中文摘要：

本文通过数值计算模拟了高低齿型迷宫密封的内部流动结构,对比了不同压比和转速下密封性能的变化,同时通过实验验证了模拟结果。实验和计算结果表明,密封的泄漏量随压比的升高而变大,并在一定压比范围具有较好的线性相关性。当转子转速比较低时,转动对泄漏量影响不明显;当转速超过某个临界值的时候,泄漏量会随转速的增加而减少。这个临界值的大小与密封的结构、压比等因素有关。通过对密封内部流场结构的分析,提出了初步的优化方案,其中的核心思想是提高间隙节流的强度和动能耗散的速度。

英文摘要：

Simulating the inner flow structure of the staggered labyrinth seal, this paper compares the sealing performance changed with the different pressure ratio and rotational speed. And the calculation results are verified by stringent tests. The experimental and calculation results show that, the leakage of seal increases with the raise of pressure ratio, and in definite pressure range, the linearity is good. When rotational speed is low, the rotation has no effect on the leakage. However, when the speed exceeds a certain critical value, the leakage will decrease with increasing rotational speed[1]. This critical value is determined by the sealing structure, pressure ratio and other factors. Based on the analysis of the inner flow structure of the seal, a preliminary optimization of sealing structure is proposed. And the main concept of optimization is to improve the intensity of clearance throttle and the dissipation of kinetic energy.