Development of wavelet-based conditional sampling and averaging method and the application to the noise source identification of supersonic jet broadband noise

• Project/Area Number: 18H01621
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: The University of Tokyo
• Principal Investigator: Teramoto Susumu 東京大学, 大学院工学系研究科(工学部), 教授 (30300700)
• Co-Investigator(Kenkyū-buntansha): 岡本 光司 東京大学, 大学院新領域創成科学研究科, 准教授 (70376507)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
• Keywords: 空力音響 / 超音速ジェット / 条件付き抽出 / ロケット / ロケット音響 / 衝突ジェット

Outline of Final Research Achievements

The mechanism of the noise generation from high-speed engine exhausts was studied. Wavelet-based conditional sampling and averaging (WB-CSA) method was modified and applied to the analysis of the acoustic signal and the unsteady visualization data obtained from wind-tunnel tests. The analysis successfully visualized the process of acoustic wave generation caused by large-scale disturbances. The mechanism was further studied by the numerical simulation. It was shown that the acoustic waves emanate from the interaction between the disturbance and the shock waves.

Academic Significance and Societal Importance of the Research Achievements

ジェットエンジンやロケットから騒音が発生するメカニズムの研究。騒音の源になっている変動の発生場所や、その変動が衝撃波と干渉して音波を発生する様子を、従来よりも分かりやすい形で視覚的に確認することが出来た。この研究により、騒音を大幅に低減できる可能性が広がる。また、ここで開発したデータ解析手法は、間欠的かつ不規則に発生する現象をはっきりと取り出すことができるので、他の流体解析にも応用することができる。

Research Products

• [Journal Article] Acoustic Wave Generation from Two-Dimensional Supersonic Inviscid Jet Impinging on Inclined Plate (2020)
  • Author(s): Kurokawa Masashi、Teramoto Susumu、Okamoto Koji
  • Journal Title: AIAA Journal Volume: 58 Issue: 8 Pages: 3436-3445
  • DOI: 10.2514/1.j059012
  • Peer Reviewed
• [Journal Article] Data-educed, broadband equivalent acoustic source model for supersonic jet noise (2019)
  • Author(s): Neilsen, T.B., Vaughn, A.B., Gee, K.L., Akamine, M., Okamoto, K., Teramoto S., and Tsutsumi, S.
  • Journal Title: The Journal of the Acoustical Society of America Volume: 146 Pages: 3409-3424
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Conditional sampling analysis of high-speed schlieren movies of Mach wave radiation in a supersonic jet (2019)
  • Author(s): Akamine Masahito、Okamoto Koji、Teramoto Susumu、Tsutsumi Seiji
  • Journal Title: The Journal of the Acoustical Society of America Volume: 145 Issue: 1 Pages: EL122-EL128
  • DOI: 10.1121/1.5088493
  • Peer Reviewed
• [Journal Article] Effect of Nozzle?Plate Distance on Acoustic Phenomena from Supersonic Impinging Jet (2018)
  • Author(s): Akamine Masahito、Okamoto Koji、Gee Kent L.、Neilsen Tracianne B.、Teramoto Susumu、Okunuki Takeo、Tsutsumi Seiji
  • Journal Title: AIAA Journal Volume: 56 Issue: 5 Pages: 1943-1952
  • DOI: 10.2514/1.j056504
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Acoustic Phenomena Generated by Interactionbetween a Supersonic Jet Impinging to a Flat Plate and a Vortex (2018)
  • Author(s): KONNO Chihiro、TERAMOTO Susumu、AKAMINE Masahito、OKAMOTO Koji
  • Journal Title: JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES Volume: 66 Issue: 1 Pages: 24-30
  • DOI: 10.2322/jjsass.66.24
  • NAID: 130006337715
  • ISSN: 1344-6460, 2432-3691
  • Peer Reviewed
• [Presentation] 超音速ジェットから間欠的に生じる音波の周方向相関 (2020)
  • Author(s): 赤嶺政仁，寺本進，岡本光司，堤誠司
  • Organizer: 流体力学講演会／航空宇宙数値シミュレーション技術シンポジウム
• [Presentation] モード解析と条件付抽出解析によって得られた乱流ジェット騒音の特徴量比較 (2020)
  • Author(s): 赤嶺政仁，堤誠司，寺本進，岡本光司，野中聡
  • Organizer: 日本流体力学会年会
• [Presentation] ハーモニックバランス解析のLES乱流計算 への拡張についての検討 (2020)
  • Author(s): 岩本 雄馬, 寺本 進, 岡 本 光司
  • Organizer: 第34回すうち流体力学シンポジウム
• [Presentation] Comparison of Modal and Conditional Analyses for Intermittent Phenomena in Jet Noise (2020)
  • Author(s): Masahito Akamine, Seiji Tsutsumi, Koji Okamoto, Susumu Teramoto, Satoshi Nonaka
  • Organizer: AIAA Scitech 2020
  • Int'l Joint Research
• [Presentation] isualization and acoustic-triggered conditional sampling analysis of acoustic phenomena with screech-tone of an over-expanded supersonic jet (2019)
  • Author(s): Takemura, M., Okamoto, K., and Teramoto, S.,
  • Organizer: 178th Meeting of the Acoustical Society of America
  • Int'l Joint Research
• [Presentation] ジェット騒音の間欠現象における動的モード分解から得られた特徴量の理解 (2019)
  • Author(s): 赤嶺政仁，堤誠司，岡本光司，寺本進，野中聡
  • Organizer: 第37回航空宇宙数値シミュレーション技術シンポジウム
• [Presentation] Visualization and Temperature Measurement of Cryogenic Cooling Channel Flow at Supercritical Pressure (2019)
  • Author(s): Takahiko Toki, Masayuki Morita, Susumu Teramoto, Kazuo Yamaguchi, Koji Okamoto
  • Organizer: AIAA Scitech 2019 Forum
  • Int'l Joint Research
• [Presentation] Laser optical measurement of acoustic phenomena in the near field of a supersonic jet using 2-D position sensitive detector (2018)
  • Author(s): Okamoto, K., Fukatsu, K., Akamine, M., and Teramoto, S.
  • Organizer: 176th Meeting of the Acoustical Society of America
  • Int'l Joint Research
• [Presentation] Visualization of acoustic phenomena of imperfectly expanded supersonic jets using acoustic-triggered conditionalsampling analysis (2018)
  • Author(s): Sekiguchi, Y., Okamoto, K., and Teramoto, S
  • Organizer: 176th Meeting of the Acoustical Society of America
  • Int'l Joint Research
• [Presentation] 翼列のLES解析におけるブロック境界条件の影響 (2018)
  • Author(s): 李 允台, 寺本 進, 岡本 光司
  • Organizer: 第32回数値流体力学シンポジウム
• [Presentation] 超音速衝突噴流における渦と衝撃波の干渉から生じる音響現象 (2018)
  • Author(s): 黒川 将志, 寺本 進, 岡本 光司
  • Organizer: 第32回数値流体力学シンポジウム
• [Presentation] 翼列LES解析に向けた高次精度ブロック境界条件の検証 (2018)
  • Author(s): 李允台,寺本進,岡本光司
  • Organizer: 第46回日本ガスタービン学会定期講演会
• [Presentation] 斜め平板への超音速衝突噴流における渦と衝撃波の干渉によって生じる音響現象に関する数値解析 (2018)
  • Author(s): 黒川 将志，寺本 進，岡本 光司
  • Organizer: 第59回航空原動機・宇宙推進講演会
• [Presentation] 過膨張噴流から発生する音響現象の条件付抽出解析 (2018)
  • Author(s): 関口 侑矢，岡本 光司，寺本 進
  • Organizer: 第59回航空原動機・宇宙推進講演会
• [Presentation] 音響トリガ条件付抽出解析におけるトリガ 検出方法の影響とモード解析との比較 (2018)
  • Author(s): 赤嶺 政仁，岡本 光司，寺本 進，堤 誠司，野中 聡
  • Organizer: 第59回航空原動機・宇宙推進講演会