Numerical study on hysteresis characteristics of aero engine brush seals

DOI:	10.11809/bqzbgcxb2023.05.025
Keywords:	aero engine; brush seals; hysteresis characteristic; dynamic model; finite element method
Abstract:	In order to reveal the hysteresis law of a brush seal, according to its structural characteristics, this paper analyzes the relationship between the dynamic parameters of the brush seal system and the structural working parameters by using the finite element method. Based on the force analysis of the brush wire, a mass spring damping equivalent dynamic model of the brush seal system is established. The influence of the structural and working parameters on hysteresis amount, hysteresis rate and hysteresis time is studied, and the sensitivity of the structural parameters to the hysteresis characteristics of the brush seal is further analyzed. The results show that the hysteresis amount and hysteresis rate decrease with the increase of brush wire diameter, and increase with the increase of brush wire length, brush wire arrangement angle and rear baffle protection height. The rear baffle protection height has no effect on the lag time. The sensitivity of the structural parameters to the hysteresis is in an order of the rear baffle protection height, brush wire diameter, brush wire arrangement angle and brush wire length, from low to high. The research method of transforming the numerical model which is difficult to analyze into a research method of controllable numerical calculation can provide a new research idea for multi objective structural optimization of brush seals.
Issue:	Vol. 44 No. 5 (2023)
Published:	2023-05-28
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