Analysis of Wall Impingement Spray and Film Formation Process in Direct Injection SI Engines under Low Temperature Conditions (Third Report)
低温環境下における直噴ガソリンエンジン用噴霧の壁面衝突と液膜形成過程の解明（第3報）
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- Publication code
- 20234369
- Paper/Info type
- JSAE Transaction
Vol.54 No.4
- Pages
- 711-717(Total 7 p)
- Date of publication
- Jul 2023
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | 論文 Translation |
|---|---|
| Category(E) | Paper |
| Author(J) | 1) 安達 晃, 2) 松田 大, 3) 前川 楓馬, 4) 松村 恵理子, 5) 千田 二郎, 6) 大隈 正寛 |
| Author(E) | 1) Akira Adachi, 2) Dai Matsuda, 3) Fuma Maekawa, 4) Eriko Matsumura, 5) Jiro Senda, 6) Masahiro Okuma |
| Affiliation(J) | 1) 同志社大学大学院, 2) 同志社大学大学院, 3) 同志社大学大学院, 4) 同志社大学, 5) 同志社大学, 6) デンソー |
| Abstract(J) | 本研究では噴霧‐壁面間干渉による液膜形成過程を考察するため，壁面衝突距離および壁面温度をパラメータとして壁面衝突噴霧による液膜の付着量，付着面積ならびに液膜温度の解析を行った．そし，実機関を想定し雰囲気から液膜に与えられる熱移動量，液膜の蒸発に必要な熱量を算出しPM排出過程に関する考察を行った． Translation |
| Abstract(E) | In direct injection spark ignition (DISI) engines, strict control of pollutant emissions at cold start is required to comply with new emission regulations. To clarify the effect of the impingement distance between the nozzle and the wall on the film formation process under low temperature conditions and the relationship between heat transfer and evaporation characteristics of the fuel film in an actual engine, total internal reflection laser induced fluorescence (TIR-LIF) method was applied to visualize the fuel film formation process. The parameters are 14mm, 28mm, 42mm, and 57 mm in wall impingement distance and the wall surface temperatures are 253 K and 293 K. As a result, the wall impingement distance increases, the momentum of the spray droplets just before impingement on the wall is smaller and it follows the gas flow in the spray more easily, resulting in a decrease in the amount of fuel adhesion on the wall. At a wall impingement distance of 14 mm, the amount of dispersion from the fuel film increases due to the large momentum of the spray droplets. In DISI engines, the fuel film easily residual in the intake process due to the reduction of heat transfer from gas to liquid and increase in heat require for evaporation of the fuel film at the earlier injection timing. |
