激光介质温度场及应力场的流固耦合数值模拟  

Numerical Simulation on Fluid-Structure Interaction of Temperature and Stress Fields in Laser Medium

作　　者：张威 俞路[1] 刘易航 潘娜娜[1] 贾春燕 刘万发[2] 桑凤亭[2] 潘艳秋[1] 

机构地区：[1]大连理工大学化工与环境生命学部,辽宁大连116024 [2]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《中国激光》2017年第8期1-8,共8页Chinese Journal of Lasers

摘　　要：激光介质的热效应会导致固体激光器在工作过程中产生像差,造成激光光束质量下降,严重影响了固体激光器的发展与应用。以一种固体激光器用微通道双面冷却系统为研究对象,建立其三维物理模型,采用流固耦合方法模拟冷却系统的流场、温度场及介质应力场,并考察了流动雷诺数与Nd…YAG晶体薄片内部热流量对薄片热变形的影响。结果表明,冷却系统内流场对薄片温度场及应力场的影响不可忽略;薄片的最大Von Mises等效应力出现在边缘位置,且随着雷诺数的增大而减小;薄片的热变形因流动状态的变化而存在不同的分布形式;热流量只对薄片热变形的程度有影响,热流量越大,薄片的热变形越大。Heat effect of laser medium can cause the aberration of the laser in the process of operation, resulting in the decrease of the laser beam quality, and seriously affecting the development and application of the solid-laser. A three-dimensional physical model of a double-side fluid cooling system with mierochannel structure is established in the present work. Flow, temperature and Nd： YAG crystal slices% stress fields of the cooling system are simulated, and effects of Reynolds number and heat flux inside crystal slice on thermal deformation of the slice are investigated with fluid-solid coupling method. Results show that the flow field significantly influences temperature and stress fields of the crystal slice. The maximum Von Mises equivalent stress decreases with the increase of the Reynolds number, and its maximum value is located at the edge of the slice. There are different distributions of the thermal deformation under different flow conditions. The heat flux is found to only affect the extent of the thermal deformation, the higher the heat flux, the more obvious the thermal deformation.

关 键 词：激光器 数值模拟 流固耦合 热变形 

分 类 号：TN248.1[电子电信—物理电子学]