Compression Ratio and Intake Air Temperature Effect on the Fuel Flexibility of Compression Ignition Engine
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CR and IT Effect on Fuel Flex - Final.pdf
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2.859Mb
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Accepted Manuscript
Type
Conference PaperKAUST Department
Clean Combustion Research CenterMechanical Engineering
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2019-09-09Embargo End Date
2020-03-10Permanent link to this record
http://hdl.handle.net/10754/661322
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The effect of compression ratio (CR) and intake air temperature on the combustion characteristics of fuels with different octane ratings were investigated on a single-cylinder heavy duty engine. The study focused on Primary Reference Fuels (PRFs) and commercial grade diesel with octane numbers ranging from 0 to 100. The engine was configured at a CR of 11.5:1, which is lower than typical heavy-duty compression ignition CI engines. This aims to compare the fuels' burning regime with recently reported measurements at CR17:1. Experiments were performed at different intake air temperatures of 20 to 80 °C and net indicated mean effective pressure (IMEPNet) of 5 to 20 bar. The injection rates have been characterized to determine the hydraulic delay of the injector and thus define the actual ignition delay time. At low loads, diesel-like fuels were found to burn in partially premixed combustion (PPC) mode whereas high octane fuels did not ignite. At high loads, fuels combustion becomes diffusion driven regardless of their RON or MON values. The effect of intake air temperature on the combustion characteristics depended on the combination of the octane ratings and the engine load. At high loads, fuels with low octane numbers were insensitive to the change of the intake air temperature. The ignition delay time was short enough to maintain a diffusion driven combustion. At lower loads, it is more challenging to reach conditions where the combustion characteristics are invariant regardless of the fuel's RON and MON values (Fuel Flexible). At the low tested compression ratio of 11.5:1, the extent of fuel flexibility is limited to only high loads (IMEPNet = 20 bar) whereas it is extended to intermediate loads (IMEPNet = 10 and 15 bar) at CR17:1.Citation
AlRamadan, A. S., Ben Houidi, M., Aljohani, B. S. E., Eid, H., & Johansson, B. (2019). Compression Ratio and Intake Air Temperature Effect on the Fuel Flexibility of Compression Ignition Engine. SAE Technical Paper Series. doi:10.4271/2019-24-0110Publisher
SAE InternationalConference/Event name
SAE 14th International Conference on Engines and Vehicles, ICE 2019Additional Links
https://www.sae.org/content/2019-24-0110/ae974a485f413a2113503eed53cd6c53
10.4271/2019-24-0110