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Numerical Optimization of the Fuel Mixing Process in a Direct-Injection Gasoline Engine
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English
Abstract
The spray formation and mixing processes in a direct-injection gasoline engine are examined by using a sophisticated air flow calculation model and an original spray model. The spray model for a spiral injector can evaluate the droplet size and spatial distribution under a wide range of parameters such as the initial cone angle, back pressure and injection pressure. This model also includes the droplet breakup process due to wall impingement. The arbitrary constants used in the spray model are derived theoretically without using any experimental data. Fuel vapor distributions just before ignition and combustion processes are analyzed for both homogeneous and stratified charge conditions.
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Citation
Naitoh, K., Takagi, Y., and Kuwahara, K., "Numerical Optimization of the Fuel Mixing Process in a Direct-Injection Gasoline Engine," SAE Technical Paper 981440, 1998, https://doi.org/10.4271/981440.Also In
References
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- Naitoh K. Kuwahara K. Large eddy simulation and direct simulation of compressible turbulence and combusting flows in engines based on the BI-SCALES method Journal of Fluid Dynamics Research 10 1992
- Naitoh K. et al. Numerical prediction of fuel secondary atomization behavior in SI engine based on the Oval-Parabola Trajectories (OPT) model Trans of SAE Paper 940526 1994
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- Iwano H. et al. SAE Paper 912348 1991