Effects of Multiple Injectors on Spray Characteristics and Efficiency in Internal Combustion Engines
AuthorsÁvila Jiménez, Cristian David
Im, Hong G.
KAUST DepartmentClean Combustion Research Center
Computational Reacting Flow Laboratory (CRFL)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Embargo End Date2021-10-06
Permanent link to this recordhttp://hdl.handle.net/10754/669095
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AbstractHigh-pressure internal combustion engines promise high efficiency, but a proper injection strategy to minimize heat losses and pollutant emissions remain a challenge. Previous studies have concluded that two injectors, placed at the piston bowl's rim, simultaneously improve the mixing and reduce the heat losses. The two-injector configuration further improves air utilization while keeping hot zones away from the cylinder walls. This study investigates how the two-injector concept delivers even higher efficiency by providing additional control of spray -and injection angles. Three-dimensional Reynolds-averaged Navier-Stokes simulations examined several umbrella angles, spray-to-spray angles, and injection orientations by comparing the two-injector cases with a reference one-injector case. The study focused on heat transfer reduction, where the two-injector approach reduces the heat transfer losses by up to 14.3 % compared to the reference case. Finally, this study connected the two-injector approach to a waste-heat recovery system through GT-Power 1-D simulations, increasing the importance of heat transfer reduction. The final two-injector system then delivered a 54.4% brake thermal efficiency compared to 53% of the one-injector reference case.
CitationÁvila Jiménez, C. D., Nyrenstedt, G., Goyal, H., Andersson, A., Im, H. G., & Johansson, B. (2021). Effects of Multiple Injectors on Spray Characteristics and Efficiency in Internal Combustion Engines. SAE Technical Paper Series. doi:10.4271/2021-01-0501
SponsorsThis work was sponsored by King Abdullah University of Science and Technology (KAUST) and supported by the KAUST Supercomputing Laboratory (KSL). All simulations were performed on KSL's Shaheen-II supercomputer using CONVERGE CFD software. Convergent Science provided CONVERGE licenses and technical support for this work.
Conference/Event nameSAE 2021 WCX Digital Summit