端壁轮廓对涡轮叶片流道传热的影响

IF 0.2 Q4 ENGINEERING, MULTIDISCIPLINARY
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引用次数: 0

摘要

该研究探讨了轴对称端壁轮廓,重点是设计能够降低热负荷的新型端壁。参数化优化由端壁的平面形状数值决定,导致端壁的轮廓形状与大量消耗的传热在叶片的通道。在出口雷诺数为2 × 106的情况下,对生成的异形端壁的传热特性进行了分析。端壁三维轮廓对二次流涡、射流-二次流相互作用以及平端壁上的气膜冷却效果产生了显著的影响。结果表明,轴对称收敛型能显著提高端壁气膜冷却效果,特别是对于整个叶片中难以冷却的区域,但效益水平受吹风比的显著影响。所获得的效率证明了交叉通道对冷却剂在平端壁顶部扩散的流动影响以及在高吹气比下射流升力的适应性。当前工作的最佳质量流量选择可以识别端壁的通道,其形状比平面端壁具有更高的轴向涡轮效率和耐久性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Accomplishments of Endwall Contouring on Heat Transfer in a Passage of a Turbine Blade
The study explores axisymmetric endwall contouring with emphasis on the design of novel endwalls capable of heat load reduction. Optimizations with parameterization numerically determined by the endwall of flat shape led to the endwall of the contoured shape with substantial depletion of heat transfer in the passage of the vane. Heat transfer attributes for the generated contoured endwalls were analyzed for the exit Reynolds number of 2 × 106 . Endwall three-dimensional contouring resulted in remarkable changes in secondary flow vortices, jet-to-secondary flow interaction, and film cooling effectiveness on the flat endwall. The results pointed out that the axisymmetric convergent contouring causes a significant increase in endwall film cooling, especially for the hard-to-cooled regions throughout the vane, but the level of benefit is significantly affected by the blowing ratios. The obtained efficacy demonstrated the flow impact of the cross-passage on the proliferation of the coolant on top of the flat endwall and the amenability for jet lift-off at elevated blowing ratios. The optimal mass flow rate selection of the current work could identify the passage of the endwall, contoured with superior axial turbine efficiency and durability than that of the flat endwall.
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来源期刊
Makara Journal of Technology
Makara Journal of Technology ENGINEERING, MULTIDISCIPLINARY-
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13
审稿时长
20 weeks
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