Numerical simulation of the flow field of a flat torque converter

A flexible flat torque converter was proposed to fulfill the requirement of miniaturization and power density maximization for automobiles.Constructed by two arcs joined by lines,the torus was designed directly from design path.The influence of flatness on the performance of the torque converter was evaluated.The software CFX and standard k-ε model were adopted to simulate the internal flow fields of the torque converter under different flatness ratios.The results indicated that the performance of the torque converter got worse as the flatness declined,but the capacity of pump increased.The efficiency and the torque ratio dropped slightly as the flatness ratio decreased.So the torque converter could be squashed appropriately to get high power density without too much efficiency sacrifice.But when the flatness ratio was below 0.2,there was a significant drop in the efficiency.

电炉转炉化冶炼工艺生产实践

介绍了国内某钢厂采用电炉转炉化工艺炼钢的生产实践。分别对热装铁水比例在70%和85%的炉次,从通电时间、冶炼周期、脱碳速度、炉渣成分、终点钢水成分、炉壳和炉盖寿命、原料消耗、电极消耗、能源介质消耗和生产成本等方面进行了对比分析。结果表明,50 t电炉热装铁水比例为85%时实现了非通电冶炼,验证了电炉转炉化是一种可行的炼钢生产工艺;采用顶部水冷氧枪吹炼工艺,有效缩短了冶炼周期、降低了能耗、节约了成本、提高了钢水质量。