典型参数对盘缘封严性能综合影响机制

为了掌握典型参数对盘缘封严燃气入侵的综合影响机制,采用数值方法研究并揭示了燃气入侵形式与封严间隙涡系结构的内在联系,在此基础上设计了一种内环型盘缘封严结构。结果表明:增加转速和增加主流流量都会导致封严效率降低,但是二者的作用却是相互羁绊的;与传统孔口模型相比,内环型盘缘封严结构能够有效将回流区涡限制在封严间隙内,利用羁绊效应拓宽了高封严效率区域的工况范围,提高了盘缘封严性能。

Integrated Influence Mechanism of Typical Parameterson Sealing Effectiveness of Rim Seal

In order to have a good understanding of the integrated influence mechanism of the typical parameters on sealing effectiveness of rim seal, the internal relationship between the ingestion form and the vortex structure in sealing gap was studied and revealed by numerical method. On this basis, an inner ring rim seal was designed. The results show that not only increasing rotation speed but also increasing mainstream mass flow will lead to the reduction of the sealing efficiency, but the role of the two is to fetter each other. Compared with conventional orifice model, the inner ring rim seal utilize fetter effect to widen the work condition range of the high sealing efficiency by restricting the recirculation vortex in the sealing gap. Thus the sealing effectiveness was improved.