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采用计算流体动力学与有限元分析相结合的方法,数值研究了压差和干涉量对刷式密封传热特性的影响规律。刷式密封的温度分布是通过求解基于Non-Darcian多孔介质模型的Reynolds-Avergaed Navier-Stokes(RANS)方程获得。刷丝与转轴的摩擦热量是通过摩擦系数、法向接触力和接触速度计算得到。刷丝与转轴接触力是通过对刷式密封非线性接触模型进行有限元分析计算获得。研究结果表明,在干涉量一定时,刷丝与转轴法向接触力随压差增大呈线性增加,刷丝的最高温度随压差增大而显著升高,但最高温度的上升趋势随压差增大而减缓;在压差一定时,刷丝与转轴法向接触力随着干涉量增大而略微增大,最高温度随干涉量增加而小幅上升。
The influence of pressure difference and interference on the heat transfer characteristics of brush seal was studied numerically by means of computational fluid dynamics and finite element analysis. The temperature distribution of the brush seal was obtained by solving the Reynolds-Avergaed Navier-Stokes (RANS) equation based on the Non-Darcian porous media model. The frictional heat between the brush wire and the shaft is calculated by the friction coefficient, the normal contact force and the contact speed. Brush wire and shaft contact force through the brushless contact nonlinear contact model obtained by finite element analysis. The results show that when the interference is constant, the contact force between brush wire and shaft increases linearly with the increase of differential pressure. The maximum temperature of brush wire increases with the increase of differential pressure, but the upward trend of maximum temperature increases with pressure The difference increases and slows down; when the pressure difference is constant, the normal contact force between brush wire and shaft slightly increases with the increase of the interference, and the maximum temperature increases slightly with the increase of the interference.