吹风比对热障涂层-气膜冷却系统CMAS侵蚀过程及隔热性能的影响  

Effect of Blowing Ratio on CMAS Penetration Behavior and Thermal Insu-lation Performance of Thermal Barrier Coating-Air Film Cooling System

作　　者：张俊红[1,2] 谢安顺 高朗 张学玲 林杰威 戴胡伟[1] Zhang Junhong;Xie Anshun;Gao Lang;Zhang Xueling;Lin Jiewei;Dai Huwei(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;School of Mechanical Engineering,Tianjin Ren’ai College,Tianjin 301636,China)

机构地区：[1]天津大学先进内燃动力全国重点实验室,天津300072 [2]天津仁爱学院机械系,天津301636

出　　处：《天津大学学报（自然科学与工程技术版）》2025年第1期1-11,共11页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(52205166);天津市自然科学基金资助项目(22JCQNJC00350);中国博士后科学基金资助项目(2021M702430)。

摘　　要：针对熔融硅酸盐环境沉积物(CMAS)侵蚀诱发含冷却孔热障涂层结构热防护性能下降的问题,研究了不同吹风比下的CMAS的非均匀侵蚀行为及其对热障涂层(TBCs)隔热性能的影响.在Fluent软件中,考虑热传导、热对流和热辐射(热辐射使用离散纵坐标辐射模型),建立共轭传热模型得到了在吹风比为1.5、1.0和0.5时TBC-气膜冷却系统的温度分布,在ABAQUS中建立三维相场模型(PFM)模拟CMAS的非均匀侵蚀行为,定量分析不同吹风比下CMAS侵蚀行为对TBC-气膜冷却系统温度分布的影响.分析了侵蚀300 h前后TBCs-气膜冷却系统温度场的变化,探讨了在不同吹风比下CMAS非均匀侵蚀对TBCs靠近主流入口、冷却孔入口前缘、冷却孔出口后缘和主流出口4个典型位置沿涂层厚度方向路径上热阻的影响.结果表明:TBC-气膜冷却系统在工作条件下具有三维温度梯度,沿主流流动方向和沿TBCs厚度方向上有较高的温度梯度,冷却孔附近区域温度分布的不均匀度高.陶瓷(TC)层中的CMAS浓度分布呈明显的不均匀性,在高温度区域内CMAS侵蚀速率更高,吹风比降低会引起TC层温度上升,温度不均匀性下降,CMAS的侵蚀程度增加,浓度分布的不均匀性下降.CMAS侵蚀会降低TBCs的隔热性能,吹风比为1.5、1.0和0.5时,侵蚀前后TBCs在靠近主流入口位置沿厚度方向路径上热阻下降率最高,分别为16.47%、17.13%和17.55%.CMAS侵蚀对TBCs在冷却孔出口后缘的隔热性能的影响较小,热阻在侵蚀前后的变化不大.Aiming at the challenges posed by CaO-MgO-SiO2-Al2O3(CMAS)penetration,which leaded to thermal insulation performance degradation in thermal barrier coatings(TBCs)within air film cooling systems,this study explored the behavior of non-uniform CMAS penetration under various blowing ratios and its impact on thermal insulation performance.Utilizing Fluent for simulation,a conjugate heat transfer model was developed.This model,which accounted for heat conduction,convection and radiation(with radiation modeled using a discrete longitudinal radiation approach),enabled the analysis of temperature distribution across the TBC-air film cooling system at blowing ratios of 1.5,1.0,and 0.5.Furthermore,a three-dimensional phase field model(PFM)was constructed within ABAQUS to simulate the non-uniform CMAS penetration behaviors.This model facilitated an in-depth examination of how CMAS penetration affected the temperature distribution of the TBC-air film cooling system at different blowing ratios.The temperature distribution in the TBCs-air film cooling system after 300 h-penetration was compared.The study meticulously analyzed the effects of non-uniform CMAS penetration on the thermal insulation performance of TBCs across the in-thickness path of four positions:near the main stream inlet,at the leading and trailing edges of the cooling hole,and at the mainstream outlet.This quantitative analysis was conducted across different blowing ra-tios.Findings showed that the TBC-air film cooling system had a three-dimensional temperature gradient under opera-tional conditions.Notably,there were high temperature gradients both along the main flow direction and through the thickness of the TBCs,alongside a high degree of inhomogeneity in temperature distribution near the cooling holes.The CMAS concentration distribution within the top coating(TC)layer was found to be significantly uneven,with penetration rates increasing in higher-temperature regions.A decrease in blowing ratio was observed to increase the temperature of the TC layer whil

关 键 词：吹风比 热障涂层 CMAS非均匀侵蚀 隔热性能 

分 类 号：TK448[动力工程及工程热物理—动力机械及工程]