ターボ機械
Online ISSN : 1880-2338
Print ISSN : 0385-8839
ISSN-L : 0385-8839
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32 巻, 6 号
選択された号の論文の7件中1～7を表示しています
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論文
  • 軸流ファンの性能向上と騒音に関する実験的研究
    高津 恭, 西岡 卓宏, 永野 司
    原稿種別: その他
    専門分野: その他
    2004 年 32 巻 6 号 p. 343-350
    発行日: 2004年
    公開日: 2005/08/12
    DOIhttps://doi.org/10.11458/tsj.32.343
    ジャーナル フリー
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    An experimental research on axial flow fan was carried out in order to improve performance and reduce noise. Based on measurement of internal flow and CFD analysis, new casing figure and modified vortex design were proposed. New casing figure which had modified convergent rate at just upstream of 1st blade row achieved uniform incoming flow and lead to 2.7% efficiency up and 4 dB noise reduction. Modified vortex design improved blade element performance and lead to 2.6% efficiency up, but caused noise increase of 2.7 dB. Consequently, the efficiency was improved significantly and the noise was reduced by proposed new casing.
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  • ターボファンの低騒音化に関する研究
    (羽根前縁半径が騒音特性に及ぼす影響)
    川口 清司, 奥井 健一
    原稿種別: その他
    専門分野: その他
    2004 年 32 巻 6 号 p. 351-360
    発行日: 2004年
    公開日: 2005/08/12
    DOIhttps://doi.org/10.11458/tsj.32.351
    ジャーナル フリー
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    A turbo fan is generally used for compact type air conditioning equipments with narrow flow channels because of having high static pressure characteristics. However a turbo fan is desired for noise reduction because of the high pressure. This paper described the effects of leading edge radius of turbo fan blades on noise characteristics, and the effects of scroll shape and clearance between scroll and impeller on noise. In consequence we clarified that the pressure fluctuation at the leading edge due to the flow turbulence at inlet flow, and that the fan noise can be reduced by the impeller having large radius of leading edge of blades considerably.
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  • 高落差ポンプ水車の負荷遮断時における異常軸スラストの原因と対策
    黒川 淳一, 稲垣 守人, 田口 忠, 松井 純, 今村 博
    原稿種別: その他
    専門分野: その他
    2004 年 32 巻 6 号 p. 361-371
    発行日: 2004年
    公開日: 2005/08/12
    DOIhttps://doi.org/10.11458/tsj.32.361
    ジャーナル フリー
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    In the load rejection test of Kazunogawa Pumped-Storage P. S, an abnormal axial thrust occurred in a high-head reversible pump-turbine (412 MW and 714 m effective head). The rotating parts of 600 tons including a runner moved 4 mm upward in the axial direction. After taking several countermeasures, this machine is now operating without any problem, but the cause and the mechanism of abnormal axial thrust are not yet clear, though such a transient up-thrust has long been known. The present study is thus aimed to determine the reason why such abnormal axial thrust is caused at transient operation and how to reduce abnormal thrust. Here adopted is a theoretical approach which has been proved to give satisfactory results in predicting pump thrust. The calculated results under various operating conditions revealed the cause and detailed mechanism together with some effective countermeasures against abnormal axial thrust.
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