MODELING AND ANALYSIS OF DIESEL ENGINE PISTON
1Gantla Shashidhar Reddy and 2 N. Amara Nageswara Rao
1 Department of Mechanical Engineering, Nimra College of Engineering & Technology, Vijayawada. A.P. India-521 456
2 Department of Mechanical Engineering, Nimra College of Engineering & Technology, Vijayawada, A.P. India-521 456
As the emission norms are becoming stringent day by day, the engine manufacturers are concentrating more on reducing the engine emissions like CO, HC, NOx and particulate matter (PM). For the reduction of these above said engine exhaust emissions, combustion system plays very important role. For effective combustion system, various parameters like combustion pressure, compression ratio, proper fuel mixing and ignition timing etc are very important. In this scenario, lot of research has been carried out on arriving at a piston design which can give effective fuel mixing, high compression ratio using a re-entrant combustion bowl shape. Due to high market competition in automotive sector, it has become always important to produce ancillary components for minimum cost at the same time satisfying all the necessary requirements. So there is a need for the piston design which can give all the above said capabilities. At the same time, it should be light weight, low cost, structurally and thermally withstandable at very high pressure and temperature conditions that will occur in the combustion process. In this way, there is a lot of demand for understanding the process of evaluation of piston geometry for various loading conditions like thermal, mechanical and inertial loads.
In this Project, it has been decided to study a particular piston design and its capability for various above said loads. In this work, initially planning to make a piston model using solid modeling software Pro-E. It has been decided to mesh the geometry and analyze using commercially available software tool ANSYS. For the analysis input conditions and process of analysis, lot of literature survey has been done. Initially, thermal analysis of the piston will be carried out to predict the temperature distribution of the piston. For thermal analysis of piston, basic necessary thermal boundary conditions like bulk gas temperatures and heat transfer coefficients have been obtained from literature survey. Temperature of the piston due to its working in high combustion environment will itself act as thermal load causing stress to the component. High combustion gas pressures will act as a mechanical loads and cause major stresses in the critical features of the piston. Once after thermal analysis of the piston, for judging the critical features of the piston geometry, a detailed structural analysis will be carried out for various loading conditions like thermal load and mechanical load. After assessing the piston for various loads, it has been decided to calculate the factor of safety for the piston using Soderberg’s criterion.
KEYWORDS: Combustion Systems, Piston, ANSYS, Thermal Analysis, Gas Temperature, Thermal Load, Mechanical loads, Structural Analysis.
International eJournal of Mathematics and Engineering
Volume 4, Issue 2, Pages: 1994 - 2027