Research on dynamic characteristics of brush seal based on porous media LTNE model

DOI:	10.11809/bqzbgcxb2023.11.026
Keywords:	brush seal; porous media model; LTNE model; brush bundle thickness; fence height; clearance; dynamic properties
Abstract:	The sealing dynamic characteristics are the core indicators to measure the stability of a seal rotor system. Geometric parameters of the brush seal are important parameters in affecting the dynamic characteristics. A numerical prediction model of the dynamic characteristics of the brush seal rotor is established, and the influence of the bristle pack thickness, the fence height and the gap between bristles and the rotor on the dynamic characteristics of a brush seal is numerically analyzed. The results show that with the increase of bristle pack and gap, the direct stiffness coefficient K decreases first and then increases as a whole. With the increase of fence height, K shows a trend of first increasing and then decreasing. The cross stiffness coefficient k increases first and then decreases with the increase of brush beam thickness and clearance. With the increase of fence height, k shows a trend of first decreasing and then increasing. The direct damping coefficient C changes around 0 with the increase of brush beam thickness and fence height, and has no obvious effect. With the increase of the gap, C decreases first and then increases as a whole; When the pressure ratio is 5, the cross damping coefficient c has been increasing with the increase of brush beam thickness. With the increase of the gap, the overall trend shows a trend of first increasing and then decreasing. This study provides a theoretical basis for improving the stability of brush sealed rotor system.
Issue:	Vol. 44 No. 11 (2023)
Published:	2023-11-28
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