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Entropy generation and thermal efficiency of thermoacoustic engine

Research Project

Project/Area Number 16H06070
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionTokai University

Principal Investigator

Hasegawa Shinya  東海大学, 工学部, 准教授 (30580500)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
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)
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 / 比音響インピーダンス / 再生可能エネルギー / 散逸構造
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.

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.

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (15 results)

All 2019 2018 2017 2016

All Presentation (13 results) (of which Int'l Joint Research: 5 results) Patent(Industrial Property Rights) (2 results)

  • [Presentation] 蓄熱器流路半径と熱境界層暑さの比に対する進行波型熱音響機関の熱効率依存性2019

    • Author(s)
      千賀麻利子,長谷川真也
    • Organizer
      第24回動力・エネルギー技術シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] エントロピー生成による熱音響機関の不可逆性に関する研究2019

    • Author(s)
      長谷川真也,千賀麻利子
    • Organizer
      東海大学産学連携フェア2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 定在波型熱音響機関の強制同期時におけるヒステリシス2019

    • Author(s)
      千賀麻利子,長谷川真也
    • Organizer
      Dynamics and Design Conference 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Study of Relation between Entropy Flux Density Production and Thermal Efficiency of a Thermoacoustic Engine2019

    • Author(s)
      Mariko SENGA, Shinya HASEGAWA
    • Organizer
      23rd International Congress on Acoustics (ICA2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 進行波型熱音響機関の熱効率に関する実験検討(インピーダンスおよび流路半径と熱境界層厚さの比に対する依存性)2019

    • Author(s)
      千賀麻利子,長谷川真也
    • Organizer
      第67回応用物理学会春季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] DEPENDENCE OF CHANNEL RADIUS AND ACOUSTIC IMPEDANCE ON ENTROPY FLUX DENSITY PRODUCTION OF TRAVELING WAVE THERMOACOUSTIC ENGINES2018

    • Author(s)
      Mariko Senga,Shinya Hasegawa
    • Organizer
      25th international Congress on Sound and Vibration
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 熱音響機関の不可逆性に関する研究2018

    • Author(s)
      千賀麻利子,長谷川真也
    • Organizer
      東海大学産学連携フェア2018
    • Related Report
      2018 Annual Research Report
  • [Presentation] Measurement of Entropy Production of Forced Synchronization in a Standing Wave Thermoacoustic Engine2017

    • Author(s)
      Mariko Senga,Shinya Hasegawa
    • Organizer
      MNTC International Symposium2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Transition of Entropy Production from Fundamental Oscillation to Quasiperiodic Oscillation in a Standing Wave Thermoacoustic Engine2017

    • Author(s)
      Mariko Senga,Shinya Hasegawa
    • Organizer
      MNTC International Symposium2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical Calculation of a Quarter-Wavelength Mode Thermoacoustic Engine with a Variable Acoustic Load in a Looped Tube2017

    • Author(s)
      Mariko Senga,Shinya Hasegawa
    • Organizer
      The Ninth JSME-KSME Thermal and Fluids Engineering Conference
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 熱音響自励振動系におけるカオス遷移時のエントロピー流測定2016

    • Author(s)
      千賀麻利子,葛生和人,長谷川真也,森山裕幸
    • Organizer
      日本流体学会年会2016
    • Place of Presentation
      名古屋工業大学御器所キャンパス
    • Related Report
      2016 Annual Research Report
  • [Presentation] 熱音響自励振動系に外力を入力した際のエントロピー流測定2016

    • Author(s)
      千賀麻利子,長谷川真也
    • Organizer
      2016年度第2回応用熱音響研究会
    • Place of Presentation
      東京農工大学 小金井キャンパス
    • Related Report
      2016 Annual Research Report
  • [Presentation] 熱音響自励振動系のカオス遷移時におけるエントロピー流測定2016

    • Author(s)
      千賀麻利子,長谷川真也
    • Organizer
      2016年度第2回応用熱音響研究会
    • Place of Presentation
      東京農工大学 小金井キャンパス
    • Related Report
      2016 Annual Research Report
  • [Patent(Industrial Property Rights)] 蓄熱器の設計方法、設計装置及びプログラム2019

    • Inventor(s)
      長谷川真也,千賀麻利子
    • Industrial Property Rights Holder
      長谷川真也,千賀麻利子
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-109940
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 枝管付きループ型熱音響機関2017

    • Inventor(s)
      長谷川真也,千賀麻利子
    • Industrial Property Rights Holder
      学校法人 東海大学
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2017-206821
    • Filing Date
      2017
    • Related Report
      2017 Annual Research Report

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Published: 2016-04-21   Modified: 2021-02-19  

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