In this study, the exhaust characteristics of the diesel engine for the change of the mixing ratio of biodiesel fuel were quantitatively analyzed by using the numerical analysis method. As the fuel used in the experiment, the diesel and biodiesel(waste oil, soybean oil), the mixed fuel BD2(Diesel only), BD3, BD5, BD20, BD50 and BD100 were used. The injection pressure(pinj) was set to 400bar, 600bar, 800bar, 1000bar and 1200bar as the experimental variable. Also the concept of the standard deviation, Pearson’s correlation coefficient and Spearman rank-order correlation coefficient based on the statistics was introduced in order to analyze the exhaust characteristics of the quantitative NOx and Soot according to the injection pressure and the mixing ratio variation of biodiesel blending fuel. It is considered that as a result of studies, for the waste oil, NOx and Soot can be simultaneously reduced through control of the mixing ratio at the regions of pinj=400bar and pinj=600bar, and the Soot can be reduced without affecting on the emission of NOx at more than pinj=800bar. For the soybean oil, NOx and Soot can be simultaneously reduced at pinj=400bar and the Soot can be reduced without affecting on the emission of NOx at pinj=600bar.

The Study of Emission Characteristics of Biodiesel Fuel in Diesel Engines

Comprehensive Effects on Performance and Emission of GDI Gasoline Engine with Electric Supercharger and EGR

{(yj : 2013 2 12 Â 09 j ,  j : 2014 2 02 Â 03 j , $2(E.C : 2014 2 02 Â 04 j ){Abstract: The purpose of this study is to investigate the specific characteristics of combustion and exhaust emissions on a 4-cylinder common rail diesel engine as EGR rate and the rate of blended bio-diesel was altered. Bio-diesel fuel which is a sort of alternative fuels can be adapted to diesel engine directly without modifying. This study was performed to 2000rpm of engine speed with torque 30Nm while EGR rate and the rate of blended bio-diesel was changed. Decreasing combustion pressure and increasing the rate of heat were occurred when we had changed the EGR rate on the 20% of bio-diesel blended diesel fuel. The maximum pressure of combustion and the IMEP became higher as the EGR rate and the rate of blended bio-diesel were changed. Exhaust gas temperature was increased the higher rate of the blended bio-diesel under the fixed EGR rate. However, it went down as the EGR rate increased. The amounts of CO and Soot were reduced with increasing the rate of the blended bio-diesel without changing EGR rate and raised with increasing of the EGR rate. On the fixed EGR rate, NOx was increased along with growing the rate of the bio-diesel. On the other hand, it was decreased while EGR rate were going up.Key Words  Combustion Pressure(ÞzC ) EGR(i.F ), Bio-Diesel(b  ), IMEP( ²E+·I.C ), Rate of Heat Release(âE ) Exhaust Emissions(%* )

Effects of Bio-diesel blending rate on the Combustion and Emission Characteristics in a Common Rail Diesel Engine with EGR rate

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Effects of Bio-diesel blending rate on the Combustion and Emission Characteristics in a Common Rail Diesel Engine with EGR rate