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采用计算流体动力学与有限元分析的方法,数值研究了在考虑刷丝变形时刷式密封的摩擦热效应.结果表明,刷丝在气流和后必板的共同作用下会发生轴向弯曲.末排刷丝与后夹板之间会形成一个间隙;刷丝束与转轴的摩擦产热随着压差和转速的增大而增大;刷丝的最高温度随压差增大呈现先增大后减小的趋势,每种转速下都存在一个临界压差使最高温度达到最大值,临界压差会随着转速升高而增大;最高温度会随着转速的升高而显著增大.
The frictional heat effect of the brush seal was numerically investigated by computational fluid dynamics (CFD) and finite element analysis (FEM). The results show that axial bending of the brush filament occurs under the influence of the airflow and the post-plate. A gap is formed between the brush wire and the rear clamping plate; the frictional heat transfer between the brush filament and the rotary shaft increases with the increase of the pressure difference and the rotational speed; the maximum temperature of the brush wire increases first and then increases with the increase of the differential pressure There is a critical pressure drop at each speed that maximizes the maximum temperature. The critical pressure increases with increasing speed. The maximum temperature increases significantly with increasing speed.