高空舱篦齿封严密封特性研究和结构优化
Labyrinth Sealing Characteristics and Structural Optimization in High Altitude Cabin
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摘要: 利用CFD软件对高空舱前端封头篦齿封严内部流场进行数值模拟,得出了篦齿封严内部流场的压力、速度分布云图,表明篦齿封严是依靠齿隙中的流束收缩效应和密封齿腔中的热力学效应来实现密封的。通过分析齿腔深宽比及齿数对篦齿封严出口质量流率的影响,得到了针对高空舱篦齿封严的最优齿腔深宽比及齿数,经试验验证后证实,优化设计的高空舱篦齿封严满足固冲发动机地面直连式高空模拟试验的密封及推力测量需求。Abstract: The numerical simulation of labyrinth seal flow field was carried out by using CFD software. The distributive contours of pressure, velocity were acquired. The results show that the labyrinth seal can be achieved by the stream contraction effect in the backlash and thermodynamic effect in the sealed tooth cavity. By analyzing the impact of the tooth cavity aspect ratio and the teeth on mass flow rate of the labyrinth exit, the optimal ratio of the tooth cavity and the teeth were obtained. Through experimental verification, optimization of the labyrinth seal in high altitude cabin meet the ground direct-attached solid rocket ramjet altitude simulation test of seals and thrust measurement needs.