ABSTRACT
Keywords: brush seal; leakage; torque; temperature
1 INTRODUCTION
The brush seal consists mainly of a front plate, backing plate and closely spaced bristles clamped between the two parts. The bristle roots are welded together, and bristles are “blown down” by a high-pressure gas upstream and pushed into contact with the rotor surface (or a small radial clearance), which is helpful to maintain bristle-rotor contact and eliminate seal clearance [1]. Leakage still exists through the inter-bristle gaps or the radial clearance between the bristle pack and rotor.
