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A fluxional force-generated sound reducing device

机译：通量力产生的消声装置

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摘要

Fine fibers 5 are planted on a surface of an object 1 moving relative to a fluid or on an inside surface of a pipe or duct 2 conveying a fluid therethrough at a portion which comes into contact with the fluid. 1) When a turbulent flow from the upstream side collides with the surface covered with the fibers, the fibers 5 function as a cushion so as to soften the vortexes and reduce pressure fluctuations. 2) The boundary layer near the surface may easily be transformed into a turbulent flow by the fine fibers 5 so that the flow becomes less spatially correlated. Further, when any generated turbulent flow passes by, pressure fluctuations can be reduced by the fibers. 3) Each fiber is very fine and soft, and therefore does not exerts any reaction forces (or any pressure fluctuations) against the flow. As a result, the sound arising when the flow collides with the fibers is extremely softened.

机译：细纤维5被种植在相对于流体运动的物体1的表面上或在与流体接触的部分处输送流体通过的管道或导管2的内表面上。 1）当来自上游侧的湍流与覆盖有纤维的表面碰撞时，纤维5用作缓冲垫，以软化涡流并减小压力波动。 2）靠近表面的边界层可以容易地被细纤维5转变成湍流，从而使该流在空间上变得不那么相关。此外，当任何产生的湍流通过时，纤维可以减小压力波动。 3）每根纤维都非常细且柔软，因此不会对流施加任何反作用力（或任何压力波动）。结果，当流体与纤维碰撞时产生的声音被非常柔和。

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公开/公告号EP0659641A1

专利类型
公开/公告日1995-06-28

原文格式PDF
申请/专利权人 MITSUBISHI JUKOGYO KABUSHIKI KAISHA;
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申请/专利号EP19940119623
发明设计人 NISHIMURA MASAHARUC/O TAKASAGO RES. DEV. CTR.;KUDO TOSHIFUMIC/O TAKASAGO RES. DEV. CENTER;HIROTA KAZUOC/O TAKASAGO RES. DEV. CENTER;HIGASHIDA AKIOC/O KOBE SHIPYARD MACHINERY W.;NAKAGAWA KEIZOC/O KOBE SHIPYARD MACHINERY W.;YAMAGUCHI TSUTOMUC/O KOBE SHIPYARD MACHINERY;NISHIOKA MICHIO;
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申请日1994-12-12
分类号B64C21/10;F15D1/06;F15D1/12;F04D29/22;F04D29/68;F01N1/24;F16L55/033;
国家 EP
入库时间 2022-08-22 04:12:46

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