Study On Diesel Engine Piston Top Structure And Its Impact On The Temperature Field And The Strength

The development of diesel engine technology, is built on the diesel engineimportant parts of continuous performance improvement based on the increase, withimproving the performance of diesel, power and speed,temperature and heat under thepiston diesel engine on the stress increase.As a direct injection diesel engine piston,which in the increasingly harsh environments, so should be a reasonable design ofdiesel engine piston, to reduce these problems. Structure of the piston to temperaturefield and heat on the piston shall have a direct influence on the stress distribution,therefore,it is necessary to predict and evaluate the structure features and performancecharacteristics of piston. The key moving parts and diesel engine piston,continuouslyalternating load it can bear high temperature under high pressure, which is known asthe heart of the diesel engine, especially its application in tanks, ships and militaryvehicles and ships, on the performance of diesel engine piston particularly highrequirements, it has become an important highlight problems to restrict thedevelopment of diesel engine.This topic is mainly a variety of design for a diesel engine piston topstructure,using finite element method, to simulate temperature and pressure pistoncombustion chamber, and then taking these as a condition of loading to the piston, andthe temperature field, thermal structure coupling and fatigue life of piston is analyzed,to determine the piston thermal stress and deformation of large area and the mostdangerous position, in contrast to these results, which reached a design structure isoptimal, is of great significance to improve the properties of piston.The main contents include:1First use of Pro/Engineer composed of piston, cylinder and cylinder head top part(i.e. combustion chamber) for three-dimensional modeling, and then through the ANSYS Workbench on the grid, and finally through the CFX module ANSYSWorkbench in the velocity field, pressure field and temperature field analysis, thecylinder of the results, these results are mainly for the initial conditions of loading tothe piston.2By using Pro/Engineer3D modeling on the piston, the mesh of the model intoANSYS Workbench, and then import the temperature results in1above the cylinder,temperature field analysis of the temperature field distribution, the piston, thedistribution of temperature field of piston thermal structure analysis provides the basisfor the analysis of coupling and fatigue life.3Through the introduction of1,2of the results, the thermal structure coupling andthermal fatigue life analysis of the piston using finite element method, the stress,strainto understand the situation, to find the regional stress and deformation is large, todetermine the most dangerous position of piston, comparing these results, whichreached a design of the structure is the best, to provide a reference for theimprovement of piston design.