Numerical study on coupling effects of particle deposition and film cooling over flat plate surfaces
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摘要:
基于颗粒物沉积模型与动网格技术，研究了不同冷气质量流量比与颗粒物直径下气膜冷却平板表面的沉积特性及颗粒形成沉积物后对平板气膜冷却性能的影响。结果表明：在颗粒速度较低时，冷气射流对颗粒的吹拂作用使其难以在气膜孔下游沉积，且冷气射流结构对颗粒的阻隔与卷吸作用使得气膜孔下游两侧形成明显的脊状沉积带；平板表面的沉积效率随颗粒直径的变化呈现双峰分布；在较大的质量流量比下，冷气射流两侧拢起的脊状沉积带会使得气膜冷却效率显著提高，相比沉积前最大提升了6.15%；同时，颗粒沉积物能增强冷气的横向扩散，使得横向平均冷却效率有一定程度的提升。总体而言，颗粒沉积物对气膜冷却性能的影响由沉积分布特征与沉积量共同决定。
Abstract:Using a particle deposition model and a dynamic mesh technique, the deposition characteristics over a flat plate surface with film cooling under different mass flow ratios and particle sizes were studied. In addition, the effects of particle deposition on film cooling over the flat plate were investigated. Results revealed that at a low particle velocity, the blowing of the coolant acting on the particles made it difficult to deposit in the downstream region of film holes, and an obvious ridged shape of deposits was formed on both sides due to the blocking and entrainment of the cooling jet. However, distribution of the capture efficiency presented a bimodal pattern with the change of particle sizes. At high mass flow ratios, the ridged deposition significantly improved the cooling effectiveness, which was 6.15% higher than that before deposition. Additionally, particle deposition could enhance the lateral spreading of the coolant and improved the laterally-averaged cooling effectiveness. In general, the effects of particle deposition on film cooling performance were determined by both distribution characteristics and thickness of the deposition.
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Key words:
- particle deposition /
- film cooling /
- coolant mass flow ratio /
- Stokes number /
- dynamic mesh
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图 2 圆柱气膜孔平板通道计算模型
Figure 2. Computation model of flat plate with cylindrical film hole
图 3 不同网格数量下中心线气膜冷却效率
Figure 3. Centerline film cooling effectiveness with different meshes
图 6 不同冷气质量流量比下平板表面沉积量分布
Figure 6. Deposition distribution on plate surface with different coolant mass flow ratio
图 7 沉积效率随冷气质量流量比的变化
Figure 7. Variation of capture efficiency with coolant mass flow ratio
图 9 平板表面沉积厚度分布（treal=500 h）
Figure 9. Distribution of deposition thickness on flat plate surface （treal=500 h）
图 10 平板表面横向平均沉积厚度（treal=500 h）
Figure 10. Laterally-averaged deposition thickness on flat plate surface （treal=500 h）
图 11 不同质量流量比下沉积前和沉积后平板表面气膜冷却效率分布
Figure 11. Film cooling effectiveness on flat plate surface with different mass flow ratios before and after deposition
图 12 不同质量流量比下沉积前后中心线气膜冷却效率对比
Figure 12. Centerline film cooling effectiveness with different mass flow ratios before and after deposition
图 13 沉积前后横向平均气膜冷却效率对比
Figure 13. Laterally-averaged film cooling effectiveness with different mass flow ratios before and after deposition
图 14 不同质量流量比沉积前后面平均气膜冷却效率对比
Figure 14. Area-averaged film cooling effectiveness with different mass flow ratios before and after deposition
图 15 不同斯托克斯数下平板表面沉积量分布情况
Figure 15. Distributions of deposition on flat plate with different Stokes numbers
图 17 不同斯托克斯数下沉积前后平板表面气膜冷却效率分布（
$\gamma $ =1.0%）Figure 17. Film cooling effectiveness with different Stokes numbers before and after deposition （
$\gamma$ =1.0%）
图 18 不同斯托克斯数下沉积前后中心线冷却效率对比
Figure 18. Centerline film cooling effectiveness with different Stokes numbers before and after deposition
图 19 不同斯托克斯数下沉积前后横向平均冷却效率对比
Figure 19. Laterally-averaged film cooling effectiveness with different Stokes number before and after deposition
图 20 不同斯托克斯数下沉积前后面平均冷却效率对比
Figure 20. Area-averaged film cooling effectiveness with different Stokes number before and after deposition
表 1 颗粒直径与斯托克斯数的对应关系
Table 1. Particle diameter and Stokes number
颗粒直径dp/μm 斯托克斯数St 1 0.016 5 0.403 10 1.613 20 6.454 30 14.521 40 25.815 50 40.336 60 58.084 70 79.059 80 103.261 
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