圆形喷嘴内部结构对射流冲击换热性能的影响

研究了内部结构分别为柱状和锥状喷嘴的射流冲击换热性能.在初始条件和边界条件相同的情况下，利用计算流体力学软件Fluent对两种喷嘴的冲击换热过程进行了热流耦合模拟.对流固交界面的压力、剪切力、湍流强度、对流换热系数等流场和温度场数据进行对比分析.模拟结果表明，锥状结构喷嘴的射流冲击换热性能明显优于柱状结构的喷嘴.所得结论对热轧钢超快速冷却设备喷嘴的设计具有指导意义.

Influence of Internal Structure of Round Jet Nozzle on Heat Transfer Performance

The impingement heat transfer performance of jets from conical and cylindrical nozzles was studied. Under the same initial and boundary conditions， the simulations of coupled heat transfer and fluid flow in the impingement heat transfer process of the two nozzles were conducted by using computational fluid dynamics software Fluent. The fluid flow and temperature field data at the fluid-solid interface， such as static pressure， shear stress， turbulence intensity， convection heat transfer coefficient， were compared and analyzed. The simulation results show that the heat transfer performance of jet from conical nozzle is better than that from cylindrical nozzle. The conclusions obtained are of guiding significance to the design of nozzles for ultra fast cooling equipment of hot rolled steel.