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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Auxiliary hole influence on internal flow characteristics in bend region of a real investment-casting blade coolant channel
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Auxiliary hole influence on internal flow characteristics in bend region of a real investment-casting blade coolant channel

机译：辅助孔对实际投资铸造刀片冷却液通道弯曲区域内部流动特性的影响

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摘要

For modern investment-casting turbine blades, auxiliary holes (AHs) are unavoidable to be generated near internal coolant channels; however, the additional effect of AH is usually ignored. In this work, the AH-injection influence on the flow characteristics in a round bend was studied, using a planar Time-resolved Particle Image Velocimetry (TRPIV) system. The main feature of this experiment was the application of a ribbed channel with the real blade geometry as the specimen. At first, in the real bend, different flow phenomena from those in the simplified models reported in the past literature can be observed, i.e. asymmetrical mainstream near two sides of blade and a superposition of secondary vortices downstream of bend. Subsequently, the AH influences on the special flow mentioned above were discussed at an inlet Reynolds number (Re-in) of 21,500 and five AH-to-inlet mass flow ratios (MFRS = 0-10%). The conditions at MFR larger than 5% can obviously change the original flow at MFR = 0 and due to the real blade geometry, the various influences can be observed in different planes. In general, the sizes of separation bubble and corner vortex can be suppressed by the AH-injection; however, the AH-injection effects on the flow impingement are complex, i.e. enhancement on suction side but reduction on pressure side. Finally, through the increase of Re-in from 21,500 to 39,000, it can be found that at a given MFR, the flow impingement and turbulent kinetic energy can be simultaneously enhanced by Re-in.
机译：对于现代投资铸造涡轮刀片，辅助孔（AHS）是不可避免的，在内部冷却剂通道附近产生;然而，通常忽略AH的额外效果。在这项工作中，研究了使用平面的时分分辨粒子图像速度（TRPIV）系统对圆形弯曲中的流动特性的AH注射影响。该实验的主要特点是将带有真正叶片几何形状的罗纹通道应用于样品。首先，在真实的弯曲中，可以观察到过去文献中报告的简化模型中的不同流动现象，即在叶片的两侧附近的不对称主流和弯曲下游的次级涡流的叠加。随后，在21,500和5 AH到入口质量流量比（MFRS = 0-10％）的入口雷诺数（重新入口）上讨论了对上述特殊流程的AH影响。 MFR大于5％的MFR的条件明显改变MFR = 0的原始流程，并且由于实际叶片几何形状，可以在不同的平面中观察到各种影响。通常，通过AH注射可以抑制分离气泡和角涡流的尺寸;然而，对流动冲击的AH注射效应是复杂的，即对吸入侧的增强，但在压力侧减小。最后，通过增加重新进入21,500至39,000，可以发现在给定的MFR处，可以通过再入同时增强流动冲击和湍流动能。

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