Thermal-hydraulic-dynamic investigation of an inverted self-fluttering vortex generator
Thermal-hydraulic-dynamic investigation of an inverted self-fluttering vortex generator
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DOI：
10.1016/j.ijheatmasstransfer.2022.123374
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发表时间：
2022-11
影响因子：
5.2
通讯作者：
Robin Pham;Sheng Wang;Jack Dahlgren;Nathaniel Grindstaff;Chung-Lung Chen
中科院分区：
文献类型：
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作者：
Robin Pham;Sheng Wang;Jack Dahlgren;Nathaniel Grindstaff;Chung-Lung Chen
静态涡流发生器产生涡流结构;主动发生器通过局部搅动加强涡流。流致振动提出了一种混合的方法来增强热混合：旋涡再分布的作用。为了进一步研究自扑式涡流发生器，本文利用机器学习分析了大量实验数据，包括更广泛的设计参数，以找到大扑动运动开始的一般规律及其对整体热传输和摩擦压力损失特性的影响。此外，本文还比较了扑翼式涡发生器与相同结构的传统涡发生器组合体在热工水力效率上的差异。通过机器学习辅助分析，我们捕捉到了发电机的一个引人注目的行为：幂律状态跨越不同的设计，每次都桥接一个较短的流速范围。这些发现突出了这种设置在某些流动条件下的本地化和专业化。我们观察到的饱和效应的旋涡再分配过程和最终的泵浦功率和热性能之间的收敛。在所有的相互作用中，我们看到了一种倾向于低速流动：更高的效率和更好的热传输-突出的特点，这种扑翼涡流发生器。
Static vortex generators initiate vortical structures; an active generator intensifies the vortices through local agitations. Flow-induced vibrations present a hybrid approach to enhance thermal mixing: the role of vortical redistribution. To further our series of study regarding the self-fluttering vortex generator, machine learning was utilized in this work to analyze a large set of experimental data which includes a broader range of design parameters in order to find a general rule of the onset of the large flapping motion and its effect on the overall thermal transport and frictional pressure loss characteristics. In addition, this paper presented the differences in thermal hydraulic efficiencies of a flapping vortex generator to an aggregation of traditional ones of the same configuration. Through machine-learning-aided analysis, we captured a striking behavior of the generator: the power-law regime spanning across different designs, bridging a shorter flow speed range each time. Such findings highlight the localization and specialization of such setups to certain flow conditions. We observe a saturation effect of the vortical redistribution process and the eventual convergence between pumping power and thermal performance. Among all interactions, we see a propensity toward lower-speed flows: higher efficiencies and better thermal transport– stands out as the characteristic of this flapping vortex generator.