2019 Fiscal Year Final Research Report
Entropy generation and thermal efficiency of thermoacoustic engine
| Project/Area Number |
16H06070
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Tokai University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Keywords | 熱音響現象 / エントロピー生成 / 熱効率 / 同期現象 / エネルギー変換 / 非線形振動 |
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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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| Free Research Field |
熱音響工学
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| Academic Significance and Societal Importance of the Research Achievements |
熱音響現象におけるエントロピー生成の測定を行うことにより，熱音響機関の熱効率の低減に寄与する要素の検討や，熱音響自励振動を対象とした外力による強制同期/非同期の分岐の検討が可能となった．本研究では熱音響機関の熱効率や，熱音響自励振動における強制同期に着目したが，多様な非線形ダイナミクスにおいてもエントロピー生成の測定を行うことにより，従来までの力学的な側面からの理解に加え，熱力学という別の側面から現象の分析・理解ができる可能性がある．
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