Major Technical issues and their measures for achieving brake thermal efficiency of 55% with heavy-duty diesel engines
大型ディーゼルエンジンにおける正味熱効率 55%の実現への主要な技術課題とその解法
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20214806
- Paper/Info type
- Symposium Text
- Pages
- 1-6(Total 6 p)
- Date of publication
- Dec 2021
- Publisher
- JSAE & JSME
- Language
- Japanese
Detailed Information
| Author(J) | 1) 内田 登, 2) 渡邉 一雅, 3) 河原塚 史裕 |
|---|---|
| Author(E) | 1) Noboru Uchida, 2) Kazumasa Watanabe, 3) Fumihiro Kawaharazuka |
| Affiliation(J) | 1) (株)新エィシーイー, 2) (株)新エィシーイー, 3) (株)新エィシーイー |
| Affiliation(E) | 1) New A.C.E Institute CO.,LTD, 2) New A.C.E Institute CO.,LTD, 3) New A.C.E Institute CO.,LTD |
| Abstract(J) | 大型ディーゼルエンジンにて正味熱効率55％を実現するために必要な用技術の考え方とその目標値について，著者らが新たに考案したチャートを用いて説明する．熱効率改善に向けた基本的な方向性と主な技術的課題は，高圧縮比化に伴う壁面冷却損失の増加，混合気形成の悪化，および最適化されていない熱発生率による損失の増大である．これらを解決する技術と，単気筒エンジンを用いて得られた組み合わせ効果について報告する． Translation |
| Abstract(E) | This study focused on the technology integration to aim beyond 60% indicated thermal efficiency (ITE) with a single- cylinder heavy-duty diesel engine as an alternative to achieve 55% brake thermal efficiency (BTE) with multiple-cylinder engines. Technology assessment was initially carried out by means of a novel chart showing ITE and exhaust heat loss as the functions of cooling loss and heat conversion efficiency into indicated work. Apart from the peak cylinder pressure constraint, the technical barriers for further ITE improvement with higher compression ratio are mainly laid in cooling loss, fuel-air mixture formation, and heat release rate profile under very high temperature and density conditions. Although the engine has not been fully optimized yet, ITE of 59.5% was experimentally achieved with the single cylinder engine by utilizing these technologies without any significant drawbacks. |
