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Effect of Coriolis and centrifugal forces on flow and heat transfer at high rotation number and high density ratio in non orthogonally internal cooling channel

查看全文 作　　者：Brahim Berrabah Miloud [1]Aminallah 高影响力作者 机构地区：[1]Department of Mechanical Engineering, Materials and Reactive Systems Laboratory, Faculty of Technology, Djillali Liabes University, Sidi Bel-Abbes 22000, Algeria高影响力机构 出　　处：《Chinese Journal of Aeronautics》索引2017年第30卷第1期,共19页高影响力期刊 摘　　要：Numerical predictions of three-dimensional flow and heat transfer are performed for a two-pass square channel with 45° staggered ribs in non-orthogonally mode-rotation using the second moment closure model. At Reynolds number of 25,000, the rotation numbers studied were 0,0.24, 0.35 and 1.00. The density ratios were 0.13, 0.23 and 0.50. The results show that at high buoyancy parameter and high rotation number with a low density ratio, the flow in the first passage is governed by the secondary flow induced by the rotation whereas the secondary flow induced by the skewed ribs was almost distorted. As a result the heat transfer rate is enhanced on both co-trailing and co-leading sides compared to low and medium rotation number. In contrast, for the second passage, the rotation slightly reduces the heat transfer rate on co-leading side at high rotation number with a low density ratio and degrades it significantly on both co-trailing and co-leading sides at high buoyancy parameter compared to the stationary, low and medium rotation numbers. The numerical results are in fair agreement with available experimental data in the bend region and the second passage, while in the first passage were overestimated at low and medium rotation numbers. 关 键 词：Blade cooling Computational Fluid Dynamic(CFD) Heat transfer High buoyancy parameter High rotation number
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