| 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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| 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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