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http://dx.doi.org/10.9725/kts.2019.35.2.99

Experimental Study on the Wear Effects of a Brush Seal in DN 2.5million in a 250℃ High - temperature Steam Environment  

Ha, YunSeok (University of Science and Technology Department of Energy Environment Convergence)
Ha, TaeWoong (Gachon University Department of Mechanical Engineering)
Lee, YoungBok (Korea Institute of Science and Technology of National Foundation Technology Research Center)
Publication Information
Tribology and Lubricants / v.35, no.2, 2019 , pp. 99-105 More about this Journal
Abstract
This study presents an experimental investigation of the wear and oxidation of the bristles of a brush seal in a super-heated steam environment. We construct a model reflecting normal force and radial interference to predict the amount of wear. To monitor the volume loss of the bristle induced by the swirl phenomenon of the rotor, we measure the clearance between the rotor and the brush seal by using a non-contact 3-D device. We calculate the area by using the area-wise measurement method. Considering the obvious brush seal wear variables, we use two disks with different roughness($Ra=0.1{\mu}m$ and $100{\mu}m$) to determine the effect of roughness on wear. Considering an actual steam turbine, we utilize a steam generator and super-heater to generate a working fluid (0.95MPa, 523.15K) that has high kinetic energy. We observe the abrasion of the bristles in the hot steam environment through a scanning electron microscope image. This study also conducted energy dispersive X-ray (EDX) analysis for a qualitative evaluation of local chemistry. The results indicate that the wear and elimination of bristles occur on the disk with high roughness, and the weight increases due to oxidation. Furthermore these results, reveal that the bristle oxidation is accelerated more under super-heated steam conditions than under conditions without steam.
Keywords
brush seal; wear; Bristle; Surface roughness; super-heated steam;
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Times Cited By KSCI : 1  (Citation Analysis)
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