Effect of fuel injection timing and pressure on the combustion and spray behavior characteristics of diesel fuel for naval vessel

Title & Authors
Effect of fuel injection timing and pressure on the combustion and spray behavior characteristics of diesel fuel for naval vessel
Lee, Hyung-min;

Abstract
The objective of this work focuses on the analysis of injection rate and macroscopic spray behavior characteristics with injection pressures as well as combustion and exhaust emission characteristics with injection timing and injection pressure by using a common rail single-cylinder diesel engine. The injection rate was measured by applying the Bosch method, and macroscopic spray behavior characteristics were analyzed with a constant-volume vessel and a high-speed camera. In addition, combustion and emission characteristics were analyzed in a common-rail single-cylinder diesel engine with precise control of fuel injection timing and pressure. For injection pressures of 30MPa and 50MPa, the injection rate was higher at 50 MPa, and the spray development (penetration) was also higher in the same elapsed time. The peak in-cylinder pressure and rate of heat release showed a tendency to decline as injection timing was delayed, and the peak in-cylinder pressure and rate of heat release were slightly higher for higher injection pressures. Higher injection pressures also reduced the mean effective pressure, while the indicated mean effective pressure and torque increased as injection timing was delayed to TDC. Nitrogen oxides had a peak level at injection timings of $\small{BTDC20^{\circ}}$(30MPa) and $\small{BTDC15^{\circ}}$(50MPa); carbon monoxide emissions were reduced by delaying injection timing from $\small{BTDC30^{\circ}}$.
Keywords
Injection rate;Macroscopic spray;Indicated mean effect pressure;Carbon monoxide;Nitrogen oxides;
Language
Korean
Cited by
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