Numerical investigation on cooling and mechanical performance of double wall structure
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摘要:
针对涡轮叶片高效冷却和长寿命高可靠的性能需求，基于流热固耦合的数值计算方法，对典型双层壁冷却结构的气膜孔倾斜角和气膜平板厚度对冷却结构综合冷却效率、最大热应力和最大热机械应力特性的影响机制进行了分析。研究结果表明：气膜平板内壁面产生了较大的热应力，特别是在气膜孔前缘，扰流柱上缘等区域，热应力尤为突出。气膜孔倾斜角从90°减小至30°，综合冷却效率显著增大，但离心作用下的热机械应力也急剧增大。气膜平板厚度较小时，综合冷却效率受内部冲击冷却影响较大而分布不均匀；随着气膜平板厚度增大，离心作用下气膜孔及扰流柱的热机械应力水平均显著降低。
Abstract:In response to the performance requirements of high-efficiency cooling, high-reliability and long-life of turbine blades, the influences of the film hole inclination angle and the film plate thickness of a typical double-wall structure on the overall cooling efficiency, the maximum thermal stress and the maximum thermo-mechanical stress of the structure were analyzed based on the numerical method of fluid-thermal-solid coupling. The inner surface of the film plate generated large thermal stresses, especially at the edge of the film holes and pin-fins. As the film hole inclination angle decreased from 90° to 30°, the overall cooling efficiency increased significantly, but the thermo-mechanical stress under centrifugal force also increased sharply. When the film plate thickness was small, the overall cooling efficiency was affected by the impingement cooling and unevenly distributed. With the increase of the film plate thickness, the thermo-mechanical stress of the film holes and pin-fins under centrifugal force was significantly reduced.
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图 6 不同气膜孔倾斜角下综合冷却效率分布云图
Figure 6. Contours of overall cooling efficiency under different film hole inclination angles
图 7 不同气膜孔倾斜角下展向平均综合冷却效率图（M=1.0）
Figure 7. Spanwise average overall cooling efficiency under different film hole inclination angles （M=1.0）
图 8 不同气膜孔倾斜角下气膜孔截面处流体及固体无量纲温度分布云图
Figure 8. Contours of dimensionless temperature of fluid and solid at the cross-section of the film hole under different film hole inclination angles
图 9 不同气膜孔倾斜角下面平均综合冷却效率图
Figure 9. Surface average overall cooling efficiency under different film hole inclination angles
图 10 不同气膜孔倾斜角下气膜平板外表面和内表面热应力分布云图
Figure 10. Contours of thermal stress on the external and internal surfaces of the film plate under different film hole inclination angles
图 11 不同气膜孔倾斜角下气膜孔截面处热应力分布云图
Figure 11. Contours of thermal stress at the cross-section of the film hole under different film hole inclination angles
图 12 不同气膜孔倾斜角下气膜孔和扰流柱最大热应力曲线
Figure 12. Maximum thermal stress curves of film holes and pin-fins under different film hole inclination angles
图 13 不同气膜孔倾斜角下气膜平板外表面和内表面热机械应力分布云图
Figure 13. Contours of thermo-mechanical stress on the external and internal surfaces of the film plate under different film hole inclination angles
图 14 不同气膜孔倾斜角下气膜孔截面处热机械应力分布云图
Figure 14. Contours of thermo-mechanical stress at the cross-section of the film hole under different film hole inclination angles
图 15 不同气膜孔倾斜角下气膜孔和扰流柱最大热机械应力曲线
Figure 15. Maximum thermo-mechanical stress curves of film holes and pin-fins under different film hole inclination angles
图 16 不同气膜平板厚度下综合冷却效率分布云图
Figure 16. Contours of overall cooling efficiency under different film plate thicknesses
图 17 不同气膜平板厚度下展向平均综合冷却效率图（M=1.0）
Figure 17. Spanwise average overall cooling efficiency under different film plate thicknesses （M=1.0）
图 18 不同气膜平板厚度下面平均综合冷却效率图
Figure 18. Surface average overall cooling efficiency under different film plate thicknesses
图 19 不同气膜平板厚度下气膜平板外表面和内表面热应力分布云图
Figure 19. Contours of thermal stress on the external and internal surfaces of the film plate under different film plate thicknesses
图 20 不同气膜平板厚度下气膜孔截面处热应力分布云图
Figure 20. Contours of thermal stress at the cross-section of the film hole under different film plate thicknesses
图 21 不同气膜平板厚度下气膜孔和扰流柱最大热应力曲线
Figure 21. Maximum thermal stress curves of film holes and pin-fins under different film plate thicknesses
图 22 不同气膜平板厚度下气膜平板外表面热机械应力分布云图
Figure 22. Contours of thermo-mechanical stress on the external surfaces of the film plate under different film plate thicknesses
图 23 不同气膜平板厚度下气膜孔和扰流柱最大热机械应力曲线
Figure 23. Maximum thermo-mechanical stress curves of film holes and pin-fins under different film plate thicknesses
图 24 不同气膜平板厚度下气膜孔截面处热机械应力分布云图
Figure 24. Contours of thermo-mechanical stress at the cross-section of the film hole under different film plate thicknesses
表 1 冷却结构计算参数
Table 1. Calculation parameters of cooling structure
工况编号 M α/（°） Hf/D 1～4 0.5, 1.0, 1.5, 2.0 90 2.5 5～8 0.5, 1.0, 1.5, 2.0 30 2.5 9～12 0.5, 1.0, 1.5, 2.0 45 2.5 13～16 0.5, 1.0, 1.5, 2.0 60 2.5 17～20 0.5, 1.0, 1.5, 2.0 90 1 21～24 0.5, 1.0, 1.5, 2.0 90 2 25～28 0.5, 1.0, 1.5, 2.0 90 3 
下载: 导出CSV
表 2 位移边界条件
Table 2. Displacement boundary condition
位置 位移边界条件 X方向 Y方向 Z方向 线A 0 0 自由端 线B 0 0 自由端 线C 0 0 0 线E 0 0 0
下载: 导出CSV
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