Effects of composite cooling medium on the cooling of curved slit film holes
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摘要:
针对无扰流柱和有扰流柱结构进气方式下不同曲率半径表面缝形气膜孔，采用数值模拟方法研究了空气、蒸汽和液滴掺混等复合冷却工质对气膜冷却特性的影响。结果表明：当吹风比为1.0、1.5和2.0时，相比于平直表面缝形气膜孔，凸表面平均气膜冷却效率普遍较低，凹表面平均气膜冷却效率普遍较高，随曲率逐渐减小，冷却效率逐渐增加。冷却工质为空气与蒸汽掺混时，气膜冷却效率随蒸汽质量流量增加而增加。冷却工质为空气与液滴掺混时，与传统单工质纯空气相比，液滴质量百分数越大平均气膜冷却效率提升越多，但在同样质量百分数条件下，液滴直径并非越大越好。
Abstract:The effects of air, steam and droplet mixing on the film cooling characteristics were numerically simulated for the slit-shaped film holes on the curved surface with different curvature radii under the cooling inlet with/without pin fins structure. The results showed that compared with the flat surface, under the case of mass ratio equal to 1.0, 1.5 and 2.0, the average film cooling efficiency of the convex surface slot film hole was lower, and the average film cooling efficiency of the concave surface slot film hole was basically higher. With the decrease of curvature, the cooling efficiency gradually increased. When the cooling medium was air and steam mixture, the film cooling efficiency increased with the increase of steam mass flow rate. When the cooling air was mixed with droplets, compared with pure air, the average film cooling efficiency increased as the mass flow rate increased. Under the same mass flow rate of droplets conditions, the diameter of droplet was not necessarily better when bigger.
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Key words:
- film cooling /
- curvature radius /
- slit-shaped film cooling hole /
- steam /
- droplets
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图 6 曲面缝形气膜孔气膜冷却效率随曲率变化图
Figure 6. Curved slit film hole film cooling efficiency with curvature variation
图 7 不同结构z方向中心截面温度云图和冷气流线图
Figure 7. Temperature cloud diagram and cold air streamline diagram of central section in z direction of different structures
图 8 不同曲率半径结构缝出口（x=5 mm）处温度云图和速度矢量图
Figure 8. Temperature nephogram and velocity vector diagram at the outlet of structural joints with different curvature radii （x=5 mm ）
图 9 各曲率半径表面无扰流柱结构平均气膜冷却效率
Figure 9. Average film cooling efficiency of the non-turbulent column structure on the surface of each curvature radius
图 10 各曲率半径表面有扰流柱结构平均气膜冷却效率
Figure 10. Average film cooling efficiency of the spoiler structure on the surface of each curvature radius
图 11 蒸汽掺混条件下无扰流柱结构平均气膜冷却效率
Figure 11. Average film cooling efficiency of the non-turbulent column structure under steam mixing conditions
图 12 蒸汽掺混条件下有扰流柱结构平均气膜冷却效率
Figure 12. Average film cooling efficiency of the spoiler structure under steam mixing conditions
图 13 不同直径和质量流量占比液滴掺混时凸面无扰流柱结构平均冷却效率
Figure 13. Average cooling efficiency of the convex non-turbulent column structure with different diameters and mass flow ratios is mixed with droplets
图 14 不同直径和质量流量占比液滴掺混时凹面无扰流柱结构平均冷却效率
Figure 14. Average cooling efficiency of the concave non-turbulent column structure with different diameter and mass flow ratio is mixed with droplets
图 15 不同直径和质量流量占比液滴掺混时凸面有扰流柱结构平均冷却效率
Figure 15. Average cooling efficiency of the convex spoiler structure with different diameters and mass flow ratios when the droplets are mixed
图 16 不同直径和质量流量占比液滴掺混时凹面有扰流柱结构平均冷却效率
Figure 16. Average cooling efficiency of the concave spoiler structure with different diameters and mass flow ratios when the droplets are mixed
图 17 液滴直径为8.0 μm液滴不同质量流量占比下R/D=$\infty $时液滴轨迹图
Figure 17. Droplet trajectory when R/D=$\infty $ under different mass flow ratios of droplets with a diameter of 8.0 μm
表 1 边界条件设置
Table 1. Boundary condition settings
边界条件 参数 数值 进口质量流量/（kg/s） m1 0.00425 主流进口温度/K Tin,s 600.0 次流进口温度/K Tin,c 300.0 出口静压/Pa pout,s 101325 吹风比 M 0.5，1.0，1.5，2.0 蒸汽质量流量比/% Fs 25.0，50.0，75.0，100.0 液滴直径/μm d 4.0，6.0，8.0，10.0 液滴质量流量比/% Fd 4.0，6.0，8.0，10.0 
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