コアンダ効果を受ける円柱に沿う壁面噴流の剥離の不安定性について(流体工学,流体機械)

概要

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This paper presents experimental and numerical results on the unstable flow along the surface of a circular cylinder in the Coanda effect. The unstable phenomenon depends on the nominal Reynolds number Re*=U_j√<(1/4)hD/v> and the nozzle height of the jet, h. In this paper, the changing phenomenon of two-dimensional jet direction is found numerically and the results are compared with the experimental ones. The numerical calculation is carried out by using the finite-difference method for the conditions of unstable phenomenon, that is, 1.5×10^4≦Re*≦2.5×10^4 and 0.100≦h/D≦0.200. Numerical results agree well with experimental results qualitatively. Also, it is found that the unstable phenomenon is sensitive to both Re* and h/D in the vicinity of h/D=0.10. Furthermore, a hysteresis phenomenon of jet direction by Re* was observed.
社団法人日本機械学会の論文
2004-03-25