軸流空冷ファンのP-Q曲線に関する電子機器筐体と流入口寸法による影響(<小特集>電子機器の熱・機械信頼性と機械工学)

概要

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This paper describes the effects of an enclosure and an inlet size of an electronic casing on the cooling fan performance. A performance of air-cooling fans is defined by their P-Q (pressure difference-flow rate) curves. Recent studies report that the P-Q curve of cooling fans depends on their operational environments. It is impossible for accurate CFD (Computational Fluid Dynamics) analyses to be performed on the thermal design of the electronic equipments, including fans. In this study, we measured the fan performance in the enclosure and explored the effects from the inlet size and an inlet shape while changing the number of revolutions of the test fan. Especially, a static pressure difference between forward and backward of the fan installed into the enclosure model was investigated and a total pressure difference which was calculated from a predicted dynamical pressure was also inspected. From experiments, we understood that a level of the fan performance change was decided by the size of the inlet area, and it was independent from the shape of the inlet and the working revolution of the fan.
社団法人日本機械学会の論文
2009-07-25