Abstract
A new diesel combustion system TR (Three-Rapidity) was obtained by modifying a deep cave co combustion chamber with an oriented arc in the middle of chamber wall, combined with a specially and perfectly fitted nozzle with 4 × φ0.36 mm orifices in conic section and a nozzle with 1 × φ0.20 mm orifice in the center. In order to study the air flow and the mixture formation, three-dimensional numerical simulation was made with STAR-CD code. The results show that large hole and high rate of fuel supply by increasing plunger area keep fuel ignition timing near TDC, and the amount of fuel injected after ignition decreases. The oriented arc and centric spray enhance the air flow, making reasonable fuel distribution and sufficient utilization of cylinder air. Heat loss to the chamber wall decreases. The initial design purposes of TR combustion system, that is, rapid fuel injection, rapid mixture formation and combustion, are realized. The cold start performance of the engine is improved.
| Original language | English |
|---|---|
| Pages (from-to) | 263-268 |
| Number of pages | 6 |
| Journal | Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology |
| Volume | 12 |
| Issue number | 3 |
| Publication status | Published - Jun 2006 |
| Externally published | Yes |
Keywords
- Combustion chamber
- Diesel
- Numerical simulation
- Spray
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