Labyrinth Sealing Characteristics and Structural Optimization in High Altitude Cabin

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.