新型翅片式减涡器减阻特性数值研究

为了降低压气机径向引气过程中的压力损失,在设计出新型翅片单元结构的基础上,研究了新型翅片单元结构对径向引气压力损失的影响规律,对不同转速、新型翅片结构的去旋系统开展了数值研究,得到了不同工况下压气机共转盘腔径向引气的流场结构及压力损失分布曲线。研究结构表明:新型翅片单元结构能够抑制盘腔内气流旋流比,降低引气压力损失;翅片单元通道宽度和高度均存在最佳值使得减涡器减阻效果较好,在优选结构翅片单元通道宽度L=0.78,通道高度R3=0.97的条件下,其减阻效果较简单盘腔模型提高86.5%。高低翅片结构能起到较好的减阻效果,随着单侧翅片高度的升高减阻效果逐渐增强,在本文结构下增加单侧翅片高度L1=0.3时减阻效果最优,且A侧或B侧翅片增加带来的减阻效益相同。一方面,最优高低翅片结构其减阻性能相比于简单盘腔模型、典型翅片式减涡器模型以及翅片单元通道宽度L=0.78,通道高度R3=0.97的结构模型分别提高87.5%,29%,7.8%;另一方面,最优高低翅片结构能够减轻翅片单元的质量,具有较高的工程应用价值。

Numerical Investigation on Resistance Reduction Characteristics of New Finned Vortex Reducer Device

In order to investigate the flow and heat transfer characteristics of slit inclined ribs and further improve the performance of traditional inclined ribs, the effects of five kinds of slits with different locations and angles on flow and heat transfer characteristics of 45° inclined ribs were studied by using numerical simulation method. The inlet Reynolds number calculated in this study is ranged from 2×10⁴ to 8×10⁴. A comparison and analysis with traditional solid ribs was conducted. The results show that the slits change the flow structure and heat transfer distribution of cooling channel. The slits decrease the resistance loss and enhanced heat transfer coefficient of cooling channel, but it increases the enhanced heat transfer coefficient of the rib surfaces. On the other hand, the location and the angle of the slits also have some effects on flow and heat transfer performance of cooling channel. The thermal performance factors of the slit inclined ribs increase by 12%~15%, compared with solid ribs.