Impact of Wall Temperature on Heat Transfer Coefficient and Aerodynamics for Three-Dimensional Turbine Blade Passage
Impact of Wall Temperature on Heat Transfer Coefficient and Aerodynamics for Three-Dimensional Turbine Blade Passage
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DOI：
10.1115/1.4036012
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发表时间：
2017-12
影响因子：
2.1
通讯作者：
R. Maffulli;Li He
中科院分区：
文献类型：
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作者：
R. Maffulli;Li He
本工作的目的是研究如何传热系数（HTC）和主要的三维（3D）通道气动特性可能会受到影响的非绝热壁温条件。首次对三维喷嘴导向叶片通道进行了系统的计算研究。讨论了壁面温度对二次流、后缘激波和通道通流能力的影响，强调了壁面温度与三维通道外部空气动力之间的联系和相互作用。当比较低温比和高温比情况时，这些3D流动区域中HTC的局部差异可能高达30-40%。然后提出了一种新的三点非线性校正方法。三点法在减少HTC中的误差方面的益处被清楚地证明。进一步的研究表明，新的方法也提供了更强的鲁棒性，在壁面热通量缩放，特别是当壁面的热条件也被证明是影响层流湍流过渡所表现出的两个完善的过渡模型采用本工作。
The present work is aimed to examine how the heat transfer coefficient (HTC) and main three-dimensional (3D) passage aerodynamic features may be affected by a nonadiabatic wall temperature condition. A systematic computational study has been first carried out for a 3D nozzle guide vane (NGV) passage. The impacts of wall temperature on the secondary flows, trailing edge shock waves, and the passage flow capacity are discussed, underlining the connection and interactions between the wall temperature and the external aerodynamics of the 3D passage. The local discrepancies in HTC in these 3D flow regions can be as high as 30–40% when comparing low and high temperature ratio cases. The effort is then directed to a new three-point nonlinear correction method. The benefit of the three-point method in reducing errors in HTC is clearly demonstrated. A further study illustrates that the new method also offers much enhanced robustness in the wall heat flux scaling, particularly relevant when the wall thermal condition is also shown to influence the laminar–turbulent transition exhibited by two well-established transition models adopted in the present work.