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Study on the Atomization Gasification, Mixing and Combustuin Processes of Liquid fuel Jets in Supercritical Enironments

Research Project

Project/Area Number 11650219
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionNagoya University

Principal Investigator

UMEMURA Akira  Nagoya University Department of Aerspace Engineering, Professor, 工学研究科, 教授 (60134152)

Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
KeywordsSupercritical Ambience / Spray Combustion / Atomization Mechanism / Ignition Delay Time Vortex Burstion / Vortex Burstion / Critical Mixing Surface / Turbulence / Hydrodynamic Action / 高圧ジェット / 微粒化 / 表面張力 / 噴霧 / 線形安定性解析 / 液糸 / ジェット / 空力作用 / 近臨界混合表面 / 微小重力 / ウェーバー数 / ペアリング / 高圧 / 噴流の不安定性 / 連続的相変化 / 着火特性 / 数値シミュレーション / 理論解析
Research Abstract

Analyzes were made of characteristic processes involved in the combustion of sprays which are formed when liquid fuel is injected into the air whose thermodynamic state exceeds the critical point of the fuel. The following were found. ( 1) Despite the convectional belief that droplet auto-ignition delay time shortens monotonically with increasing pressure, it was found that the droplet auto-ignition delay time takes a peak at the ambient states near to the fuel critical point. This secular behavior is due to the influence of the phase equilibrium condition at droplet surface. Considering that current diesel engines operate at such condition, this knowledge addresses an interesting problem of finding an optimum spray condition for fast combustion. (2) Atomization is a keytechnology to spray combustion. However, the understanding of atomization mechanism involved in high-pressure sprays used in liquid rocket engines and diesel engines are very poor because optical observation is very difficult at high pressures. The current concept is based on the knowledge obtained from the experiments of water jet atomization at standard pressure. We examined the instability of jets with near-critical mixing surface and found a new instability mode with growth rate proportional to jet speed, which can make the liquid jetbroken into droplets with short spacing with the aids of hydrodynamic action. This finding theoretically bases the formation of dense sprays constituting of fine droplets at high pressures, if we regard a low-speed liquid jet as one of the liquid ligaments formed in the turbulent atomization process of an injected liquid. Furthermore, we studies (3) the mechanism of rapid flame propagation through combustible vortices formed in the process of turbulent mixing and (4) the modes of flame spreading between droplets for a various kind of sprays.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] 梅村章, 富田浩一: "可燃性混合気渦の中を伝わる火炎の数理的研究 (第1報:新しい高速火炎伝播機構の提案)"日本機械学会論文集B編. 65. 3169-3176 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 梅村章, 富田浩一: "可燃性混合気渦の中を伝わる火炎の数理的研究 (第2報:数値的検証)"日本機械学会論文集B編. 65. 3177-3184 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Umemura, S.Takamori: "Wave Nature in Vortex Bursting Initiation"Proc. Combust. Inst.. 28. 1941-1948 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A.Umemura, K.Tomida: "Rapid Flame Propagation in a Vortex Tube in Perspective of Vortex Breakdown Phenomena"Combustion Flame. 125. 820-838 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 若嶋勇一郎, 菱田学, 梅村章: "微小重力場での近臨界表面液ジェットの不安定性 (第1報:実験結果)"日本機械学会論文集B編. (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 梅村章, 若嶋勇一郎: "微小重力場での近臨界表面液ジェットの不安定性 (第2報:理論的考察)"日本機械学会論文集B編. (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Umemura & K. Tomida: "Mathematics and Physics of Flame Propagation in Combustible Vortices (First Report : Proposed New Mechanism of Rapid Flame Propagation)"Trans. JSME(B). 65. 3169-3176 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Umemura & K. Tomida: "Mathematics and Physics of Flame Propagation in Combustible Vortices (First Report : Numerical Validation)"Trance. JSME(B). 65. 3177-3184 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Umemura & S. Takamori: "Wave Nature in Vortex-Bursting Initiation"Proc. Combust. Inst.. 28. 1941-1948 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Umemura & K. Tomida: "Rapid Flame Propagation in a Vortex Tube in Perspective of Vortex B reakdown Phenomena Y. Wakashima, M. Hishida &A. Umemura / Instability of Near-Critical Mixing Surface Jet in Microgravity (First Report : Experimental Result)"Combust. Flame. 125. 820-838 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Wakashima, M. Hishida & A. Umemura: "Instability of Near-Critical Mixing Surface Jet in Microgravity (First Report : Experimental Result)"Trans. JSME(B). (in print). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] A. Umemura & Y. Wakashim: "nstability of Near-Critical Mixing Surface Jet in Microgravity (First Report : Theoretical Consideration)"Trans. JSME(B). (in print). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Umemura, A., Tomida, K.: "Rapid Flame Propagation in a Vortex Tube in Perspective of Vortex Breakdown Phenomena"Combustion Flame. 125. 820-838 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 若嶋勇一郎, 菱田学, 梅村章: "微小重力場での近臨界表面液ジェットの不安定性(第1報:実験結果)"日本機械学会論文集(B編). (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 梅村章, 若嶋勇一郎: "微小重力場での近臨界表面液ジェットの不安定性(第2報:理論的考察)"日本機械学会論文集(B編). (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 太田貴之, 高森昭一, 梅村章: "パーコレーション理論に基づく噴霧群燃焼発生機構の解析"第39回燃焼シンポジウム講演論文集. 159-160 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 安藤拓, 内田正宏, 梅村章: "液滴の自着火および火炎挙動に対するマランゴニ対流の影響"第39回燃焼シンポジウム講演論文集. 215-216 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 梅村章: "ボルテックス・バースティング研究の現状〜理論的側面から見て〜"燃料研究. 第122号. 35-48 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Umemura,A.& Takamori,S.: "Wave Nature in Vortex Burting Intiation"Proc.Combust.Inst.. 28. (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Takamori,S.& Umemura,A.: "A Study on Intial Stage of Vortex Bursting"Proceedings of the Third International Symposium on Scale Modeling, Nagoya. (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 若嶋勇一郎,菱田学,梅村章: "超臨界雰囲気中に噴射されたSF6微細ジェットの可視化実験"第38回燃焼シンポジウム講演論文集. 133-134 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Umemura: "Mathematics and Physics for Supercritical Spray Combustion Reserch"IMA Annual program,Workshop"Low-speed Combustion" Universty of Minnesota. (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 山崎崇、梅村章: "超臨界圧下での燃料液滴の自着火過程"第37回燃焼シンポジウム講演論文集. 147-148 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 梅村章、富田浩一: "可燃性混合気渦の中を伝わる火炎の数理的研究(第一報:新しい高速火炎伝播機構の提案)"日本機械学会論文集B編. 65-637. 3169-3176 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 梅村章、富田浩一: "可燃性混合気渦の中を伝わる火炎の数理的研究(第2報:数値的検証)"日本機械学会論文集B編. 65-637. 3177-3184 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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