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Effects of Multiple Injectors on Spray Characteristics and Efficiency in Internal Combustion Engines
Technical Paper
2021-01-0501
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
Language:
English
Abstract
High-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.
Authors
- Cristian David Ávila Jiménez - King Abdullah University of Science & Technology
- Gustav Nyrenstedt - King Abdullah University of Science & Technology
- Harsh Goyal - King Abdullah University of Science & Technology
- Arne Andersson - Volvo Global Truck Tech Powertrain Eng
- Hong G. Im - King Abdullah University of Science & Technology
- Bengt Johansson - King Abdullah University of Science & Technology
Citation
Ávila Jiménez, C., Nyrenstedt, G., Goyal, H., Andersson, A. et al., "Effects of Multiple Injectors on Spray Characteristics and Efficiency in Internal Combustion Engines," SAE Technical Paper 2021-01-0501, 2021, https://doi.org/10.4271/2021-01-0501.Data Sets - Support Documents
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References
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