Use of narrow angle split injection strategy for improving the Performance of a biogas diesel RCCI Engine
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20229081
- Paper/Info type
- SETC
No.2022-32-0081
- Pages
- 1-13(Total 13 p)
- Date of publication
- Oct 2022
- Publisher
- JSAE
- Language
- English
- Event
- SETC2022
Detailed Information
| Author(E) | 1) Anirudh Koya, 2) Gopa Kumar S, 3) A. Ramesh |
|---|---|
| Affiliation(E) | 1) Internal Combustion Engines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, India, 2) Internal Combustion Engines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, India, 3) Internal Combustion Engines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, India |
| Abstract(E) | Low temperature combustion technologies like RCCI are gaining popularity because of their potential for good performance while promoting the use of renewable energy sources. Conventionally in a biogas diesel RCCI engine biogas is inducted and compressed along with air while diesel is injected very early in the compression stroke. The early injection of diesel using the conventional wide angle fuel injector that is suitable for conventional diesel combustion leads to wall wetting and hence elevates the HC emissions and also lowers the efficiency. The present work is an attempt to address these issues with the use of a narrow angle injector for the biogas diesel RCCI mode of operation. The conventional Wide angle injector which is located at the center of the combustion chamber needs to be retained because the engine has to be operated in the conventional mode at low and high loads. Thus, the Narrow angle injector is an additional injector which has to be located at the available space in an offset manner from the Wide injector. The role of the Narrow angle injector is to ensure that the fuel hits the piston surface rather than the liner during early injections in the RCCI mode. A CFD model of the engine that was validated using experimental data was used for the parametric studies reported in this work. The Narrow injector has been first located and oriented in the combustion geometry based on the space constraints in the cylinder head. The number of holes in the injector were fixed as three and their orientations were then determined based on the simulations taking into consideration the benefits of spray targeting. The importance of spray targeting the piston bowl periphery was first established by a comparative study. Two injectors with different spray angles were then designed based on two chosen injection timings namely 900 bTDC and 700 bTDC and their performances were compared to select the better configuration. A timing sweep was done to analyze the performance of each of the injectors based on fuel vaporization, film mass and the homogeneity of the mixture at different injection timings. It was found that the injector designed for SOI-900 bTDC gave the best results. The performance of the chosen Narrow injector was then compared against that of the wide angle injector and the potential for a significant improvement in efficiency was observed. However, this was at the cost of high NOx and HC emissions. In order to reduce the emissions, split injection strategy was then considered with the Narrow angle injector. The results showed further improvement, but the emission values were still higher than that of wide angle injection. Thus, the use of Narrow angle injector is beneficial in improving the efficiency of an RCCI engine. However, steps need to be taken to reduce the NOx and HC emissions. |
