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为了改善传统交错式迷宫密封容易产生气流激振并导致转子失稳,对密封结构进行改造,提出了一种可以平衡气流激振力的T型交错式迷宫密封。考虑转子振动,三种转速(18,24与30kr/min)以及三种压差(0.2,0.3与0.4MPa),对直通式、交错式迷宫密封以及T型交错式迷宫密封进行数值计算。结果表明,在相同齿顶间隙的条件下,交错式迷宫密封的泄漏量较T型交错式迷宫密封减小约8%较直通式迷宫密封减小约32%。通过对比三种密封流场所产生的气体作用力之间的差异,得出T型交错式迷宫密封的优势在于扩大了Lomakin效应,增强了交错式迷宫密封的稳定性,同时实现了高封严效率与较高稳定性。
In order to improve the traditional staggered labyrinth seal is easy to produce air-induced vibration and rotor instability, the sealing structure is modified, and a T-type interleaved labyrinth seal that can balance the airflow excitation force is proposed. Considering rotor vibration, three rotational speeds (18, 24 and 30kr / min) and three pressure differentials (0.2, 0.3 and 0.4MPa), the straight-through, staggered labyrinth and T-labyrinth labyrinth seals were numerically calculated. The results show that the leakage of staggered labyrinth seal is about 8% lower than that of the T - type staggered labyrinth seal and about 32% lower than the straight labyrinth seal under the same addendum clearance. By comparing the differences between the gas forces generated by the three seal flow fields, it is concluded that the T-type interleaved labyrinth seal has the advantage of expanding the Lomakin effect and enhancing the stability of the interleaved labyrinth seal while achieving a high seal efficiency With higher stability.