Abstract
This paper describes the development of a turbocharged direct-injection compression ignition
(CI) engine model using fluid-dynamic engine simulation codes through a simulating tool known as
GT Power. The model was first fueled with diesel, and then with various blends of biodiesel and diesel
by allotting suitable parameters to predict an optimum blended fuel. During the optimization, main
focus was on the engine performance, combustion, and one of the major regulated gaseous pollutants
known as oxides of nitrogen (NOx). The combustion parameters such as Premix Duration (DP), Main
Duration (DM), Premix Fraction (FP), Main Exponent (EM) and ignition delay (ID) affect the start of
injection (SOI) angle, and thus played significant role in the prediction of optimum blended fuel. The
SOI angle ranging from 5.2 to 5.7 degree crank angle (DCA) measured before top dead center (TDC)
revealed an optimum biodiesel-diesel blend known as B20 (20% biodiesel and 80% diesel by volume).
B20 exhibited the minimum possible NOx emissions, better combustion and acceptable engine
performance. Moreover, experiments were performed to validate the simulated results by fueling the
engine with B20 fuel and operating it on AC electrical dynamometer. Both the experimental and
simulated results were in good agreement revealing maximum deviations of only 3%, 3.4%, 4.2%, and
5.1% for NOx, maximum combustion pressure (MCP), engine brake power (BP), and brake specific
fuel consumption (BSFC), respectively. Meanwhile, a positive correlation was found between MCP
and NOx showing that both the parameters are higher at lower speeds, relative to higher engine
speeds
Asad Naeem Shah, Fiaz H. Shah, Ejaz M. Shahid, Syed Asad Raza Gardezi. (2014) Prediction of an Optimum Biodiesel-Diesel Blended Fuel for Compression Ignition Engine Using GT-Power, Pakistan Journal of Engineering and Applied Sciences, Volume 14, Issue 1.
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