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This study was performed to. investigate the behavior of liquid and vapor phase of fuel mixtures with different piston cavity diameters in a optically accessible engine. The conventional engine was modified as DI gasoline engine with swirl flow. Fuel was injected into atmospheric nitrogen to prevent quenching phenomenon by oxygen. Injection pressure is 5.1 MPa. Two dimensional spray fluorescence image of vapor phases was acquired to analyze spray behavior and fuel distribution inside of cylinder. Three injection timings were set at BTDC 180˚ , 90˚ and 60˚ . The results obtained are as follows. With a fuel injection timings of BTDC 60˚ , fuel-rich mixture was concentrated in near the cavity center. With a fuel injection timings of BTDC 90˚ , fuel-rich mixture level in the center region was the highest in S-type(d/D = 0.35). With a fuel injection timings of BTDC 180˚ , fuel was not affected in a piston cavity and generally distributed as homogeneous mixture in the cylinder.

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UCI(KEPA) : I410-ECN-0101-2009-556-014000602