1015 流入乱れを有する小型軸流ファンにおける流入角変化が及ぼす翼面圧力変動への影響

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  • 1015 Effect on the blade surface pressure fluctuations by inflow angle changes in the small axial flow fan with inflow turbulence

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Numerical simulations were conducted by using LES (Large Eddy Simulation) with DSM (Dynamic Smagorinsky Model) about the axial flow small fan for cooling electronic devices. In this study, the tested fan has grid for turbulence located in the suction side. Using three type of grid for turbulence were used for study. First has diameter of 3mm and pitch of 15mm(GT3), second has diameter of 4mm and pitch of 20mm(GT4),third has diameter of 1mm and pitch of 5mm(GT1). The flow pattern around the fan blade and RMS of pressure fluctuation on the fan blade surfaces were compared under the three turbulence conditions and no turbulence condition. As a result, it is shown that noise is increased by the grid for turbulence. These cause are considered large pressure fluctuations which were revealed by numerical analysis. We found that pressure fluctuation of leading edge is caused by incidence fluctuation.

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