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research-article

FLOW RESISTANCE COEFFICIENTS OF POROUS BRUSH SEAL AS A FUNCTION OF PRESSURE LOAD

[+] Author and Article Information
Yahya Dogu

Kirikkale University, Mechanical Engineering Dept., Yahsihan, Kirikkale, Turkey
yahya.dogu@hotmail.com

Mustafa C. Sertçakan

TUSAS Engine Industries, Inc. (TEI), Eskisehir, Turkey
mustafacem.sertcakan@tei.com.tr

Koray Gezer

Kirikkale University, Mechanical Engineering Dept., Yahsihan, Kirikkale, Turkey
koraygezer90@gmail.com

Mustafa Kocagul

TUSAS Engine Industries, Inc. (TEI), Eskisehir, Turkey
mustafa.kocagul@tei.com.tr

1Corresponding author.

ASME doi:10.1115/1.4038994 History: Received November 29, 2017; Revised December 21, 2017

Abstract

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 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 axi-symmetrical 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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