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Modeling of Spray Formation Mechanism and Numerical Simulation of Spray Flow

Research Project

Project/Area Number 09650217
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

INAMURA Takao  Hirosaki University, Faculty of Science and Technology, Professor, 理工学部, 教授 (10143017)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1997: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsNumerical Simulation / Liquid Jet / liquid Atomization / Instability Analysis / Disintegration Mechanism / Wave Formation / Rocket Engine / Atomization Characteristics / 微粒化機構 / 液体燃料 / 液柱の不安定性 / 噴霧燃焼 / 噴霧生成
Research Abstract

This study aims to clarify the disintegration process of a liquid jet using a plain-jet atomizer and to model the disturbance wave inception on a liquid jet surface and the growth process of disturbance waves. Final target of this study is to complete an universal numerical simulation algorithm of spray flow including a model of spray formation mechanism. Firstly, the influences of the characteristics of vortices in the liquid flow in an atomizer on the disturbance wave inception on a liquid jet surface, were investigated using a numerical simulation. The vortex in a liquid flow was simulated by a Rankine vortex. The following results were obtained ; The vortex with a rotational direction in which a liquid jet surface is decelerated, affects greatly the wave inception. The wavelength of the disturbance waves on the surface is determined by the distance between vortices with above rotational direction. Secondly, the facts that the detachment of droplets from the liquid jet surface is ca … More used by the growth of small disturbance waves on the surface and the liquid jet itself is disintegrated due to the growth of a relatively large non-axisymmetric waves, were clarified by the observation of the spray formation process.
Based on the observation, the model of spray formation mechanism was proposed. The each axisymmetric wave within whole wave number range is concerned in the spray formation from the liquid jet surface. And the non-axisymmetric wave with maximum growth rate is concerned in liquid jet disintegration itself. The numerical simulations of the droplet formation using the proposed model showed good agreements with theexperiments except intact-core length. Finally, the numerical simulations of the spray flow using the proposed model of spray formation mechanism were carried out. The predicted air velocity, droplet velocity, droplet mean diameter were coincident moderately with the measurements. However, the droplet dispersion was under-estimated. This discrepancy can be contributed to the estimation of a droplet initial velocity and the droplet turbulent dispersion model. In a future, the modeling of the relationship between the turbulence in the liquid flow in an atomizer and the disturbance wave characteristics on a liquid surface, should be necessary. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 蔦川武仁: "気液同軸噴流の界面不安定性" 日本航空宇宙学会北部支部1998年講演会前刷集. 73-78 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 稲村隆夫: "液柱表面における乱れの初生と成長のモデリング" 第76期日本機械学会全国大会講演会前刷集. 83-84 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 稲村隆夫: "静止空気中での液噴流表面の挙動に関する数値シミュレーション" 日本機械学会論文集(B編). 65 (印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takehito Tsutagawa: "Instability of Liquid Jet Surface near the Coaxial Injector Exit" Proc.JSASS Northern Sec. Annual Meeting'1998. 73-78 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takao Inamura: "Modeling of the Inception and the Growth of Disturbance Waves on a Liquid Jet Surface" Proc.The 76th JSME Fall Annual Meeting. 83-84 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takao Inamura: "Numerical Simulation on Behavior of Liquid Jet Issued into Still Air" Trans.JSME. Vol.65, No.631, B(1999)(in Press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 蔦川武仁: "気液同軸噴流の界面不安定性" 日本航空宇宙学会北部支部1998年講演会前刷集. 73-78 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 稲村隆夫: "液柱表面における乱れの初生と成長のモデリング" 第76期日本機械学会全国大会講演会前刷集. 83-84 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 稲村隆夫: "静止空気中での液噴流表面の挙動に関する数値シミュレーション" 日本機械学会論文集(B編). 65・631(印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 趙成鎭: "二流体噴射弁出口近傍における気液界面の変形特性" 日本航空宇宙学会北部支部1999年講演会前刷集. (発表予定). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 蔦川武仁: "気液同軸噴流の界面不安定" 日本航空宇宙学会北部支部1998年講演会講論集. 73-78 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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