Amplification of thermoacoustic oscillations by locally connected large resonators
| Project/Area Number |
18K03938
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 19010:Fluid engineering-related
|
|---|
| Research Institution | Fukui University of Technology |
|---|
Principal Investigator |
SHIMIZU Dai 福井工業大学, 工学部, 教授 (40448048)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
杉本 信正 関西大学, 先端科学技術推進機構, 研究員 (20116049)
|
|---|
| Project Period (FY) |
2018-04-01 – 2021-03-31
|
| Project Status |
Completed (Fiscal Year 2020)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | 熱音響自励振動 / 大振幅 / ヘルムホルツ共鳴器 / 局所接続 / ２次振動モード / エネルギーカスケード / 曲率 / 対称性 / 2次高調波 / 高次振動モード / 熱機関 |
|---|
| Outline of Final Research Achievements |
Experiments are performed to demonstrate amplifications of thermoacoustic oscillations in air-filled tubes by connecting large Helmholtz resonators locally. In comparison with the case without the resonators, it is found that, not only standing waves excited in straight tubes but also traveling waves excited in looped tubes, thermoacoustic oscillations are amplified by connecting Helmholtz resonators locally. Unlike the cases connecting an array of Helmholtz resonators, the generation of particular harmonic oscillations, especially the second-harmonic oscillations, is suppressed significantly so that the energy cascade to higher harmonic oscillations is suppressed fundamentally by connecting Helmholtz resonators locally.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究では，大型の共鳴器を局所的に接続することにより，特定の振動モード，とりわけ2次振動モードの発生を顕著に抑制することでエネルギーカスケードを根本から断ち切り，熱音響自励振動の大振幅化が可能であることを明らかにした．この方法は，スタックの改良や多段化等により大振幅化を達成してきた既存手法との共存が可能であり，更なる大振幅化が期待される．また，共鳴器列の場合とは異なり，装置の一部分に対してのみ共鳴器を接続可能とする構造を付加するだけで良いことから，既存手法との親和性が高く，応用範囲が非常に広いことが期待される．
|
Report
(4 results)
Research Products
(9 results)
