Study on heat transfer characteristics of V-shaped discrete ribs in turbine blade passage
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摘要:
通过模拟仿真的方法研究了涡轮叶片通道内部V型间断肋的传热特性。主要探究了各结构参数（间断位置，分离肋长度，分离肋后置距离）对通道的传热性能影响。结果表明：相对于传统的扰流肋结构（直肋，60°斜肋，60°V型肋），V型间断肋在壁面平均相对努塞尔数，综合传热系数以及温度分布均匀性上更具优势。通过改变间断参数，能大幅提高V型间断肋的综合传热系数。在研究的参数范围内，当间断位置为2.5 mm，分离肋长度为10.0 mm，分离肋后置距离为9.6 mm时，通道具有最佳的传热性能。在雷诺数为30000下，与带有直肋的通道相比，优化后的V型间断肋的平均努塞尔数提高了35.75%，综合传热系数上升了28.95%。
Abstract:The heat transfer characteristics of V-shaped discrete ribs in the internal passage of turbine blade were studied by simulation. The effects of structural parameters (separation positions, separation rib length, separation rib distance) on the heat transfer performance of the channel were investigated. The results showed that: compared with the traditional structure (transverse rib, 60° inclined rib, 60° V-shaped rib), V-shaped discrete rib had more advantages in terms of average relative Nusselt number, comprehensive heat transfer coefficient and temperature distribution uniformity. By changing the discrete parameters, the comprehensive heat transfer coefficient of V-shaped discrete ribs can be greatly improved. The channel had the best heat transfer performance when the separation positions was 2.5 mm, the length of separation rib was 10.0 mm and the distance behind separation rib was 9.6 mm. At the Reynolds number of 30 000, compared with the channel with transverse ribs, the average Nusselt number of the optimized V-shaped discrete ribs increased by 35.75%, and the comprehensive heat transfer coefficient increased by 28.95%.
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Key words:
- turbine blade /
- internal cooling /
- spoiler rib /
- heat transfer characteristics /
- V-shaped rib
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图 8 不同类型肋的综合传热系数
Figure 8. Comprehensive heat transfer coefficient of different types of ribs
图 9 不同类型肋的相对努塞尔数分布
Figure 9. Relative Nusselt number distribution of different rib types
图 12 不同间断位置下的相对努塞尔数
Figure 12. Relative Nusselt numbers under different separation positions
图 13 不同间断位置下的相对压力损失
Figure 13. Relative pressure loss at different separation positions
图 14 不同间断位置下的综合传热系数
Figure 14. Comprehensive heat transfer coefficient at different separation positions
图 16 不同间断位置下的相对努塞尔数分布
Figure 16. Relative Nusselt number distribution at different separation positions
图 17 不同间断位置下的相对温度分布
Figure 17. Relative temperature distribution at different separation positions
图 18 不同分离肋长度下的相对努塞尔数
Figure 18. Relative Nusselt number under different separation rib lengths
图 19 不同分离肋长度下的相对压力损失
Figure 19. Relative Pressure loss under different separation rib lengths
图 20 不同分离肋长度下的综合传热系数
Figure 20. Comprehensive heat transfer coefficient under different separation rib length
图 21 不同分离肋长度下的涡量分布
Figure 21. Vorticity distribution under different separation rib length
图 22 不同分离肋长度下的相对努塞尔数分布
Figure 22. Relative Nusselt number distribution under different separation rib length
图 23 不同分离肋长度下的相对温度分布
Figure 23. Relative temperature distribution under different separation rib length
图 24 不同分离肋后置距离下的相对努塞尔数
Figure 24. Relative Nusselt number under different separation rib post distance
图 25 不同分离肋后置距离下的相对压力损失
Figure 25. Relative pressure loss under different separation rib post distance
图 26 不同分离肋后置距离下的综合传热系数
Figure 26. Comprehensive heat transfer coefficient under different separation rib post distance
图 27 不同分离肋后置距离下的涡量分布
Figure 27. Vorticity distribution under different separation rib post distance
图 28 不同分离肋后置距离下的相对努塞尔数分布
Figure 28. Relative Nusselt number distribution under different separation rib post distance
图 29 不同分离肋后置距离下的相对温度分布
Figure 29. Relative temperature distribution under different separation rib post distance
表 1 参数设置范围
Table 1. Parameter setting range
参数 变化范围 间断位置M/mm 2.5～12.5 分离肋长度G/mm 5.0～15.0 分离肋后置距离B/mm 7.2～16.8 
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