Assessment of film cooling's surface quantities using pressure- and temperature-sensitive paint: Comparisons between shaped and sand-dune inspired holes
Assessment of film cooling's surface quantities using pressure- and temperature-sensitive paint: Comparisons between shaped and sand-dune inspired holes
复制标题
使用压力和温度敏感涂料评估薄膜冷却的表面量：异形孔和沙丘孔之间的比较
DOI：
10.1016/j.expthermflusci.2018.10.005
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发表时间：
2019
影响因子：
3.2
通讯作者：
Hu Hui
中科院分区：
文献类型：
--
作者：
Zhou Wenwu;Peng Di;Liu Yingzheng;Hu Hui
继之前的工作（Zhou and Hu，2017）之后，进行了全面评估，以进一步评估形状和沙丘启发的孔后面的气膜冷却的表面量。在四种吹气比（M=0.40、0.90、1.40 和 2.00）下测量绝热气膜冷却效率、传热系数和净热通量减少量 (NHFR)。对形状洞和沙丘启发洞之间的测量值进行了并排比较。压敏涂料（PSP）技术用于获得高分辨率绝热效率，温敏涂料（TSP）技术用于绘制表面上相应的传热系数。密度比约为1的氮气和空气分别用作PSP和TSP测试的冷却剂。测量结果表明，新月形沙丘形注射化合物（BDSIC）的绝热效率明显高于异形孔。与异形孔相比，在 BDSIC 后面观察到中心线提高了 20-150%，横向平均有效性提高了 30-400%。至于传热性能，尽管 BDSIC 的传热系数 hf/h0 高出 10-20%，但测量的空间平均 NHFR 与异形孔相比，热通量减少量仍增加了 50-150%。本文首次使用 PSP 和 TSP 技术全面评估 BDSIC 薄膜冷却概念背后的表面量。
Following the previous work (Zhou and Hu, 2017), a comprehensive assessment was performed to further evaluate the film cooling’s surface quantities behind shaped and sand dune-inspired holes. Adiabatic film cooling effectiveness, heat transfer coefficient, and net heat flux reduction (NHFR) were measured at four blowing ratios (M= 0.40, 0.90, 1.40, and 2.00). The measured quantities were compared side-by-side between the shaped and sand dune-inspired holes. The pressure-sensitive paint (PSP) technique was used to acquire high-resolution adiabatic effectiveness and the temperature-sensitive paint (TSP) technique was used to map the corresponding heat transfer coefficient over the surface. Nitrogen and air, with a density ratio of about one, were used as the coolant for the PSP and TSP tests respectively. The measured results showed that the adiabatic effectiveness of the Barchan dune-shaped injection compound (BDSIC) was significantly higher than that of the shaped hole. Improvements of 20–150% in the centerline and 30–400% in the laterally averaged effectiveness were observed behind the BDSIC compared to the shaped hole. As for the heat transfer performance, although the BDSIC showed 10–20% higher heat transfer coefficient,hf/h0, the measured spatially averaged NHFR still demonstrated an augmentation of 50–150% in heat flux reduction in comparison to the shaped hole. This paper represents the first effort to comprehensively evaluate the surface quantities behind BDSIC film cooling concept using both PSP and TSP techniques.