3th WCSET-2014 at Nepal

 

Mechanical Engineering / Sustainable Energy Session:

Title:            Combustion analysis of a dual fuel Diesel engine using a Two-zone model
Authors:       Krishna Murthy, Shrinivasa Rao B. R., Vijay G. S., Madhwesh N.
Abstract:     The steady increases in market price, scarcity of diesel fuel and high levels of pollution by diesel engines have compelled their manufactures to look for alternative fuels for their engines. Dual-fuel engine is one such alternative where a gaseous fuel can be used along with a small amount of liquid fuel without incorporating major design changes in the existing engine. Such dual-fuel engines exhibit almost similar, sometimes superior performance characteristics and substantial reduction in smoke emissions compared to the base-line diesel engines. In the present study the combustion analysis of a dual-fuel engine has been carried out by developing a two-zone combustion model. The heat release was obtained by using the double Wiebe’s function separately for the gaseous fuel and the injected diesel fuel. The analysis was carried out only for the closed part of the thermodynamic cycle of the engine. The compression process was analyzed using a single-zone model and the results of this model were used as input for the combustion model. The energy balance was carried out at each time step by considering the interaction between the two zones as open systems. The energy balance for the two zones along with the volume constraint at each time step gave three equations which were solved using the Genetic Algorithm (GA) to obtain the in-cylinder pressure, the un-burnt gas temperature, the burnt gas temperature and the mole fractions. The mole fractions of eleven products of combustion required for energy balance were obtained using the Olikera model. The developed two-zone combustion simulation model was able to predict the in-cylinder pressure which was validated using experimental results.

Keywords:   Dual fuel engine, alternative fuel, two zone model, Genetic Algorithm, in-cylinder pressure, Open system.
Pages:          378-383

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