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Title:
NOISE REDUCING DEVICE, AIRCRAFT, AND NOISE REDUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/163379
Kind Code:
A1
Abstract:
[Problem] To provide a noise reducing device, an aircraft, and a noise reduction method capable of increasing an amount of noise reduction. [Solution] A noise reducing device 1 is disposed facing a flow of a fluid, and includes a porous plate 2 having a curved region 5 which is curved toward the upstream side of the fluid flow. The curved region 5 is provided at an end portion 6 of the porous plate 2, and has a concave radius shape on the upstream side of the fluid flow. The porous plate 2 typically causes the direction of the fluid flow to be deflected toward the outside from the center of the porous plate 2, but by including the curved region 5, the deflected fluid more readily passes through the porous plate 2. A shear layer in the fluid flow thus becomes weaker, noise induced by a vortex is reduced, and the amount of noise reduction can be increased.

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Inventors:
HIRAI, Tohru (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
MURAYAMA, Mitsuhiro (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
YAMAMOTO, Kazuomi (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
ITO, Yasushi (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
TANAKA, Kentaro (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
TAKAISHI, Takehisa (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
YOKOKAWA, Yuzuru (7-44-1 Jindaiji Higashi-machi, Chofu-sh, Tokyo 22, 〒1828522, JP)
Application Number:
JP2019/002065
Publication Date:
August 29, 2019
Filing Date:
January 23, 2019
Export Citation:
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Assignee:
JAPAN AEROSPACE EXPLORATION AGENCY (7-44-1, Jindaiji Higashi-machi Chofu-sh, Tokyo 22, 〒1828522, JP)
International Classes:
F15D1/00; B64C25/04
Domestic Patent References:
WO2004039671A12004-05-13
Foreign References:
JP2010522110A2010-07-01
JP2014514502A2014-06-19
JP2003219506A2003-07-31
Attorney, Agent or Firm:
OMORI, Junichi (2nd Floor U&M Akasaka Bldg, 7-5-47 Akasaka Minato-k, Tokyo 52, 〒1070052, JP)
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