Spray Tip Penetration of Inversed-delta Injection Rate Shaping in Non-Vapourising Condition
| Autor: | Mohd Fareez Edzuan Bin Abdullah, Yoshiaki Toyama, Taizo Shimada, Soshu Saruwatari, Shinobu Akiyama, Tetsuya Aizawa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Thermal efficiency
Materials science 020209 energy Mechanical Engineering 02 engineering and technology Injector Penetration (firestop) Diesel engine law.invention Mercury-vapor lamp 020303 mechanical engineering & transports 0203 mechanical engineering Heat flux Volume (thermodynamics) law Automotive Engineering 0202 electrical engineering electronic engineering information engineering Combustion chamber Composite material |
| Zdroj: | International Journal of Automotive and Mechanical Engineering; Vol 16 No 3 (2019): July-Sept; 7048-7060 |
| ISSN: | 2381-3652 2180-1606 2229-8649 |
| Popis: | The performance and emissions of diesel engine are highly depending on the fuel delivery process thus, injection rate shaping approach is expected to be crucial in the development of a highly efficient and clean modern engine. A novel rate shaping injector called TAIZAC (TAndem Injection Zapping ACtivation) is used to realise an injection rate shaping of progressive ramp-down of high initial injection pressure as in inversed-delta shape. This study aims to investigate diesel spray tip penetration behaviour in inverseddelta injection rate shaping. The experiments are conducted under a high-density nonvapourising condition in a constant volume combustion chamber. High-speed diffused back illumination DBI imaging of the diesel spray is acquired at 30,000 fps using mercury lamp as the light source. The tip penetration of the inversed-delta injection is smaller than that of rectangle injection regardless of their injection momentum which is proportional to t0.5 and t0.43 in rectangle and inversed-delta injection case, respectively. To examine the potential of inversed-delta injection on wall heat loss reduction, diesel spray flame impinges to a MEMS sensor located at 28-mm downstream. It is interesting to note that the heat flux in 200 MPa inversed-delta injection is reduced by approximately 15% compared to 200 MPa rectangle injection even though their tip penetration starts to diverge at approximately 30 mm; indicates the TAIZAC injector potential in improving engine thermal efficiency. |
| Databáze: | OpenAIRE |
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