Drag reduction performance of tube-baffle composite vortex reducer
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摘要: 为了探索管-隔板复合式减涡器结构对共转盘腔径向内流流阻特性的影响规律,对不同转速、管-隔板复合结构下的去旋系统展开了数值研究,得到了不同工况下径向内流共转盘腔的流场结构、总压损失以及沿程总压损失分布曲线。研究结果表明:相对于基础管式减涡器,管-隔板复合式减涡器可以明显降低盘腔内的总压损失。管式减涡器盘腔上游安装隔板的减阻效果要优于盘腔下游安装隔板的减阻效果,且上游隔板和下游隔板存在最佳无量纲长度为0118和0065,与基础模型相比,最佳减阻效果分别提高17%和5%。在最佳隔板长度下,管式减涡器上、下游同时安装隔板的减阻效果最好,相比于基础模型,减阻性能提高19%。
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关键词:
- 管-隔板复合式减涡器 /
- 流阻特性 /
- 旋流比 /
- 流场结构 /
- 沿程总压损失
Abstract: To research the effects of tube-baffle composite vortex reducer on drag reduction performance of radial internal flow in co-rotating disc cavity, numerical simulation was carried out to calculate the de-rotating system with varied structure of tube-baffle composite vortex reducer under different rotating speeds. The flow structure, total pressure loss and distribution curve of total pressure loss along the way under varied conditions were obtained. The results showed that the total pressure loss in the disk cavity of the tube-baffle composite vortex reducer can be obviously reduced with respect to the basic tube vortex reducer. The drag reduction effect of the upstream installation partition of the tube vortex reducer was better than that of the downstream installation of the disc cavity. There existed optimal dimensionless baffle length of 0118 and 0065 for upstream and downstream baffles. Compared with the basic model, the optimal drag reduction effect increased by 17% and 5%, respectively. And at the optimum baffle length, the drag reduction effect of the upstream and downstream baffles installed at the same time was 19% higher than the basic model. -
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