蜂窝面迷宫密封内流动和总温升特性的研究  

Study on Flow and Total Temperature Increase of Honeycomb Labyrinth Seals

作　　者：晏鑫[1] 李军[1] 宋立明[1] 丰镇平[1] 

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《西安交通大学学报》2008年第7期823-827,869,共6页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50506023)

摘　　要：研究了典型燃气轮机蜂窝面迷宫密封内的流动和总温升特性,并与光滑面迷宫密封进行了比较.采用标准k-ε紊流模型数值求解了三维Reynolds-Averaged Navier-Stokes(RANS)方程,计算了2种流量、不同转速时蜂窝面和光滑面迷宫密封的内流场以及间隙热系数.计算得到的蜂窝面和光滑面迷宫密封的间隙热系数与实验数据吻合良好,验证了数值方法的可靠性.研究结果表明:在相同转速、径向间隙和流量条件下,蜂窝面迷宫密封的总温升高于光滑面迷宫密封,即蜂窝面迷宫密封的间隙热系数高于光滑面迷宫密封,表明蜂窝面的阻尼作用提高了间隙热系数.对于蜂窝面和光滑面迷宫密封,其总温升和间隙热系数随转速的升高而增大,随流量的增大而减小.对于蜂窝面迷宫密封,在相同转速条件下,泄漏流量的增大使得子午面上速度增大,但密封内的泄漏流动形态基本相似,光滑面迷宫密封内的泄漏流动形态也具有类似特性.The leakage flow and total temperature increase characteristics of a honeycomb labyrinth seal used in a typical gas turbine were numerically investigated and compared with a smooth labyrinth seal. The Reynolds-Averaged Navier-Stokes（RANS） equations and standard k-ε turbulent model were adopted. The calculation of the leakage flow field and total temperature increase of two kinds of labyrinth seals with honeycomb stator and smooth stator were conducted at two kinds of leakage flow rates and different rotational speeds. The computed windage heating numbers of the honeycomb and smooth labyrinth seals agree well with the experimental data. The results show that the windage heating number of the honeycomb labyrinth seal is higher than that of the smooth one at the same leakage flow rate and rotational speed. The damping characteristics of the honeycomb cell enhance the windage heating number. The windage heating number increases with the increase of rotational speed and decreases with the increase of the leakage flow rate for the honeycomb and smooth labyrinth seals. For both the honeycomb labyrinth seal and smooth labyrinth seal, the increase of the leakage flow rate increases the meridional velocity at the same rotational speed, but the leakage flow fields of different leakage flow rate exhibit the similar flow pattern.

关 键 词：蜂窝面迷宫密封 泄漏流动 间隙热系数 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]