著者

中村 元 福江 高志 小泉 雄大 石塚 勝

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.76, no.768, pp.1184-1190, 2010-08-25 (Released:2017-06-09)

参考文献数

8

被引用文献数

4 2

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A compact air-cooling device often encounters high-density mounting environment, which may reduce a flow-rate of a cooling fan. In this work, the PQ characteristics of a cooling fan was investigated which varied by placing an obstacle in close proximity of a fan. Small axial-flow fans of 30-80mm in side length and small centrifugal fans of 35-52mm in side length were tested here. As a result, it was found that the maximum flow rate for the free air-flow begin to decrease when the opening area of the gap-flow between the fan and the obstacle becomes smaller than twice the fan flow area, and decreases suddenly if it becomes smaller than the fan flow area. This relation was almost independent of type and size of a fan, rotation speed of impeller, and shape and position of an obstacle.

著者

福田 哲士 増田 幸男 福江 高志 畠山 友行 石塚 勝 小泉 雄大

出版者

社団法人 日本伝熱学会

雑誌

日本伝熱学会論文集 (ISSN:09189963)

巻号頁・発行日

vol.30, no.1, pp.1-12, 2022 (Released:2022-02-22)

参考文献数

21

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This study describes the 40 mm scale small axial fan P - Q curves mounted in high-density packaging electronic equipment. An accurate prediction of supply flow rate by fans strongly affects the reliability of the cooling design. However, in high-density packaging electronic equipment, the fan performance is affected by the mounting components around the fans, and the accurate prediction of the supply flow rate becomes difficult. In this paper, by a CFD analysis, visualization around the fan impellers with the obstructions was conducted. By comparing the predicted result of the P- Q curves by the proposed analytical method and experiment, the proposed analysis's effectiveness was evaluated.

著者

福江 高志 義基 貴史 石塚 勝 中川 慎二

出版者

社団法人 日本伝熱学会

雑誌

日本伝熱学会論文集 (ISSN:09189963)

巻号頁・発行日

vol.16, no.4, pp.147-156, 2008 (Released:2009-04-23)

参考文献数

14

被引用文献数

2

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This paper describes the effects of frame and inlet sizes of an electronic casing on the cooling fan performance. The performance of air-cooling fans is defined by their P-Q characteristics. Recent studies report that P-Q curves of cooling fans depend considerably on their operational environments. It is impossible for accurate CFD (Computational Fluid Dynamics) analyses to be performed on the thermal design of electronic equipments, including fans. In this study, we measured a fan performance in some frames and explored effects of environment for their P-Q characteristics, especially effects from area of frame and cooling air inlet sizes. From experimental results, it was found that the fan P-Q characteristics, especially flow rate were affected strongly by inlet sizes.

著者

衛 飛 廣瀬 宏一 藤田 尚毅 福江 高志

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会東北支部秋季講演会講演論文集

巻号頁・発行日

vol.2013, pp.79-80, 2013