J091034 数値解析を用いた吸込口側に障害物を有する小型軸流ファンの騒音特性の検討([J09103]流体関連の騒音と振動(3))

概要

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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 two kinds of obstacles in the suction side. Distance from the fan to the obstacles is 40mm. One obstacle was covering the entire fan called infinite-plate-model and another obstacle was covering half the fan called half-model. RMS of pressure fluctuations on suction side surface in infinite-plane-model and half model were compared. As a result, RMS of pressure fluctuations on suction side surface in both models becomes large at the center of tip by fluctuated tip vortex when blade passes through the motor stay. Low pressure area on the suction side surface in half model is enlarged by increased velocity around the fan blade. RMS of pressure fluctuations on suction side surface in half model becomes large near the hub.
一般社団法人日本機械学会の論文
2011-09-11