International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 04 | Apr -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1383 SECOND LAW ANALYSIS OF A DIESEL ENGINE FUELLED WITH DIESEL- ETHANOL BLEND USING DIFFERENT IGNITION DELAY CORRELATIONS GAURAV P CHAUDHARI 1 , M M DESHMUKH 2 1 M.Tech Student, Thermal Engineering, Govt. College of Engineering, Amravati (M.S), India 2 Assossiate. Professor, Department of Mechanical Engineering, Govt. College of Engineering, Amravati (M.S), India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - A mathematical model is developed by using different ignition delay models for compression ignition engine fuelled with the diesel-ethanol blend under different blend percentages. Modeling activities can make major contributions to engine engineering at different levels of generality or detail, corresponding to different stages of model development. The modeling of engine processes continues to develop as our basic understanding of the physics and chemistry of the phenomena of interest steadily expands.The model developed is single zone zero dimensional model. Once the heat release rate is modelled the pressure and temperature are predicted for every crank position. The diesel engine is considered as closed system for thermodynamics analysis. The cylinder gases are assumed as ideal gas.The different developed ignition delay model is validated against the data obtained by experimentation at laboratory. This study again elaborated how properties of cylinder charge gases varying with the crank angle position. By performing the experimentation on diesel engine, experimental results have been used with models given by Arrhenious, Wolfer, Watson and Hardenberg. At Last the different availabilities of engine cylinder at varying blend percentages and at constant speed are calculated.It is found that out of total fuel availability supplied, the 40-45% availability is linked with work availability and remaining is the availability loss in the heat transfer and irreversibilities generated during the combustion. As the blend percentages goes on increasing the combustion irreversibilities reduces and heat transfer loss is increased. Key Words: Second Law Analysis, Ignition Delay, Diesel Engine Modelling , Diesel-Ethanol Blend, Availability, Irreversibility, Heat Release Rate, Pressure Prediction. 1.INTRODUCTION The use of second law analysis is not necessarily intended for general performance computations but for understanding the details of the overall thermodynamics of engine operations. The second law of thermodynamics is a powerful statement of related physical observations that has a wide range of implications with respect to engineering design and operation of thermal systems. The second law can be used to determine the direction of process, establish the condition of equilibrium, to specify the maximum possible performance of thermal systems and identify those aspects of processes that are significant to overall performance The second-law analysis provides a more critical and thorough insight into the engine processes by defining the term of availability destruction or irreversibilities and assigning different magnitude to the exhaust gases and heat losses terms. By so doing, it spots specific engine processes and parameters, which can improve the engine performance by affecting engine or subsystems irreversibilities and the availability terms associated with the exhaust gases (to ambient) and heat losses to the cylinder walls. Most of the analyses so far have focused on the dominant combustion irreversibilities term. It was shown that combustion duration, heat release shape, i.e. premixed burning fraction, and injection timing only marginally affect combustion irreversibilities ȋalthough the latterǯs impact on work, heat transfer and exhaust gases availability is significant), the combustion irreversibility production rate is a function of fuel reaction rate only, and also an increasing pre-chamber volume increases the amount of total combustion irreversibilities [9]. Second-law application to internal combustion engines are mainly applied for:  To weigh the various processes and devices, calculating the ability of each one of these to produce work  To identify those processes in which destruction or loss of availability occurs and to detect the sources for these destructions.  To quantify the various losses and destructions.  To analyze the effect of various design and thermodynamic parameters on the exergy destruction and losses.  To propose measures/techniques for the minimization of destruction and losses, to increase overall efficiency.  To propose the methods for exploitation of losses most notably exhaust gas to ambient and heat transfer to cylinder walls now lost or ignored.  To define efficiencies so that different applications can be studied and compared, and possible improvement measured.