激光介质温度场及应力场的流固耦合数值模拟
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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 microchannel structure is established in the present work.Flow,temperature and Nd…YAG crystal slices′s 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.
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 microchannel structure is established in the present work.Flow,temperature and Nd…YAG crystal slices′s 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.
引文
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[13]Yun Heming.Study on flow and heat transfer characteristics of single phase in mini-channels[D].Jinan:Shandong University,2007:39-40.云和明.细通道单相流动和传热特性的研究[D].济南:山东大学,2007:39-40.
[14]Lu Peng.Numerical simulation of fluid-solid coupled heat transfer process in microchannel cooler[D].Dalian:Dalian University of Technology,2014:29-33.卢鹏.微通道冷却器内流固耦合传热过程的数值模拟[D].大连:大连理工大学,2014:29-33.
[15]Pan Y Q,Lu P,Yu L,et al.Numerical simulation of flow characteristic in microchannel between parallel flat plates[J].Applied Mechanics&Materials,2013,423/426:1763-1767.
[16]Yang H,Feng G,Zhou S.Thermal effects in high-power NdYAG disk-type solid state laser[J].Optics and Laser Technology,2011,43(6):1006-1015.
[17]Zhu Hongjun.ANSYS 14.5actual combat guide of the fluid-solid-heat coupling[M].Beijing:Posts&Telecom Press,2014:162-165.朱红钧.ANSYS 14.5热流固耦合实战指南[M].北京:人民邮电出版社,2014:162-165.
[2]Welch D F.A brief history of high-power semiconductor lasers[J].IEEE Journal of Selected Topics in Quantum Electronics,2000,6(6):1470-1477.
[3]Wang Dongliang.Finite element analysis on thermal effect of solid-state laser[D].Changsha:National University of Defense Technology,2006:31-38.王栋梁.固体激光器工作介质热效应的有限元分析[D].长沙:国防科学技术大学,2006:31-38.
[4]Pan Nana,Pan Yanqiu,Yu Lu,et al.Numerical simulation of flow and heat transfer characteristics in microchannel cooler[J].High Power Laser and Particle Beams,2016,28(2):7-12.潘娜娜,潘艳秋,俞路,等.微通道冷却器内流动和传热特性的数值模拟[J].强激光与粒子束,2016,28(2):7-12.
[5]Hou Liqun,Zu Jifeng,Dong Yue,et al.Numerical simulation of thermal induced effects and cooling characteristics of NdGGG laser crystal slabs in the heat capacity operation mode[J].Chinese J Lasers,2006,33(8):1025-1029.侯立群,祖继锋,董玥,等.NdGGG激光晶体热容工作下的热致效应与冷却特性数值模拟[J].中国激光,2006,33(8):1025-1029.
[6]Miao Qingjie,Pan Sunqiang,Liu Bin,et al.Investigation of thermally induced birefringence effect in natural birefringent crystals[J].Acta Optica Sinica,2015,35(6):0626001.苗青杰,潘孙强,刘斌,等.自然双折射晶体中热致双折射效应的研究[J].光学学报,2015,35(6):0626001.
[7]Schepler K L,Peterson R D,Berry P A,et al.Thermal effects in Cr2+ZnSe thin disk lasers[J].IEEE Journal of Selected Topics in Quantum Electronics,2005,11(3):713-720.
[8]Liu Shanchao,Liu Yan,Liu Lei,et al.Research on wave front distortion of liquid cooled side-pumped slab laser[J].Laser&Infrared,2015,45(3):266-270.刘善超,刘洋,刘磊,等.液体冷却大面泵浦板条激光器的波前畸变研究[J].激光与红外,2015,45(3):266-270.
[9]Bavil M B,Safari E.Thermal and stress analyses in an end-pumped NdYAG slab laser using finite element method[J].Journal of Mechanical Science and Technology,2014,28(8):3231-3236.
[10]Hu Hao,Tu Bo,Jiang Jianfeng,et al.Numerical simulation of thermodynamics in laser medium for heat capacity laser[J].High Power Laser and Particle Beams,2005,17(S0):180-184.胡浩,涂波,蒋建锋,等.热容激光器激光介质的热力学数值模拟[J].强激光与粒子束,2005,17(S0):180-184.
[11]Ye Z,Cai Z,Tu B,et al.Numerical approach to temperature and thermal stress in direct-liquid-cooled NdYAG thin disk laser medium[C].SPIE,2014,9255:92550T.
[12]Yang Huomu,Feng Guoying,Wei Yongtao,et al.Study on temperature distribution of disk-type laser based on heatfluid-solid multiphysics coupling method[J].Chinese J Lasers,2013,40(9):0902004.杨火木,冯国英,魏泳涛,等.基于热-流-固多物理场耦合的薄片激光器温度场研究[J].中国激光,2013,40(9):0902004.
[13]Yun Heming.Study on flow and heat transfer characteristics of single phase in mini-channels[D].Jinan:Shandong University,2007:39-40.云和明.细通道单相流动和传热特性的研究[D].济南:山东大学,2007:39-40.
[14]Lu Peng.Numerical simulation of fluid-solid coupled heat transfer process in microchannel cooler[D].Dalian:Dalian University of Technology,2014:29-33.卢鹏.微通道冷却器内流固耦合传热过程的数值模拟[D].大连:大连理工大学,2014:29-33.
[15]Pan Y Q,Lu P,Yu L,et al.Numerical simulation of flow characteristic in microchannel between parallel flat plates[J].Applied Mechanics&Materials,2013,423/426:1763-1767.
[16]Yang H,Feng G,Zhou S.Thermal effects in high-power NdYAG disk-type solid state laser[J].Optics and Laser Technology,2011,43(6):1006-1015.
[17]Zhu Hongjun.ANSYS 14.5actual combat guide of the fluid-solid-heat coupling[M].Beijing:Posts&Telecom Press,2014:162-165.朱红钧.ANSYS 14.5热流固耦合实战指南[M].北京:人民邮电出版社,2014:162-165.