可視化によるクロスフローファン内部流れの研究 : 第2報,偏心渦の強さのバランスの機構

概要

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An eccentric vortex plays an important role in cross-flow fans. Experiments were carried out to study the balance of vorticity supply and diffusion in the eccentric vortex. From the consideration of the measured distribution of vorticity, a diffusion model for the eccentric vortex is proposed. In this model, vorticity is supplied to the eccentric vortex region by the circumferential change of impeller blade circulation and it is diffused to the through flow region with an effective viscosity. The effective viscocity, which is 300 times as large as the molecular viscosity of the fluid, is almost independent of the flow rate. Quantitative discussions are presented as to the energy transfer from the impeller to the fluids in the recirculating and through , flow regions, and as to the work transfer between these regions owing to the shear stress. Numerical simulation with the effect of vorticity diffusion, the random walk model, were carried out by using a value close to that of the measured effective viscocity. Calculated flow fields are in good agreement with experimental results.
一般社団法人日本機械学会の論文
1994-12-25