
Experimental Techniques ◽  
Force Measurements ◽  
Rotating Shaft ◽  
Simple Theoretical Model ◽  
Brush Seal ◽  
Torque Measurements ◽  
Theoretical Predictions

This paper discusses results of experiments carried out to measure the bristle contact force of a brush seal on a shaft. Two separate experimental techniques were used: i) indirectly through torque measurements and ii) directly using a force blade located under the bristle tips. The tests were conducted on a non-rotating shaft having a nominal diameter of 122 mm, with static radial interferences of 0.4, 0.2, 0.1 and 0.05 mm; and for the range of pressure ratios 1 to 4.5. The experimental results obtained from these measurements are compared with predictions from a simple theoretical model. Although there are some large differences, the experimental results do show some agreement with the theoretical predictions. However, both this current simple theoretical model and the experiments have their limitations. Despite these shortcomings, the experimental results are considered to support the qualitative value of the current theoretical model.

scholarly journals Preliminary experimental results for a cryogenic brush seal configuration

1993 ◽  
Author(s):  
J. CARLILE ◽  
R. HENDRICKS ◽  
R. HIBBS ◽  
S. MCVEY ◽  
J. SCHARRER
Keyword(s):  
Experimental Results ◽  
Brush Seal

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

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