带导流片的径向预旋系统流动结构数值研究

Numerical Investigation on Flow Structure of Radial Pre-swirl System with Deflector Vanes

为探索提高预旋温降的途径,在光滑共转腔径向预旋结构的基础上,设计了一种共转腔内带导流片的径向预旋结构。对这2种模型开展数值模拟,得到预旋系统内部流场。通过研究得到以下结论:在径向预旋结构中设置导流片可以提高预旋温降,对提高发动机性能有重要意义;导流片的结构尺寸对温降有较大影响;导流片模型和光滑共转腔模型流场的主要区别在共转腔内,对导流片上游的影响范围有限;导流片将流经导流片间的流体整流到旋流比接近1,其间周向相对速度较小;哥氏力对导流片间的流动结构有重要影响。

To improve temperature reduction through pre-swirl system, a radial pre-swirl system with deflector vanes in co-rotating cavity was designed based on typical radial pre-swirl system. Numerical simulation was carried out on both models, and flow field was obtained. Conclusions have been sum- marized as follows ： installation of deflector vanes in co-rotating cavity does improve temperature reduc- tion, which is significant for aero-engine＇ s improvement. There is important influence on temperature reduction for the structure of deflector vanes. Differences between two models show that there is little effect on flow field in upper stream, swirl ratio of the fluid flow across these vanes is adjusted ap- proach 1, while the relative tangential velocity is small in the co-rotating cavity, and Coriolis forces affect flow structure among the vanes significantly.