| Budget Amount *help |
¥23,400,000 (Direct Cost: ¥18,000,000、Indirect Cost: ¥5,400,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Fiscal Year 2016: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Outline of Final Research Achievements |
In this study, we aimed to evaluate and understand thermoacoustic phenomena by measuring entropy production ΔS. First, we measured the thermal efficiency and ΔS for a thermoacoustic engine while changing the ratio of the channel radius r to the thermal penetration depth δ. As a result, r/δ at the maximum point of thermal efficiency and r/δ at the minimum point of ΔS approximately matched in the experimental range.Moreover, we measured ΔS of the thermoacoustic self-oscillation during forced synchronization/asynchronization. As a result, ΔS was significantly reduced in the synchronous state in the region where hysteresis occurred in the forced synchronization/asynchronization. The results above show that the measurement of ΔS is effective in order to understand the thermoacoustic phenomena clearly.
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