Developments in brush seal analyses tools have been covering advanced flow and structural analyses since brush seals are applied at elevated pressure loads, temperatures, surface speeds, and transients. Brush seals have dynamic flow and structural behaviors that need to be investigated in detail in order to estimate final leakage output and service life. Bristles move, bend, and form a grift matrix depending on pressure load. The level of pressure load determines the tightness of the bristle pack, and thus, the leakage. In the computational fluid dynamics (CFD) analyses of this work, the bristle pack is treated as a porous medium. Based on brush seal test data, the flow resistance coefficients (FRC) for the porous bristle pack are calibrated as a function of pressure load. A circular seal is tested in a static test rig under various pressure loads at room temperature. The FRC calibration is based on test leakage and literature-based axial pressure distribution on the rotor surface and radial pressure distribution over the backing plate. The anisotropic FRC are treated as spatial dependent in axisymmetrical coordinates. The fence height region and the upper region of bristle pack have different FRC since the upper region is supported by backing plate, while bristles are free to move and bend at the fence height region. The FRC are found to be almost linearly dependent on the pressure load for investigated conditions. The blow-down is also calculated by incorporating test leakage and calibrated FRC.
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August 2018
Research-Article
Flow Resistance Coefficients of Porous Brush Seal as a Function of Pressure Load
Yahya Doğu,
Yahya Doğu
Mechanical Engineering Department,
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: yahya.dogu@hotmail.com
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: yahya.dogu@hotmail.com
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Koray Gezer,
Koray Gezer
Mechanical Engineering Department,
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: koraygezer90@gmail.com
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: koraygezer90@gmail.com
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Mustafa Kocagül
Mustafa Kocagül
Search for other works by this author on:
Yahya Doğu
Mechanical Engineering Department,
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: yahya.dogu@hotmail.com
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: yahya.dogu@hotmail.com
Mustafa C. Sertçakan
Koray Gezer
Mechanical Engineering Department,
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: koraygezer90@gmail.com
Kirikkale University,
Yahsihan 71450, Kirikkale, Turkey
e-mail: koraygezer90@gmail.com
Mustafa Kocagül
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 29, 2017; final manuscript received December 21, 2017; published online April 25, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Aug 2018, 140(8): 082504 (8 pages)
Published Online: April 25, 2018
Article history
Received:
November 29, 2017
Revised:
December 21, 2017
Citation
Doğu, Y., Sertçakan, M. C., Gezer, K., and Kocagül, M. (April 25, 2018). "Flow Resistance Coefficients of Porous Brush Seal as a Function of Pressure Load." ASME. J. Eng. Gas Turbines Power. August 2018; 140(8): 082504. https://doi.org/10.1115/1.4038994
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