Schlieren, Shadowgraph, Mie-scattering visualization of diesel and gasoline sprays in high pressure/high temperature chamber under GDCI engine low load condition
Three visualization methods, Schlieren, Shadowgraph, and Mie-scattering, were applied to compare diesel and gasoline spray structures in a constant volume chamber. Fuels were injected into a high pressure/high temperature chamber under the same in-cylinder pressure and temperature conditions of low load in a GDCI (gasoline direct injection compression ignition) engine. Two injection pressures (40 MPa and 80 MPa), two ambient pressures (4.2 MPa and 1.7 MPa), and two ambient temperatures (908 K and 677 K) were use. The images from the different methods were overlapped to show liquid and vapor phases more clearly. Vapor developments of the two fuels were similar; however, different liquid developments were seen. At the same injection pressure and ambient temperature, gasoline liquid propagated more quickly and disappeared more rapidly than diesel liquid phase. At the low ambient temperature and pressure condition, gasoline and diesel sprays with higher injection pressures showed longer liquid lengths due to higher spray momentum. At the higher ambient temperature condition, the gasoline liquid length was shorter for the higher injection pressure. Higher volatility of gasoline is the main reason for this shorter liquid length under higher injection pressure and higher ambient temperature conditions. For a design of GDCI engine, it is necessary to understand the higher volatility of gasoline.
KeywordsSpray Gasoline Diesel Mie-scattering Schlieren Shadowgraph
before top dead center
gasoline direct-injection compression ignition
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- Canaan, R. E., Dec, J. E., Green, R. M. and Daly, D. T. (1998). The influence of fuel volatility on the liquidphase fuel penetration in a heavy-duty D.I. diesel engine. SAE Paper No. 980510.Google Scholar
- ECN (Engine Combustion Network) (2015}). http://www.sandia.gov/ecn/cvdata/sandiaCV/ambientConditions.phGoogle Scholar
- Heywood, J. B. (1988). Internal Combustion Engine Fundamentals. McGraw-Hill. Singapore.Google Scholar
- Lai, M., Zheng, Y., Xie, X., Moon, S., Liu, Z., Gao, J., Zhang, X., Fezzaa, K., Wang, J. and Shi, J. (2011). Characterization of the near-field spray and internal flow of single-hole and multi-hole sac nozzles using phase contrast x-ray imaging and CFD. SAE Int. J. Engines 4, 1, 703–719.CrossRefGoogle Scholar
- Montanaro, A., Migliaccio, M., Allocca, L., Fraioli, V., Lee, S., Zhang, A. and Naber, J. (2014). Schlieren and mie scattering visualization for single-hole diesel injector under vaporizing conditions with numerical validationd. SAE Paper No. 2014-01-1406.Google Scholar
- Won, H., Bouet, A., Duffour, F. and De Francqeville, L. (2016). Potential of Naphtha fuel on a light duty single cylinder compression ignition engine. Proc. FISITA 2016, Bexco, Korea.Google Scholar