Performance and Emission Diesel Engine Using Diesel-Normal Heptane Volatility Fuel

Conventional diesel engine have a problem with exhaust gas emission where there is a trade of NOx and soot formation inhibits with emission regulation. For this problem, this paper explores the effect of volatility of fuel in on performance and emission in diesel engine. Diesel fuel was blended with N heptane as a volatility fuel into different massbased fraction (0%, 20 %, 40%, 60%, 80%). Thermodynamic Boost AVL simulation software under two engine load condition (10 Nm and 50 Nm) were simulated at 2200 rpm. The model of the engine using Yanmar TF 155 with 102 x 105 bore and stroke with 17,8 compression ratios. The start of combustion was fixed at 5°CA BTDC with 80-degree combustion duration for all test cases. Pressure in the combustion chamber shows a decrease of up to 15 percent for loads between 10 Nm to 50 Nm loads. The addition of volatility of the fuel indicates the atomization of the fuel and the process of mixing the fuel changes during the ignition delay process. Rate of heat release shows a decrease of up to 7 percent for loads between 10 Nm to 50 Nm loads. In the case of the volatility fuel of diesel/normal heptane, the rate of heat release (ROHR) shows that the higher volatility produced lower and faster than a mixture with less volatility. The high-volatility fuel has effect on NOx and soot emissions. At 10 Nm load and 80% Normal Heptane, the NOx concentration decreased 40 %. While running under 50 Nm load and 80% of Normal Heptane, the NOx concentration decreased 14 %. This is a advantaged of replacing the volatility fuel-air mixture causing a reduction in the heating value of air and fuel. Raising the load increases soot concentration.