喷流冷却复合陶瓷薄片激光器的热特性仿真分析及实验研究

为分析喷流冷却复合陶瓷薄片激光器的热特性,设计用于冷却复合陶瓷薄片的喷流冷却系统.利用湍流换热理论和计算流体动力学仿真方法建立喷流冷却复合陶瓷薄片激光器的流固耦合热仿真模型,定义评价其冷却能力和冷却均匀性的定量参数.根据该仿真模型得到喷流冷却系统的最优设计参数,并进行实验验证.使用163孔喷板,流量为0.2kg/s,入口温度为20℃,在1200 W泵浦时获得359 W激光输出功率,并测得复合陶瓷薄片上表面的最高温度为92℃.激光输出功率与复合陶瓷薄片上表面温度均与泵浦功率呈近似正线性关系,且温度的实验值与仿真值相符度较高.

Simulation and Experiment of Thermal Characteristics of a Jet Cooling Composite Ceramic Thin-disk Laser

In order to analyze the thermal characteristics of a jet cooling thin-disk composite ceramic laser,the jet cooling device for a composite ceramic thin-disk laser is designed.A systematic simulation model is developed by using the turbulent heat transfer theory and computational fluid dynamics method.Two evaluation parameters are defined for the cooling capacity and uniformity of the designed jet cooling device.The optimal parameters of the jet cooling device are obtained by using the simulation model,and a verification experiment is carried out afterward.In the experiment,ajet plate with 163 holes is adopted,the inlet coolant flow rate and temperature are set to be 0.2 kg/s and 20 ℃,respectively.When the pump power is raised to 1 200 W,the output power of 359 W has been achieved,and the maximal temperature on the upper surface of the thin-disk composite ceramic detected by a thermal camera has reached to 92 ℃.It is also demonstrated that there have been approximate positive linear relationships between the pump power and both the output power and the temperature on the upper surface of the thin-disk of composite ceramic,and the experimental temperature value shows good agreement with simulated value.