Three Dimensional Static Thermal Analysis And Thermal Intensity Calculation Of Piston

Design criteria of PA6/280 some style Diesel is improving single cylinder power from 350 kW to 400 kW. The improving of power can not but add thermal load. Piston is a center part of Diesel so the reasonable design of piston directly relates to the reliability, lifetime and economic performance. Thermal transfer and intensity analysis is done for the piston, and interior temperature field, thermal stress field are acquired. The results offer theoretical references for the destroy problems owing to overheating during the process of solving engineering technology. On this basis we look forward to do some beneficial research on forepart design for the future, thereby reducing blindfold designs and experiment cost.Piston in PA6/280 some style Diesel is combinational construction. So sequence coupling method is used to analyze the temperature and stress field. The model of piston is built in Pro/E software. Three-dimensional static temperature field is obtained through FEA solution. To ascertain the boundary condition of piston crown, a distributed function of thermal-transfer coefficients on piston crown is put forward, which is based on Seal-Taylor Formula and its experiment data. The distributed function is the same with 280 type diesel piston. The temperatures of connecting bolts, distance sleeves and aligning arbor are also analyzed, considering the combinatorial construction of piston. Thermal stress is further solved with the 3D numerical simulation of temperature field. At last the distribution of thermal stress and distortion of piston head, piston body, aligning arbor, connecting bolts and distance sleeves are obtained through coupling analysis for each groupware.Thermal analysis of piston indicates that: (1) The top temperature, 420℃, appears at the combustion chamber throat. Temperature of local part of outer cooling chamber is exorbitant, and it can reach 343℃. The temperature of first ring groove, 140.4℃, is in the allowable range. Temperatures of other parts are also in the allowable range. (2) The max of thermal stress is 355.9Mpa and appears at the combustion chamber and hoisting hole. The max is 355.9Mpa. thermal stress is of other parts is in the allowable range. (3) Shape distortions of...