International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 04 | Apr-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1878 Analysis of effect of injection pressure on emissions of DI diesel Engine by using STAR-CD Prinson George 1 , Mithun varghese 2 , Nizamudheen c 3 , Muhammed Asif N.P 4 , Prof Sunil Mathew Roy 5 , Prof Biju Cheriyan Abraham 6 1,2,3,4 B-Tech Degree student, Mechanical Engineering, Mar Athanasius College of Engineering, Kothamangalam, Kerala, India 5,6 Assistant Professor, Dept. of Mechanical Engineering, Mar Athanasius college of Engineering, Kothamangalam, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Internal combustion engines, now a day are the best available reliable source of power for all domestic, large scale industrial and transportation applications. The major issues with these engines arise at the efficiency. The major pollutants are Oxides of Nitrogen (NOx), Carbon Monoxide (CO), Soot particles. These are formed due to incomplete combustion of the fuel in combustion chamber of diesel engine. One of the important factors which influence the performance and emission of diesel engine is fuel injection pressure. Emissions can be controlled by different techniques like EGR, changing the injection pressure of fuel into the combustion chamber etc., It is a well-known fact that as the injection pressure of fuel increases, the mass flow rate of fuel will vary for proper mixing of fuel and air in the combustion chamber. In the present work, it is proposed to investigate the effect of variations in injection pressure on emissions and for this, STAR-CD will be used as a tool. Key Words: Diesel Engine, STAR CD, Analysis, Injection Pressure, Caterpillar3401 1.INTRODUCTION Research are being carried out in the field of IC engines for increasing the efficiency. Major issues arise while increasing efficiency of an internal combustion engine are emissions. The major pollutants are oxides of nitrogen(NOx), CO and soot. Injection pressure is one of the important factor which influence the performance and emission of diesel engine. A study on Caterpillar 3401 engine parameters were performed by varying its injection pressure. STAR-CD is used as the software tool for this analysis. It is always economical to find an optimum injection pressure which will increase the combustion efficiency and reduce NOx , CO and soot emission accordingly rather than creating a new engine model. Analyzing the variation of combustion efficiency, NOx, CO and soot emissions for various injection pressures will help to find the optimum injection pressure. 2. COMPUTATIONAL PROCEDURE Modeling of piston bowl geometry was done using Solid- Works. Surface mesh generation done by Prosurf. Then a 60- degree sector mesh was generated in es-ICE (Expert Systems in IC Engine). After this, the sector grid is used as a part of STAR-CONTROL for applying initial conditions, boundary conditions like beginning temperature, initial pressure and cylinder crown temperature and so on. Fig -1: Computational grids at TDC Fig -2: Computational grids at 100degree before TDC This sector grid is further utilized as a part of PRO-STAR for applying the fuel properties and injection parameters like injection temperature, nozzle hole diameter etc. Simulation was started in solver after completion of PRO- STAR. After the results were obtained in es-ICE, injection droplets in cylinder bowl of direct injection diesel engine at different injection pressures (600, 800, 1000, 1200 bar) and 9 degrees before TDC were done.