LES analysis of fluid motion near wall and heat transfer for a diesel spray flame impinging on a wall
ディーゼル噴霧火炎の衝突過程における壁近傍の流動と熱移動の LES 解析
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20214859
- Paper/Info type
- Symposium Text
- Pages
- 1-5(Total 5 p)
- Date of publication
- Dec 2021
- Publisher
- JSAE & JSME
- Language
- Japanese
Detailed Information
| Author(J) | 1) 澤田 明秀, 2) 劉 宇超, 3) 川那辺 洋 |
|---|---|
| Author(E) | 1) Akihide Sawada, 2) Yuchao Liu, 3) Hiroshi Kawanabe |
| Affiliation(J) | 1) 京都大学大学院, 2) 京都大学大学院, 3) 京都大学大学院 |
| Affiliation(E) | 1) Graduate School of Kyoto University, 2) Graduate School of Kyoto University, 3) Graduate School of Kyoto University |
| Abstract(J) | ディーゼル機関のさらなる高効率化を実現するためには，熱損失低減が不可欠である．その低減には噴霧火炎から燃焼室壁面への熱輸送機構の解明が重要な課題となっている．そこで本研究では，ディーゼル噴霧が自着火燃焼するとともに壁面に衝突し，壁面への熱輸送が発生する過程を再現しつつ，壁内の熱伝導と連成したLESベースのCFD解析を行った．これにより壁面近傍の流動構造および壁面性状が熱損失に与える影響を検討する． Translation |
| Abstract(E) | Numerical calculations were carried out in order to investigate the mixture formation, ignition and combustion processes in a diesel spray impinging to wall. The spray formed by injecting n-heptane into a constant-volume vessel under high temperature and pressure is modeled. The fuel droplets were described by discrete droplet model. The flow and turbulent diffusion processes were calculated based on large eddy simulation in order to describe the processes of local non-homogeneous mixture formation and its heat release. Flame structure and heat transfer are also investigated to the wall during the impingement process. Heat transfer of inner wall region is simulated coupling with the gas motion calculation. Results show that heat transfer to the wall becomes larger, especially in the peripheral region around stagnation point because of the high temperature and thin boundary layer. In the outer region, the heat transfer decreases developing as the boundary layer becomes more developed. |
