一种双漩涡流场强烈淬火槽的设计及流热耦合仿真

针对缺少均匀高速稳定流场强烈淬火设备的问题,设计了一种双漩涡流场强烈淬火设备淬火槽物理模型,采用Fluent软件,进行流体的力学分析,对强烈淬火设备的淬火槽内部流场进行了研究,基于三维雷诺平均守恒N-S方程和标准k-ε湍流模型对淬火槽内部流体产生的流场进行了数值计算,分析了淬火槽进水口在3.0、3.5、4.0 m/s 的进水速度下产生的流场数据,对最优淬火槽进行流热耦合分析,研究了45号钢试件在该淬火槽下的温度场。结果表明:液相介质流在淬火槽内形成双漩涡流体,在漩涡相交处可形成环绕工件的、强烈稳定的环流场。在淬火槽进水口流速为4.0 m/s时,得到最优工艺,环流场的流速可达2.0 m/s,此速度使45号钢试件冷却速度达到650 ℃/s,完全符合强烈淬火要求。

Design and fluid-thermal coupling of a strong quenching tank with double vortex flow field

In view of the lack of strong quenching equipment with uniform, high-speed and stable flow field, a physical model of quenching tank of strong quenching equipment with double vortex flow field was designed. The fluid mechanics analysis was carried out by using Fluent software, and the internal flow field of quenching tank of strong quenching equipment was studied. Based on the three-dimensional Reynolds average conservation N-S equation and the standard k-ε turbulence model, the flow field generated in the quenching tank was numerically calculated with the water inlet velocity of 3.0, 3.5, 4.0 m/s. The temperature field for specimen of 0.45% carbon steel in the quenching tank was calculated by the fluid-thermal coupling analysis. The results indicate that the liquid phase medium flow forms a double vortex fluid field in the quenching tank and a circulation field around part forms with high speed and stable flow. For the optimal process, the speed of the circulation field is 2.0 m/s when the water inlet speed is 4.0 m/s. This speed makes the cooling rate of 650 ℃/s for 0.45% carbon steel specimen, which fully meets the requirement of strong quenching.