Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants|
|Research Institution||Doshisya University|
FUJIMOTO Hajime Doshisya University, Department of Mechanical Engineering, Professor, 工学部, 教授 (90051630)
KAWAI Terunao Shiga Prefecture University, Department of Mechanical System Engineering, Resear, 工学部, 助手 (90275173)
SENDA Jiro Doshisya University, Department of Mechanical Engineering, Professor, 工学部, 教授 (30226691)
|Project Period (FY)
1996 – 1998
Completed(Fiscal Year 1998)
|Budget Amount *help
¥6,500,000 (Direct Cost : ¥6,500,000)
Fiscal Year 1998 : ¥500,000 (Direct Cost : ¥500,000)
Fiscal Year 1997 : ¥2,100,000 (Direct Cost : ¥2,100,000)
Fiscal Year 1996 : ¥3,900,000 (Direct Cost : ¥3,900,000)
|Keywords||unsteady diffustion flame / OH radical natural emission / soot / flame temperature / laser induced scattering / laser induced incandescence / two-color method / simulation / 非定常拡散噴霧火炎 / 火炎温度 / 画像二色法 / 相対すす濃度 / OHラジカル / 燃料蒸気濃度分布 / 拡散噴霧火炎 / 窒素酸化物 / 流動解析 / レーザ誘起蛍光法 / レーザ赤熱法 / レーザ弾性散乱法|
The outline of research results conducted during the term of this project is as follows :
1)Modeling of unsteady and evaporating spray impinging on a flat and hot wall
The evaporating process of an unsteady spray impinging on a flat and hot wall is simulated precisely by use of new three models, that is, droplet breakup model, droplet dispersion model and heat transfer model, as the significant step of the simulation of its flame. They can express all the evaporation phenomena of non-boiling, nucleate, transition and filmboilings. The objective spray is simulated by KIVA-II original code applying these models. The simulated results of distributions of fuel vapor concentration and droplet parcels agree very well the experimental results detected by the laser induced method.
2)Combustion analysis of unsteady diffusion flame of spray in direct injection diesel engine with optical access
The simultaneous application of methods of laser induced scattering and laser induced incandescence, that o
f two-color method and the measurement of the natural emission of OH radicalas the representative of chemical species were carried out in the objective flame generating in a direct injection diesel engine with the optical access to detect distributions of soot, OH radical and flame temperature. The following main conclusions are drawn :
(1)The mean relative soot diameter increases as the passage of the time during the period of diffusion burning.
(2) The mean relative soot number density has the peak when combustion turns from the pre-mixed burning to the diffusion burning.
(3)In the central region of the combustion chamber a great deal of soots with small diameter produce by the pre-mixed burning.
(4)The first appearance of the natural emission of OHI radical is later than that of soot.
3)Combustion analysis of unsteady diffusion flame of spray in in-direct injection diesel engine with optical access
The distribution of the natural emission of OH radical and those of soot and flame temperature by means of the two-color method were measured in the obj ective flame. The following main conclusions are obtained :
(1)The counter clock wise flow appears in the swirl chamber during the initial combustion stage.
(2)The flame temperature is low near the passage way between both swirl and main chambers during the middle combustion stage.
(3)The natural emission of OH radical breaks out near the passage way and the flame tip region. Less