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Title: | Investigation of Split Diesel Injections in Methanol/Diesel Dual-Fuel Combustion in an Optical Engine |
Authors: | Zhang, H Zhao, Z Wu, J Wang, X Ouyang, W Wang, Z |
Keywords: | optical engine;diesel/methanol;methanol energy ratio;main injection timing;combustion process |
Issue Date: | 10-Jul-2024 |
Publisher: | MDPI |
Citation: | Zhang, H. et al. (2024) 'Investigation of Split Diesel Injections in Methanol/Diesel Dual-Fuel Combustion in an Optical Engine', Energies, 2024, 17 (14), 3382, pp. 1 - 21. doi: 10.3390/en17143382. |
Abstract: | Methanol is a promising alternative fuel due to its wide availability of raw materials, mature production processes, and low production cost. However, because of the low cetane number, methanol must include a more reactive fuel to assist with combustion when used in compression ignition (CI) engines. In this study, based on the optical CI engine platform, methanol is injected into the intake port, and diesel is directly injected into the cylinder to achieve dual-fuel combustion. The effects of the methanol energy ratios and diesel split injection strategies on combustion are investigated. The results show that the premixed blue flame was mainly concentrated in the near wall region, whereas the yellow flame produced by diesel combustion tended to concentrate in the central region as the methanol energy ratio increased. When the methanol energy ratio exceeded 50%, the ignition delay was significantly prolonged, while the flame area was greatly reduced. Meanwhile, the peak values for the cylinder pressure and heat release rate decreased significantly, indicating a significant deterioration in combustion. At the earlier diesel pre-injection timing at −58°, the overall dual-fuel combustion at each main injection timing exhibited low-temperature premixed combustion characteristics, with a lower peak exothermic rate and flame brightness. At the later pre-injection timing at −33°, the spray flame at all main injection timings could be observed, with higher peak heat release rates and indications of thermal efficiency. Combustion at later main injection timings was characterized by diffusion combustion, and the main injection timing could effectively regulate the combustion process through phase adjustment. |
Description: | Data Availability Statement: The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author. |
URI: | https://bura.brunel.ac.uk/handle/2438/29671 |
DOI: | https://doi.org/10.3390/en17143382 |
Other Identifiers: | ORCiD: Zhonghui Zhao https://orcid.org/0009-0004-7061-5681 ORCiD: Jun Wu https://orcid.org/0000-0002-8657-5475 ORCiD: Xinyan Wang https://orcid.org/0000-0002-1988-3742 ORCiD: Zhaowen Wang https://orcid.org/0000-0002-1988-3742 3382 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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