迷宫-蜂窝混合型密封静态稳定性与泄漏特性研究

Leakage Performance and Static Stability of Hybrid Labyrinth-Honeycomb Seals

建立迷宫-蜂窝混合型密封三维数值分析模型,研究密封在阻塞/非阻塞流动状态及不同偏心率下静态稳定性与泄漏特性,并与传统迷宫密封进行对比分析.结果表明:两种不同结构型式的密封泄漏量均随偏心率的增大而增加,但迷宫-蜂窝混合型密封相较于传统迷宫密封有更好的封严性能.在阻塞与非阻塞状态下,两种密封均表现为负的静态刚度系数,系统易产生静态失稳现象.与传统迷宫密封相比,迷宫-蜂窝混合型密封静态刚度系数绝对值较小,稳定性较高.

A three-dimensional numerical model of the hybrid labyrinth-honeycomb seal was established.The static stability and leakage characteristics of the hybrid labyrinth-honeycomb seal were investigated and compared to the traditional labyrinth seal in the choked/unchoked flow condition and different eccentricity.Results showed that the leakage flow rate of the two kinds of seals increased with the increasing eccentricity,while the hybrid labyrinthhoneycomb seal showed better leakage performance than the traditional labyrinth seal.The fluid-induced force and static stiffness coefficient of two kinds of seals in the choked and unchoked condition were negative,which was prone to the static instability of the system.Compared to the traditional labyrinth seal,the absolute value of the static stiffness coefficient of the hybrid labyrinth-honeycomb seal was smaller,and hybrid labyrinth-honeycomb seal possessed a relatively better stability.