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基于多孔介质模型,采用计算流体力学软件Fluent对3种压比条件下不同刷束厚度、径向间隙及槽深的刷式汽封泄漏流动特性进行数值模拟,对得到的数据结合软件Origin、Tecplot进行整理分析,结果表明:刷式汽封泄漏量与刷束厚度成反比例关系,同时随着刷束厚度的增大,压比变化对泄漏量的影响基本保持不变,以0.70 mm为分界点,下降幅度有所减小;刷式汽封泄漏量与径向间隙成正比例关系,且随着径向间隙的增大,压比变化对泄漏量的影响越来越明显,压降区域范围变大,流线偏转角增大,发生偏转位置沿轴向向上游移动;槽深对低滞后刷式汽封泄漏流动影响不大,工程实际中减压槽深度的确定仅需考虑刷丝与背板间的摩擦力、刷丝在工作时的弯曲度等。
Based on the porous media model, the computational fluid dynamics software Fluent was used to simulate the leakage flow characteristics of brush seal with different brush bundle thickness, radial clearance and groove depth under the three pressure conditions. The data obtained from the software Origin, Tecplot The results show that the leakage of brush seal is inversely proportional to the brush bundle thickness, and the effect of pressure ratio change on the leakage remains the same with the increase of brush bundle thickness, with 0.70 mm as the cut-off point , The decrease rate of the decrease is smaller. The leakage of brush seal is directly proportional to the radial clearance. With the increase of radial clearance, the influence of the pressure ratio on the leakage is more obvious. The range of pressure drop Large, streamline deflection angle increases, the deflection occurs along the axial direction of the upstream shift; groove depth on the low lag brush seal leakage flow is not significant, engineering practice, the depth of vacuum tank to determine only consider the brush wire and back The friction between the plates, the bending of the wire during work, etc.