Optimal study on parameters of rotational molding process heated electrically for making liner of hydrogen cylinder
On basis of the static bed model,a heat transfer model was established for the rotational molding process heat-ed electrically by a control mode of PID to make the liner of a hydrogen cylinder.The temperatures at the mold surface and inside mold,heating time,and electrical energy were simulated by means of the FLUENT software.These simulat-ed results were in good agreement with the experimental results,indicated that the heat transfer model established in this study was validated.The heat transfer model was then applied to calculate the temperature inside the mold when the heat-ing was stopped,heating time,and electrical energy in 16 cases.A grey relational analysis was conducted to investigate the trigger temperature of the PID mode and the percentage of initial heating power affecting heating time and electrical energy.The results indicated that temperature inside mold after stopping the heating varied with the percentage of initial heating power slightly,and however,it decreased with an increase in the trigger temperature.Both heating time and elec-trical energy decreased as the trigger temperature increased.The optimal process parameters were determined to be a trigger temperature of 250℃and an initial heating power percentage of 90%.In addition,the affecting extent of trigger temperature on heating time and electrical energy was larger than that of the percentage of initial heating power.
electrical heatingrotational molding processheat transfer modelliner of hydrogen cylinderFLUENT simulationgrey relational analysis
国家科技期刊平台
NSTL
万方数据
维普
