篦齿封严流动及其对压气机静子性能的影响

为研究工程上广泛采用的3平齿型篦齿封严泄漏流动,以1台多级压气机第3级静子为例,利用数值模拟技术进行了计算分析.结果表明：篦齿封严间隙与泄漏流量成线性正比关系,但对静子流通能力和总压损失等的影响不是线性的;篦齿封严泄漏导致静子端壁区流动产生角区分离,并催生强的二次流动,是静子封严泄漏能够影响主流大范围流动的内在机制.为此提出将篦齿封严间隙控制在1％叶高左右的建议,以将篦齿封严泄漏对压气机静子的影响控制在可接受的范围之内.

Influence of Shrouded Stator

In order to investigate the application of three flat seal-teeth configuration in engineering, the calculation analysis was performed by numerical simulations on the basis of the third stator of a multi-stage compressor. The results show that the leakage flow and the seal clearance/span is linearly proportional relationship, but all of the stator flow capacity and total pressure loss and other effects that are not linear; the leakage flow leads to corner separation and strong secondary flow in the stator end wall, it is the flow mechanism inside that the main flow are influenced by the leakage flow. So we recommend that the seal clearance/span must be controlled less than 1% blade span to control the influence of leakage flow