Performance Simulation of Diesel Engine Fuelled With Diesel-Diglyme Blend by Using Universal Load Andoxygenate Correction Factors in Wiebe Heat Release Function


One of the proven ways of achieving low emission in diesel engine is oxygenate additive blending with diesel. Diesel-oxygenate blends are reducing gaseous and particulate emissions from diesel engines. However, reducing emissions by oxygenating additives may inflict penalty in the power output due to their energy content lower than that of diesel. Computer simulation of performance of a diesel engine fuelled with diesel and with diesel-oxygenate blend will identify any improvement or decrement in the power output. Such an improvement with identical heat input under identical operating conditions of the engine will decrease emission. Hence, heat release rate of a diesel engine fuelled with diesel-diglyme blend is synthesized by Wiebe function under identical operating conditions relating to base diesel. Limitation of predicting Wiebe efficiency factor with diesel-diglyme blend by trial and error method in the old model is removed. The Wiebe efficiency factor is computed directly without engine specific constant by multiplying the fitted diesel fuel Wiebe factor of all power outputs by the universal oxygenate correction factor in the new model. The universal oxygenate correction factor has been defined earlier as the ratio between the mass flow rate of diesel-oxygenate blend and diesel fuel under identical power output. Performance simulation of direct injection diesel engine fuelled with diesel-oxygenate blend by using the universal oxygenate correction factor is simplified in this paper.

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