中文摘要：

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，刷丝在气流和后夹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。

英文摘要：

This study presents investigations on the frictional heat generation of brush seals with consideration of bristle deflections using a combined computational fluid dynamics （CFD） and finite element method （FEM） brush seal model. The results show that the bristles axially deflect under the pressure loads and backing plate supporting. An air gap is formed between the deflected bristles and backing plate. The frictional heat generation at bristle-rotor interface increases with increasing pressure differential and rotational speed. The maximum temperature of bristles increases to the peak value firstly and then decreases with increasing pressure differential. There exists the critical pressure differential makes the bristle maximum temperature reach to the peak value at each rotational speed. The critical pressure differential increases with increasing rotational speed. The bristle maximum temperature dramatically increases with increasing rotational speed.