End-wall heat transfer of a rectangular bluff body at different heights: Temperature-sensitive paint measurement and computational fluid dynamics

被引:15
作者
Ghorbani-Tari, Zahra
Chen, Yujia
Liu, Yingzheng [1 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Key Lab, Educ Minist Power Machinery & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
关键词
End-wall heat transfer; TSP; CFD; Vortex; HORSESHOE VORTEX;
D O I
10.1016/j.applthermaleng.2017.05.040
中图分类号
O414.1 [热力学];
学科分类号
摘要
Complementary methods - temperature sensitive paint measurement and computational fluid dynamics - are used to elucidate the end-wall heat transfer of a rectangular body in a turbulent channel flow. Four systems with bluff body-height-to-channel-height ratio H-b/H = 0.25, 0.5, 0.75, and 1.0 are compared. For H-b/H = 1.0, an extremely high heat transfer rate is observed in the upstream area, attributing to the highly unstable corner vortex; the absence of pair vortices entails a distinctly different flow pattern and heat transfer in the downstream region. For H-b/H = 0.75, the presence of the paired vortices together with Karman vortex shedding leads to the arch-shaped vortex and heat transfer augmentation. Ongoing from H-b/H = 0.75 to 0.25, the growth of the arch vortex is highly weakened. At H-b/H = 0.25, the heat transfer measurement reflects the absence of the Karman vortex in the wake region. Augmentation of the convective heat transfer pertinent to the shear layer's reattachment is shown to be sensitive to H-b/H. As Half decreases, the reduced reattachment length results in attenuated heat transfer in the wake region; the strength of the horseshoe vortex structure, characterized by the heat transfer rate, is also progressively weakened. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:697 / 705
页数:9
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