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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Skin friction drag reduction on a flat plate turbulent boundary layer using synthetic jets
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Skin friction drag reduction on a flat plate turbulent boundary layer using synthetic jets

机译：APS -70TH液体动力学APS划分年会 - 事件 - 使用合成式喷射器对平板湍流边界层的皮肤摩擦减阻

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In these studies, we investigate the effect of mild synthetic jet actuation on a flat plate turbulent boundary layer with the goal of interacting with the large scales in the log region of the boundary layer and manipulating the overall skin friction. Results will be presented from both large eddy simulations (LES) and wind tunnel experiments. In the experiments, a large parameter space of synthetic jet frequency and amplitude was studied with hot film sensors at select locations behind a pair of synthetic jets to identify the parameters that produce the greatest changes in the skin friction. The LES simulations were performed for a selected set of parameters and provide a more complete evaluation of the interaction between the boundary layer and synthetic jets. Five boundary layer thicknesses downstream, the skin friction between the actuators is generally found to increase, while regions of reduced skin friction persist downstream of the actuators. This pattern is reversed for forcing at low frequency. Overall, the spanwise-averaged skin friction is increased by the forcing, except when forcing at high frequency and low amplitude, for which a net skin friction reduction persists downstream. The physical interpretation of these results will be discussed.
机译：在这些研究中，我们研究了温和的合成喷射致动对平板湍流边界层对平板湍流边界层的影响，其目的是与边界层的日志区域中的大尺度相互作用并操纵整体皮肤摩擦。结果将从大型涡流模拟（LES）和风洞实验中提出。在实验中，在一对合成喷射器后面的选择位置处使用热膜传感器研究了合成射流频率和振幅的大参数空间，以识别产生皮肤摩擦最大变化的参数。对所选择的一组参数进行LES模拟，并提供了对边界层和合成射流之间的相互作用的更完整评估。下游五个边界层厚度，通常发现致动器之间的皮肤摩擦增加，而肌肤摩擦降低的区域持续在致动器的下游。逆转该图案以强制低频。总的来说，迫使霉菌的跨越皮肤摩擦增加，除了在高频和低振幅下迫使时，净皮肤摩擦减少持续下游。将讨论这些结果的物理解释。

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