Simulation of flow and heat transfer in the tip region of a brush seal

Chew, John W.; Guardino, C.

doi:10.1016/j.ijheatfluidflow.2003.12.001

Cited by 29 publications

(9 citation statements)

References 12 publications

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“…The porosity E of bristle pack is the ratio of the voids volume to the total volume (voids and bristles), it can be represented as following expression: (9) Considering that the leakage flow across the bristle pack is similar to the flow through a packed bed, this article introduced the Ergun equation [21] to estimate the flow resistance coefficients of the bristle pack.…”

Section: Calibration Of Porosity and Resistance Coefficientsmentioning

confidence: 99%

“…They developed a theoretical analysis system to predict the bristle temperatures with rotor surface temperature as an input condition. Chew and Guardino [9] numerically simulated the flow and heat transfer in the bristle tip region. Their computational model included heat conduction as well as frictional heat generation between bristle tips and rotor surface.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Qiu¹,

2013

Journal of Heat Transfer

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Brush seals have been applied in more and more challenging high-temperature locations. The high speed bristle-rotor friction causes a considerable heat generation which accelerates the bristles wear. The frictional heat generation at bristle-rotor interface becomes another major concern in brush seal applications. This study presented detailed investigations on the heat transfer characteristics and contact mechanics of brush seals using a combined computational fluid dynamics (CFD) and finite element method (FEM) brush seal model. The CFD model of brush seal for mass and heat transfer employed Reynoldsaveraged Navier-Stokes (RANS) solutions coupled with non-Darcian porous medium approach. The nonlinear contact model of brush seal was established using FEM with considerations of internal frictions (bristle to rotor, bristle to backing plate, and bristle to bristle) and aerodynamic loads on bristles. The numerical method involved iterations between CFD and FEM models to better evaluate the heat transfer behaviors of the brush seal with consideration of bristle deflections. The frictional heat generation was calculated from the product of bristle-rotor frictional force and sliding velocity. The bristle deflections and temperature distributions of the brush seal were predicted at various operational conditions using the iterative CFD and FEM brush seal model. The effects of pressure differential and rotational speed on the contact behavior, temperature distribution and bristle maximum temperature of brush seals were numerically investigated using the developed approach. The detailed pressure contours and streamline distributions of the brush seal were also illustrated.

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Section: Calibration Of Porosity and Resistance Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Qiu¹,

2013

Journal of Heat Transfer

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“…Chew and Guardino [13] established a three-dimensional model of a small area around the bristles tips, and analyzed the fiows and temperature distributions near the contact surface. Franceschini et al [14] put forward a three-dimensional model of four full and four half bristles, analyzed the flow among the bristles, and tbe numerical calculation and experimental measurement were verified.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation on Tip Forces and Temperature Distributions of the Brush Seal Coupled Aerodynamic Force

Huang¹,

Suo

et al. 2014

Journal of Engineering for Gas Turbines and Power

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Based on a type of three-dimensional slice model of a brush seal combined with the commercial CFD software FLUENT, the study calculated the leakage flow of the brush seal. The aerodynamic forces applied on upstream and downstream bristles are analyzed and reduced to a smaller amount of point forces for analysis convenience. The frictional coefficient between the bristle material Haynes 25 and rotor material ICrMMnMNi are tested. Tip forces including normal reaction and frictional forces caused by aerodynamic forces are quantitatively investigated under conditions with and without frictions using the torque balance principle and nonlinear beam theory (by ANSYS simulations), respectively. Torques, frictional heats, and the temperature distributions of the rotor and bristle pack are studied further. Details and characteristics of the flow and temperature distributions inside the bristle pack are presented. In the experiments, besides traditional tests, such as leakage and torque tests, an infrared camera is employed to capture temperature distributions at the interface of the rotor, bristle pack and nearby zones under various pressure differentials and rotation speeds. The three-dimensional slice model is firstly verified by calculating the leakages, torques and temperature distributions of the brush seal and confirmed via experimentation. The influence of various frictional coefficients and pressure differentials on tip forces, torque and temperature distributions are also examined.

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“…A close-up view of an aramid fiber brush seal is shown in Figure 1. Metallic brush seal design has been discussed at length in the literature [3][4][5][6][7][8][9][10][11][12][13][14][15][16], including investigations into bristle pack stiffness and heat generation at the bristle pack -rotor interface. Recent investigations have been published on similar design philosophies for aramid fiber brush seals, particularly aimed at compressor sealing applications in the Oil and Gas market.…”

Section: Introductionmentioning

confidence: 99%

Influence of Friction on the Blow-Down Behavior of an Aramid Fiber Brush Seal

Ruggiero

2012

Volume 4: Heat Transfer, Parts a and B

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Aramid fiber brush seals are ultra-low leakage, compliant sealing elements for turbomachinery applications. Such seals are applicable in the Aviation, Energy, and Oil and Gas markets as either air-air seals or air-oil seals. In the present study, the influence of friction present between the front plate and upstream side of the bristle pack of an aramid fiber brush seal is experimentally investigated. With the bristle pack fully exposed on the upstream side of the seal, the bristles are shown to blow down and create a better seal compared to the same brush seal with a front plate installed.of back-to-back tests, the influence of friction between the front plate and bristle pack is investigated and its impact on the sealing performance of the original poor seal design evaluated as described by Ruggiero et al. [17].

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Simulation of flow and heat transfer in the tip region of a brush seal

Cited by 29 publications

References 12 publications

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Numerical Investigations on the Heat Transfer Behavior of Brush Seals Using Combined Computational Fluid Dynamics and Finite Element Method

Theoretical and Experimental Investigation on Tip Forces and Temperature Distributions of the Brush Seal Coupled Aerodynamic Force

Influence of Friction on the Blow-Down Behavior of an Aramid Fiber Brush Seal

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