Effects of Aerodynamic Tabs onExhaust Noise from a Rectangular Plug Nozzle
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- ARAKI Mikiya
- 群馬大学工学部機械システム工学科
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- SANO Takayuki
- 群馬大学工学部機械システム工学科
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- KOJIMA Takayuki
- 宇宙航空研究開発機構総合技術研究本部
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- TAGUCHI Hideyuki
- 宇宙航空研究開発機構航空プログラムグループ
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- SHIGA Seiichi
- 群馬大学工学部機械システム工学科
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- OBOKATA Tomio
- 群馬大学工学部機械システム工学科
Bibliographic Information
- Other Title
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- 矩形プラグノズルからの排気騒音に及ぼす空力タブの効果
- クケイ プラグ ノズル カラノ ハイキ ソウオン ニ オヨボス クウリョク タブ ノ コウカ
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Abstract
Effects of aerodynamic tabs on exhaust noise from a rectangular plug nozzle were investigated experimentally. In JAXA (Japan Aerospace Explanation Agency), a pre-cooled turbojet engine for the 1st stage propulsion of a TSTO (Two stage to orbit) is planned. In the present study, a 1/100-scaled model of the rectangular plug nozzle for the pre-cooled turbojet engine is manufactured and the exhaust noise characteristics were investigated. Compressed air is injected through the rectangular plug nozzle into the atmosphere. The nozzle pressure ratio was set at 2.7, which corresponds to the take-off condition of the vehicle. Aerodynamic tabs were installed at the ramp end (Upper AT), the cowl end (Lower AT) and the sidewall end (Side AT). The SPL (Sound pressure level) was measured with a high-frequency microphone. Without AT, the sound spectrum has a broadband peak at which the SPL is around 105dB. For Lower and Side ATs, the OASPL (Overall SPL) of the exhaust noise decreases, especially around ramp end. At the maximum, the OASPL was reduced by 2.4dB with about 2% loss of the main jet total pressure at the cowl exit. It is shown that the aerodynamic tabs are effective in noise reduction in a rectangular plug nozzle.
Journal
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- JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
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JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 56 (651), 149-156, 2008
THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
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Details 詳細情報について
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- CRID
- 1390282679447642880
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- NII Article ID
- 10021153012
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- NII Book ID
- AA11307372
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- ISSN
- 24323691
- 13446460
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- NDL BIB ID
- 9481592
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed