• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1995 Fiscal Year Final Research Report Summary

Combustion of Transient Gas Fuel Jet and Process of Entrainment of Ambient Air into Jet

Research Project

Project/Area Number 06650248
Research Category

Grant-in-Aid for General Scientific Research (C)

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

Principal Investigator

YOSHIYAMA Sadami  Okayama University, Faculty of Engineering, Research Associate., 工学部, 助手 (80210780)

Co-Investigator(Kenkyū-buntansha) HAMAMOTO Yoshisuke  Okayama University, Faculty of Engineering, Professor., 工学部, 教授 (60025955)
Project Period (FY) 1994 – 1995
KeywordsJet / Transient Jet / Visualization / Impinging Jet / Laser-aided Diagnostics / Air Mass Entrained / Diffusion Flame / Turbulent Mixing
Research Abstract

It is well known that the process of mixture formation in direct injection engine such as diesel engine has great influence on the combustion in the cylinder. It is very important to understand the entrainment process of amibient air into the jet or spray in detail. However, few studies have been done on the entrainment process. The fuel injected into the cylinder with high pressure and high temperature in a diesel engine evaporates and goes through with entraining the ambient air. Therefore, for understanding the phenomena easily, a gas was injected for the reason of ignoring the evaporation process and the entrainment process is investigated under the amibient air with atmospheric pressure and room temperature.
In this study, a laser sheet was passed through the cross section of the jet that contained the jet axis or was perpendicular to the jet axis. The instantaneous image of the transient jet and the movement of the ambient air were visualized with fine particles and micro-balloons … More , respectively. A path line method for micro-balloons utilizing a CCD shutter camera was applied for obtaining the air mass entrained into a transient gas jet approximately. In the case of the flame, which was formed by igniting the hydrogen jet at the initiation of the jet, the air flowed into the jet was as the same sa in the jet without combustion. However, the rate of air flowed into the jet per unit surface area was smaller and decreased with time. When the timing of the ignition was delayd after the initiation of the jet injection, the combustible mixture was formed in advance and the air flowed into the jet increased because of turbulent diffusion due to the rapid combustion.
It is also said that the combustible mixture increases in impinging on a wall because of turbulent diffusion. The same method was applied to the jet impinging on a flat wall in order to inveatigate the entrainment of the ambient air into the jet. As a result, the air mass flowed into the jet impinging on a flat wall increased after the impingement for a while, but was almost the same when the time passed more and more even in the injection period. It was found that the rolled up region near the jet tip casused the ambient air flow into the jet. The compact structures that would correspond to the scale of the vortex were disposed regularly near the rolled up region. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 冨田栄二: "非定常壁面衝突噴流と周囲気体の流れの画像計測" 自動車技術会論文集. 25. 70-75 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 冨田栄二: "非定常壁面衝突噴流への周囲空気導入の画像計測" 自動車技術会論文集. 26. 57-62 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eiji Tomita: "Measurement of Ambient Air Entrainment into Transient Free Gas Jet by Means of Flow Visualization" SAE Paper No. 950056. (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 吉山定見: "非定常気体噴流に関する研究" 日本機械学会関西支部第70期定時講演会講演論文集. 954-2. 194-186 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eiji Tomita: "Visualization of Ambient Air Motion and Entrainment into a Transient Gas Jet Impinging on a Flat Wall" SAE Paper No. 952513. (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eiji Tomita: "Flow Visualization and Digital Image Processing of Transient Gas Jet Impinging on a Wall and Surrounding Air with a High Power Diode Pumped Solid State Laser and High Speed Video System of Ambient inment" Proceedings of 3rd Asin Symposium on Visualization. 717-722 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eiji Tomita: "Visualization of Transient Hydrogen Jet Flame and Ambient Air Entrainment Motion, in Transport Phenmena in Combution" Taylor and Francic (in press), (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi and Shiro Takasaki: ""Digital Image Processing of Transient Gas Jet Impinging on a Flat Wall and Its Surrounding Gas Flow", (in Japanese)" Trans.of JSAE. Vol.25, No.2. 70-75 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi and Toru Watanabe: ""Image Processing of Entrainment of Ambient Air into Transient Gas Jet Impinging on a Flat Wall", (in Japanese)" Trans.of JSAE. Vol.26, No.3. 57-62 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi and Sadami Yoshiyama: ""Measurement of Ambient Air Entrainment into Transient Free Gas Jet by Means of Flow Visualization"" SAE Paper. No.950056. 1-12 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sadami Yoshiyama, Eiji Tomita, Yoshisuke Hamamoto, Toru Watanabe and Kenshi Tanabe: ""A Study on Transient Gas Jet", (in Japanese)" Preprint of the Japan Society of Mechanical Engineers. No.954-2. 184-186 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi, Shiro Takasaki and Koichi Akiyama: ""Flow Visualization and Digital Image Processing of Transient Gas Jet Impinging on a Wall and Surrounding Air with a High Power Diode Pumped Solid State Laser and High Speed Video System"" Proc.of 3rd Asian Symposium on Visualization. 717-722 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi and Sadami Yoshiyama: ""Visualization of Ambient Air Motion and Entrainment into a Transient Gas Jet Impinging on a Flat Wall"" SAE Paper. No.950056. 1-13 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi, Toru Watanabe and Sadami Yoshiyama: ""Visualization of Transient Hydrogen Jet Flame and Ambient Air Entrainment Motion", in "Transport Phenomena in Combustion"" Taylor and Francic. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1997-03-04  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi