Jet Noise Assessment of Full-Scale Supersonic Engines Using 1MHz Optical Microphone and Low-Density-Gas Jets
| Project/Area Number |
16H04584
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Aerospace engineering
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| Research Institution | Gunma University |
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Principal Investigator |
Araki Mikiya 群馬大学, 大学院理工学府, 教授 (70344926)
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| Co-Investigator(Kenkyū-buntansha) |
志賀 聖一 群馬大学, 大学院理工学府, 教授 (00154188)
GONZALEZ・P JUAN 群馬大学, 大学院理工学府, 助教 (30720362)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2016: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Keywords | 超音速ジェットエンジン / ジェット騒音 / 光学マイクロフォン / 低密度ガスジェット / 実機騒音推算 |
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| Outline of Final Research Achievements |
Supersonic jet engines operate at a high-velocity (order of 1000m/s) and high-temperature (order of 2000K) condition, and their noise reduction devices should be evaluated using a full-scale engine. It could bring a significant benefit if this could be done using ‘unheated’ and ‘1% miniature-sized’ nozzles. The jet acoustics could be reproduced using a ‘low-density gas’ instead of a ‘high-temperature burnt gas’. The jet noise frequency from the miniature nozzle becomes 100 time as high as that for a full-scale engine. By using the newly developed ultra-high frequency optical microphone, the acoustic measurement could be done that covers the human audible range even at the corrected frequency.
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| Academic Significance and Societal Importance of the Research Achievements |
航空宇宙開発に要するコストを削減するための研究である．防爆・保安設備の整う巨大設備と，100名/日オーダの人員（危険かつ高価）を必要とする実機エンジン試験を，非加熱（安全）のミニチュアノズル（安価）で行うという試みである．音響計測に限定されるものではあるが，実機試験と同等の内容の試験を，数名の試験人員で数週間で行うことができるという成果を得た．騒音低減デバイス開発に弾みをつける成果であると考えている．
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Report
(4 results)
Research Products
(2 results)
