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Hot air recirculation around air-cooled heat exchangers in plants

Planned Research

Project AreaMicro-meteorology control: Integrated technology of harmonic prediction and active monitoring of micro-meteorology for future autonomous society
Project/Area Number 20H05754
Research Category

Grant-in-Aid for Transformative Research Areas (B)

Allocation TypeSingle-year Grants
Review Section Transformative Research Areas, Section (II)
Research InstitutionNagoya University

Principal Investigator

Watanabe Tomoaki  名古屋大学, 工学研究科, 准教授 (70772292)

Co-Investigator(Kenkyū-buntansha) 長田 孝二  名古屋大学, 工学研究科, 教授 (50274501)
Project Period (FY) 2020-10-02 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥33,930,000 (Direct Cost: ¥26,100,000、Indirect Cost: ¥7,830,000)
Fiscal Year 2022: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Fiscal Year 2021: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
Fiscal Year 2020: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Keywords微気象 / 流体工学 / Hot Air Recirculation / プラント / 数値シミュレーション
Outline of Research at the Start

大型プラント内の熱交換器において、高温排熱気塊が風下側の各種装置に吸い込まれる事により装置の性能低下を引き起こすHot Air Recirculation(HAR)が問題になっている。人工物の影響を強く受ける地表付近の気象現象(微気象現象)がHAR発生において重要となると予想される。排熱源をモデル化した流れの数値計算によりHAR発生メカニズムを明らかにし、その予測に必要な気象情報の時空間スケールを同定する。微気象情報と実プラントでの観測結果の比較により、微気象情報に基づくHAR予測が可能であるかを検証する。さらに、微気象シミュレーションによるリアルタイムHAR予測システムのテストを行う。

Outline of Final Research Achievements

Numerical simulations were performed for jets in a crossflow, which resemble heat dispersion observed for air-cooled heat exchangers used at plants. High-temperature fluid tends to stay near the ground because of the interaction of the multiple jets and the swirl motion of the jets. The process by which long-elongated turbulent structures with high temperature are generated was investigated by numerical simulations of turbulent flows. A flow similar to the hot-air recirculation at plants was successfully reproduced in wind-tunnel experiments of a model of air-cooled heat exchangers. Observational experiments were also conducted to obtain data on heat dispersion in a microclimate environment. These phenomena were shown to be well predicted by microclimate simulations.

Academic Significance and Societal Importance of the Research Achievements

大型プラント内の列をなした空冷式熱交換器において、高温排熱気塊が風下側の熱交換器や各種装置に吸い込まれる事により装置の性能低下を引き起こすHot Air Recirculation(HAR)と呼ばれる現象が問題になっている。本成果によりプラントにおいてHARを引き起こす可能性がある現象が明らかとなった。また、HAR類似現象を微気象シミュレーションにより再現できることが確認された。微気象シミュレーションから得られる情報を基にHAR発生を事前予測しプラント運用を最適化することにより、HAR現象に起因するプラント運用効率の低下を防ぐことができると期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (30 results)

All 2023 2022 2021 2020

All Journal Article (9 results) (of which Peer Reviewed: 9 results) Presentation (21 results) (of which Int'l Joint Research: 8 results,  Invited: 8 results)

  • [Journal Article] Vertical confinement effects on a fully developed turbulent shear layer2022

    • Author(s)
      T. Akao, T. Watanabe, K. Nagata
    • Journal Title

      Physics of Fluids

      Volume: 34 Issue: 5 Pages: 055129-055129

    • DOI

      10.1063/5.0090686

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The decay of stably stratified grid turbulence in a viscosity-affected stratified flow regime2022

    • Author(s)
      T. Watanabe, Y. Zheng, K. Nagata
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 946

    • DOI

      10.1017/jfm.2022.617

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Energetics and vortex structures near small-scale shear layers in turbulence2022

    • Author(s)
      T. Watanabe, K. Nagata
    • Journal Title

      Physics of Fluids

      Volume: 34 Issue: 9 Pages: 095114-095114

    • DOI

      10.1063/5.0099959

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Large- and small-scale characteristics in a temporally developing shearless turbulent mixing layer2022

    • Author(s)
      K. Nakamura, T. Matsushima, Y. Zheng, K. Nagata, T. Watanabe
    • Journal Title

      Physics of Fluids

      Volume: 34 Issue: 11 Pages: 115117-115117

    • DOI

      10.1063/5.0121047

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The relation between shearing motions and the turbulent/non-turbulent interface in a turbulent planar jet2021

    • Author(s)
      Hayashi M.、Watanabe T.、Nagata K.
    • Journal Title

      Physics of Fluids

      Volume: 33 Issue: 5 Pages: 055126-055126

    • DOI

      10.1063/5.0045376

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Statistical properties of a model of a turbulent patch arising from a breaking internal wave2021

    • Author(s)
      T. Katagiri, T. Watanabe, K. Nagata
    • Journal Title

      Physics of Fluids

      Volume: 33 Issue: 5 Pages: 055107-055107

    • DOI

      10.1063/5.0046832

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Characteristics of small-scale shear layers in a temporally evolving turbulent planar jet2021

    • Author(s)
      Hayashi Masato、Watanabe Tomoaki、Nagata Koji
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 920

    • DOI

      10.1017/jfm.2021.459

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Large-scale characteristics of a stably stratified turbulent shear layer2021

    • Author(s)
      Watanabe Tomoaki、Nagata Koji
    • Journal Title

      Journal of Fluid Mechanics

      Volume: 927

    • DOI

      10.1017/jfm.2021.773

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The relation between shearing motions and the turbulent/non-turbulent interface in a turbulent planar jet2021

    • Author(s)
      M. Hayashi, T. Watanabe, K. Nagata
    • Journal Title

      Physics of Fluids

      Volume: 未定

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 主流と直交する旋回噴流群による熱拡散の数値解析2023

    • Author(s)
      古田作, 渡邉智昭, 長田孝二
    • Organizer
      第3回「微気象制御学」領域シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 大型プラント内の異常高温排熱塊の発生要因解明とモデル化2023

    • Author(s)
      渡邉智昭, 長田孝二
    • Organizer
      第3回「微気象制御学」領域シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 速度こう配テンソルの三成分分解による乱流噴流のエネルギ輸送解析2022

    • Author(s)
      榎亮, 渡邉智昭, 長田孝ニ
    • Organizer
      日本機械学会2022年度年次大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 平行格子により生成される無せん断乱流混合層の直接数値計算2022

    • Author(s)
      中村浩太郎, 松島哲也, 渡邉智昭, 長田孝ニ
    • Organizer
      日本機械学会2022年度年次大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Direct numerical simulation of turbulent mixing in a heated swirling jet issued into a cross-flow2022

    • Author(s)
      T. Furuta, T. Watanabe, K. Nagata, X. Hu, K. Matsuda, R. Onishi, S. Qian
    • Organizer
      WCCM-APCOM 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Model intercomparison study of jet in cross flow for prediction of hot air recirculation2022

    • Author(s)
      X. Hu, R. Onishi, T. Furuta, K. Matsuda, K. Nagata, S. Qian, T. Watanabe
    • Organizer
      WCCM-APCOM 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Sensitivity study of turbulence models and mesh size for CFD simulations of jet in cross flow for prediction of hot air recirculation2022

    • Author(s)
      S. Qian, X. Hu, T. Furuta, K. Matsuda, K. Nagata, R. Onishi, T. Watanabe
    • Organizer
      WCCM-APCOM 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The characteristics of elongated large-scale structures in a wall-confined shear layer2022

    • Author(s)
      T. Akao, T. Watanabe, K. Nagata
    • Organizer
      The 19th International Conference on Flow Dynamics
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 無せん断乱流混合層における乱流・乱流界面の特性2022

    • Author(s)
      中村浩太郎, 渡邉智昭, 長田孝ニ
    • Organizer
      日本機械学会第100期流体工学部門講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 主流と直交する旋回噴流群による乱流熱拡散の数値解析2022

    • Author(s)
      古田作, 渡邉智昭, 長田孝二, 胡希東, 松田景吾, 大西領, 銭紹祥
    • Organizer
      日本機械学会第100期流体工学部門講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 鉛直方向運動の束縛を受ける乱流混合層の発達に関する数値解析2022

    • Author(s)
      赤尾拓海, 渡邉智昭, 長田孝ニ
    • Organizer
      第20回日本流体力学会中部支部講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Wall-confinement effects on the development of a turbulent shear layer2022

    • Author(s)
      T. Akao, T. Watanabe, K. Nagata
    • Organizer
      The 7th International Conference on Jets, Wakes and Separated Flows
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 大型プラント内の異常高温排熱塊の発生要因解明とモデル化2022

    • Author(s)
      渡邉智昭, 長田孝二
    • Organizer
      第2回「微気象制御学」領域シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 主流に直交する旋回噴流の数値解析2022

    • Author(s)
      古田作, 渡邉智昭, 長田孝二
    • Organizer
      第2回「微気象制御学」領域シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Characteristics of small-scale shear layers in isotropic turbulence2022

    • Author(s)
      T. Watanabe, K. Nagata
    • Organizer
      JSPS Bilateral Workshop 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 安定密度成層下のせん断乱流の乱流構造と拡散現象に関する研究2021

    • Author(s)
      渡邉智昭
    • Organizer
      日本流体力学会年会2021
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 安定密度成層下のせん断乱流の大スケール構造2021

    • Author(s)
      渡邉智昭, 長田孝二
    • Organizer
      第2回「微気象制御学」領域ワークショップ
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 大型プラント内の異常高温排熱塊の発生要因解明とモデル化2021

    • Author(s)
      渡邉智昭
    • Organizer
      「微気象制御学」領域シンポジウム
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Turbulent/non-turbulent interface in a turbulent patch arising from a breaking internal wave2020

    • Author(s)
      T. Katagiri, T. Watanabe, K. Nagata
    • Organizer
      The 73rd Annual Meeting of the APS Division of Fluid Dynamics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Analysis of velocity gradient tensor in a turbulent planar jet with triple decomposition2020

    • Author(s)
      M. Hayashi, T. Watanabe, K. Nagata
    • Organizer
      The 73rd Annual Meeting of the APS Division of Fluid Dynamics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 乱流平面噴流における内部せん断層の解析2020

    • Author(s)
      林雅人,渡邉智昭,長田孝二
    • Organizer
      第18回日本流体力学中部支部講演会
    • Related Report
      2020 Annual Research Report

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Published: 2020-10-30   Modified: 2024-01-30  

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