基于CEL法熔滴冲击基板的TPF/FSI数值模拟  

TPF/FSI Numerical Simulation of Droplet Impact Substrate Based on CEL Method

作　　者：陈丽华[1] 张梦娇 闪陆通 李浩群[1] CHEN Lihua;ZHANG Mengjiao;SHAN Lutong;LI Haoqun(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124

出　　处：《北京工业大学学报》2024年第5期523-533,共11页Journal of Beijing University of Technology

基　　金：国家重点研发计划资助项目(2021YFB4001001)。

摘　　要：航空发动机和燃气轮机的高温工作环境会对其热端金属部件造成不可逆损伤,热障涂层(thermal barrier coatings,TBCs)能够承受高温和高压的侵蚀性环境,从而保证金属部件使用的安全性及可靠性。以空心Y_(2)O_(3)-ZrO_(2)(yttrium-stabilized zirconia,YSZ)粒子在等离子焰流中的2种形态,即全熔熔滴和空心熔滴为研究对象对其冲击铺展过程进行了模拟。基于ABAQUS/EXPLICIT耦合欧拉-拉格朗日(coupled Eulerian-Lagrangian,CEL)有限元方法,首先针对ABAQUS缺少相变模型,导致使用CEL方法计算熔滴铺展形貌失真的问题,给出了适用的动力黏度随温度变化的经验公式。此外,考虑周围空气对熔滴铺展过程的影响,提出了“两相流(two phase flow,TPF)/流-固耦合(fluid-structure-interaction,FSI)”2.5D模型,对熔滴冲击基板凝固成型及空气卷入的过程进行了模拟,并揭示了2种熔滴铺展形貌存在较大差异的机理,对制备隔热性能更优的热障涂层具有指导意义。The high temperature working environment of aeroengine and gas turbine will cause irreversible damage to the hot metal parts.Thermal barrier coatings can withstand aggressive conditions of high temperatures and pressures,which ensures safety and reliability in use of metal parts.Two forms of hollow YSZ raw material particles in the plasma flame flow during the preparation of TBCs by plasma spraying process,namely fully molten droplets and hollow droplets are the subjects of this paper.Based on the ABAQUS/EXPLICIT coupled Eulerian-Lagrangian(CEL)finite element method,this paper gave an empirical formula of dynamic viscosity varying with temperature in response to the lack of phase transformation model in CEL method,which causes the distortion of droplet spreading morphology.Besides,considering the influence of air,a 2.5D CEL finite element model of"TPF/FSI"was proposed,the process of solidification and air entrapment of the droplet impacting substrate was simulated,and the mechanism of great difference between the two droplet spreading morphologies was revealed,which has guiding significance for the preparation of TBCs with better thermal insulation performance.

关 键 词：热障涂层 CEL法 TPF/FSI模型 动力黏度经验公式 空心熔滴 孔隙率 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]