IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 14, Issue 2 Ver. IV (Mar. - Apr. 2017), PP 41-51 www.iosrjournals.org DOI: 10.9790/1684-1402044151 www.iosrjournals.org 41 | Page Combustion Analysis of CI Engine under the Influence of two different Injecting Nozzles Devangkumar C Patel 1 , Dr. Tushar M Patel 2 , Prof. Dhananjay H Joshi 3 , Prof. Gaurav P Rathod 4 1 (M.E. Scholar, Mechanical Engineering Department, LDRP-ITR, Gandhinagar, India.) 2 (Professor, Mechanical Engineering Department, LDRP-ITR, Gandhinagar, India.) 3 (Assistant Professor, Mechanical Engineering Department, LDRP-ITR, Gandhinagar, India.) 4 (Lecturer, Mechanical Engineering Department, Government Polytechnic, Godhra, India) Abstract: The combustion process taking place inside the engine cannot be directly visualized for the analysis purpose but the same can be possible by performing the experiment and listing the data into graphical form and by the curves of graphs we can conclude the main core of the experiment. Generally combustion is divided into three major parts pressure-crank angle study, pressure-volume study & fuel-line pressure. This paper includes the study of combustion of CI engine when it is experimented by two different types of nozzles. The study gives a brief idea of the amount of pressure and volume attained inside the combustion chamber of CI engine. Keywords: CI engine, Combustion analysis, pressure, volume, fuel line, nozzle I. Introduction The combustion taking place inside the engine cylinder is heterogeneous form. The CI engine is having higher thermal efficiency as compared to SI engine. The Thermal efficiency thus depends on the combustion taking place inside the engine cylinder. This paper gives the general idea about the pressure and volume at the respective crank angle. When the combustion is taking place inside the engine cylinder the pressure rises at maximum level near its combustion phenomenon. This rate of rise in pressure is predicted in the pressure-crank angle study by the graphical method [10]. This study also gives the general idea of the change in the volume created by the piston movement inside the cylinder. The exact volume at the respective crank angle along with the rate of pressure is depicted on the pressure-volume study by the graphical method. When the piston moves from TDC to BDC during the suction stroke the volume of combustion chamber increases thereafter when the piston moves from BDC to TDC for the compression stoke the volume is reduced, then after the completion of compression stoke the piston moves from TDC to BDC for the power stoke and during that time the volume increases rapidly and at last at the time of removal of exhaust gases the volume is again reduced to its minimum level by travel of piston from BDC to TDC [3, 5]. The pressure inside the fuel line is also an important aspect of study of combustion process. The Fuel line pressure indicated the amount of pressure inside the fuel line at the time of injection of fuel. This study plays an important role when the focus is made on both the nozzles. For both the nozzles the pressure might be different [1]. The amount of pressure inside the fuel line also relates the fuel consumption of the engine. By the overall study of pressure, volume and fuel line pressure the complete combustion analysis is achieved in a most proper and efficient manner [2]. The Pressure and volume of combustion differs from time to time due to the continuous movement of the piston inside the engine cylinder [4, 8]. The graph also shows the start of combustion and the start of injection of fuel inside the engine. This study helps to get the general working of the engine itself and also the engine with respect to the nozzles. This Study is further helpful for the design purpose for designing the cylinder of combustion chamber. The inappropriate design may leads to the explosive accidents during the working conditions. The proper material selection phase is also done by this analysis [6]. II. Experimental Setup The setup consists of single cylinder, four stroke, multi-fuel, research engine connected to eddy type dynamometer for loading and DC five gas analyzer connected measures five emission gases, including Hydrocarbons (HC), Carbon Monoxide (CO), Carbon Dioxide (CO2), Oxygen (O2) and Oxides of Nitrogen (NOX) [11]. The operation mode of the engine can be changed from diesel to Petrol of from Petrol to Diesel with some necessary changes [9]. The specification of the research engine is given in table-3. The operation mode of the engine can be changed from diesel to petrol of from petrol to diesel with some necessary changes. In both modes the compression ration can be varied without stopping the engine and without altering the