Experimental study on film cooling of turbine blade leading edge in deposition environment
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摘要:
为研究沉积物对涡轮叶片前缘气膜冷却的影响，实验采用石蜡沉积模拟真实沉积。通过改变主流的温度、气膜孔射流角度及气膜孔孔径，观察了沉积环境下气膜冷却效率及沉积率的变化规律。实验结果表明：颗粒物沉积在障碍物表面的形貌受到主流温度的影响较大，当主流温度接近颗粒物熔点时，沉积覆盖最明显。在相同实验条件下，随着射流角度增大，单个气膜孔覆盖区域减小，气膜冷却效率下降，沉积前后，射流角度25°和65°的气膜冷却效率最大相差2%和5.6%，沉积率随射流角度的增大而升高；随着孔径增大，气膜冷却效率先降低后升高，其中4.5 mm孔径无论是否沉积，气膜冷却效率均最高，比3 mm孔径的气膜冷却效率高3.6%和3.2%。沉积率在孔径3 mm时最低。
Abstract:In order to study the effect of deposition of pollutants on film cooling of blade leading edge of turbine, the experiment used paraffin deposition to simulate real deposits.By changing the mainstream temperature, the angle of film hole jet and the diameter of film hole, the variation of film cooling efficiency and deposition rate in deposition environment was observed experimentally. The experimental results show that the morphology of particulate deposition on the barrier surface is significantly affected by the mainstream temperature. When the mainstream temperature approaches the melting point of particulate matter, the deposition coverage is most obvious. Under the same experimental conditions, with the increase of jet angle, the coverage area of single film hole decreases, and the film cooling efficiency decreases. Before and after deposition, the maximum difference between film cooling efficiency at jet angle 25° and jet angle 65° is 2% and 5.6%, and deposition rate increases with the increase of jet angle; with the increase of pore diameter, the film cooling efficiency first decreases and then increases. Whether there is deposition or not, the film cooling efficiency of 4.5 mm pore diameter is the highest, 3.6% and 3.2% higher than that of 3 mm pore diameter. The deposition rate is the lowest when the pore diameter is 3 mm.
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Key words:
- film cooling /
- deposition rate /
- leading edge /
- pore diameter /
- jet angle
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图 6 不同主流温度下石蜡颗粒沉积形貌图
Figure 6. Morphology of paraffin particle deposition at different mainstream temperatures
图 8 不同射流角度下气膜冷却圆柱表面沉积前后形貌图
Figure 8. Morphology of film cooling cylinder surface before and after deposition at different jet angles
图 9 不同射流角度下气膜冷却圆柱表面沉积前后气膜冷却效率云图
Figure 9. Contour of film cooling efficiency before and after deposition of film cooling cylinder surface at different jet angles
图 10 沉积前不同射流角度下滞止线上的气膜冷却效率曲线
Figure 10. Film cooling efficiency curves of stagnation line at different jet angles before deposition
图 11 沉积后不同射流角度下滞止线上的气膜冷却效率曲线
Figure 11. Film cooling efficiency curves of stagnation line at different jet angles after deposition
图 13 不同气膜孔孔径下气膜冷却圆柱表面沉积前后形貌图
Figure 13. Morphology of film cooling cylinder surface before and after deposition at different film pore diameters
图 14 不同气膜孔孔径下气膜冷却圆柱表面沉积前后气膜冷却效率云图
Figure 14. Contour of film cooling efficiency before and after deposition of film cooling cylinder surface at different film pore diameters
图 15 沉积前不同气膜孔孔径下滞止线上的气膜冷却效率曲线
Figure 15. Film cooling efficiency curves of stagnation line at different film pore diameters before deposition
图 16 沉积后不同气膜孔孔径下滞止线上的气膜冷却效率曲线
Figure 16. Film cooling efficiency curves of stagnation line at different film pore diameters after deposition
表 1 颗粒物性和缩放参数对照
Table 1. Contrast of particle properties and scaling parameters
参数 发动机 实验 颗粒粒径/μm 0.1~10 1~120 颗粒密度/(kg·m-3) 1 980[4] 900 颗粒速度/(m·s-1) 93[9] 3 动力黏度/(kg·(m·s)-1) 5.55×10-5 1.82×10-5 气膜孔直径/mm 0.5 3 熔解潜热/(J·kg-1) 650 000[18] 234 720 比热容/(J·(kg·K)-1) 730[19] 2 090 颗粒固化温度/K 1 533[20] 331.15 主流温度/K 1 500[21] 328.15 颗粒初始温度/K 1 593[21] 373.15 颗粒输运长度/m 0.26 1.5 Stk 0.004~40 0.003~40 TSP 0.012~1.2 0.02~2.8 
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