長方形断面曲がり管内乱流の研究 : 第5報,流入速度分布と助走区間の流れ

概要

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Developing turbulent flows in the entry region of a curved rectangular duct are studied experimentally for both inlet conditions of uniform flow and fully developed flow. It is found that the developing flow region can be divided into the following three regions in spite of the difference between two inlet flow profiles : (1) The first region, the duct turning angle φ=15〜45°, in which the secondary flow exists only near the end wall, so that the main flow has little effect of the secondary flow on its velocity profile ; (2) The second region, φ=45〜105°, in which the cross-section of the duct is filled with strong secondary flow which affects the main flow extensively ; (3) The third region, φ=105〜195°, in which both the main and secondary flow are relaxed gradually to be a fully developed equilibrium state.
社団法人日本機械学会の論文
1988-06-25