张王子,谭晓茗,韦裕恒,张镜洋.带热障涂层的涡轮叶片气膜冷却与流阻特性分析[J].表面技术,2025,54(6):217-229.
ZHANG Wangzi,TAN Xiaoming,WEI Yuheng,ZHANG Jingyang.Analysis of Film Cooling and Flow Resistance Characteristics of Turbine Blades with Thermal Barrier Coatings[J].Surface Technology,2025,54(6):217-229 |
| 带热障涂层的涡轮叶片气膜冷却与流阻特性分析 |
| Analysis of Film Cooling and Flow Resistance Characteristics of Turbine Blades with Thermal Barrier Coatings |
| 投稿时间：2024-04-23 修订日期：2024-10-22 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.06.020 |
| 中文关键词: 气膜冷却 热障涂层 粗糙度 综合冷却效率 能量损失系数 流量系数 |
| 英文关键词:film cooling thermal barrier coating surface roughness overall cooling effectiveness energy loss coefficient flow coefficient |
| 基金项目:航空发动机及燃气轮机基础科学中心项目(P2022-A-III-003-001) |
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| 中文摘要: |
| 目的 获得涡轮导向叶片附加热障涂层后叶栅通道、气膜孔流动损失和叶片表面气膜冷却效率的变化规律。方法 采用三维数值模拟，研究某型发动机涡轮导向叶片敷设热障涂层后，热障涂层厚度和表面粗糙度2个参数对气膜孔、叶栅通道流动特性和叶片表面气膜冷却效率的影响。结果 热障涂层厚度与表面粗糙度增加，会导致气膜孔流量系数减小、叶栅通道总压损失系数与能量损失系数增大;叶片基底冷效与温度削减率随着涂层厚度增加不断增大，当陶瓷层厚度增加至0.4 mm，叶片基底平均冷效提升19.1%，温度削减率高达6.5%;随着涂层表面粗糙度增加，叶片基底平均冷效与涂层表面平均冷效均下降，粗糙度为20 μm时降幅分别为7.2%、8.9%;在研究范围内，温度削减率与表面粗糙度呈正相关，最大高达2.58%。结论 在研究参数范围内，附加热障涂层可以明显提升叶片表面综合冷效，但也增加了叶栅通道与气膜孔的流动损失;热障涂层表面粗糙度的增大不利于热障涂层的热防护和减小流动损失。 |
| 英文摘要: |
| The application of thermal barrier coatings (TBCs) as an effective passive heat protection measure for turbine blades is widely employed. However, applying thermal barrier coatings can lead to aerodynamic changes in the blade passage and film cooling holes. Three-dimensional numerical simulations are conducted for a specific type of engine turbine guide vanes through uniform application of TBCs. The study focuses on the effects of two parameters, namely, TBC thickness and surface roughness, on the characteristics of film cooling holes, guide vane passage flow, and film cooling effectiveness. The results indicate that the application of TBCs leads to a decrease in film hole mass flow coefficient, an increase in total pressure loss coefficient and energy loss coefficient in the guide vane passage. Additionally, the aerodynamic losses in the guide vane passage and film holes are positively correlated with TBC thickness. However, the application of TBCs effectively enhances the cooling effectiveness at the base of the blade. As the TBC thickness increases, the cooling effectiveness at the base of the blade improves. Furthermore, the temperature reduction rate increases with the increasing TBC thickness. When the ceramic layer thickness reaches 0.4 mm, the average cooling effectiveness at the base of the blade increases by 19.1%, with a temperature reduction rate as high as 6.5%. Due to the low thermal conductivity of TBCs, the surface cooling effectiveness decreases with the increasing TBC thickness. When the surface roughness of TBCs changes, it is observed that as the surface roughness increases, the film hole mass flow coefficient decreases, and the total pressure loss coefficient and energy loss coefficient in the guide vane passage increase. Moreover, both the cooling effectiveness at the base of the blade and the average surface cooling effectiveness decrease with the increasing surface roughness. When the surface roughness height of the coating reaches 20 μm, the decrease in cooling effectiveness at the base of the blade and surface cooling effectiveness is 7.2% and 8.9%, respectively. However, the temperature reduction rate increases with the increasing surface roughness, reaching 2.58% at a roughness height of 20 μm. In conclusion, within the parameter range studied in this work for TBC thickness and surface roughness, the addition of TBCs is beneficial for thermal protection on the blade surface. The cooling effectiveness at the blade surface increases with the increasing TBC thickness, but the rate of increase diminishes as the TBC thickness increases. Meanwhile, the thermal insulation effect of TBCs is enhanced, leading to an increasing temperature reduction rate with the increasing TBC thickness. However, increasing TBC thickness results in the increased flow losses in the guide vane passage and film holes. The aerodynamic losses in the film holes and guide vane passage increase with the increasing surface roughness, deteriorating the thermal protection effect of TBCs. Both the cooling effectiveness at the base of the blade and the surface cooling effectiveness decrease with the increasing surface roughness, while the thermal insulation effect of TBCs is strengthened. The temperature reduction rate is positively correlated with the surface roughness, increasing with the increasing surface roughness. |
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