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首页> 外文期刊>Journal of Fluid Science and Technology >Suppression of vortex shedding from a pantograph head using vortex generator-type plasma actuators
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Suppression of vortex shedding from a pantograph head using vortex generator-type plasma actuators

机译：使用涡旋发生器型等离子致动器抑制受电弓头的涡旋脱落

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A vortex generator (VG) is one of the most successful devices used for suppression of flow separation. A conventional VG is a passive control device, so that it may suffer from an inherent drag penalty. As an alternative, we use a dielectric-barrier-discharge plasma actuator (PA) as a VG. Since few studies have been made on such a vortex generator-type plasma actuator (VG-PA), many questions still remain open, e.g., the effectiveness and the performance of the VG-PA for suppression of vortex shedding from a bluff body. In the present study, we experimentally evaluate the performance of the VG-PA by applying it to a pantograph head model of high-speed trains. The Reynolds number based on the freestream velocity and the width of the pantograph head model is 7200. The spanwise velocity induced by the VG-PA is about 33% of the freestream velocity. The flow field is measured by using particle image velocimetry. The present results show that the vortex shedding from a pantograph head model can significantly be suppressed by the VG-PA, which amounts to about 60% reduction in the transverse velocity fluctuations. It is also shown that a burst discharge control significantly improves the control effect in the single-side configuration, in which the vortex shedding is not much suppressed in the continuous mode.
机译：涡流发生器（VG）是用于抑制流分离的最成功的设备之一。常规的VG是一种被动控制设备，因此可能会遭受固有的阻力损失。作为替代方案，我们使用介质阻挡放电等离子体致动器（PA）作为VG。由于对这种涡流发生器型等离子体致动器（VG-PA）的研究很少，因此许多问题仍然悬而未决，例如VG-PA抑制涡流从钝体上脱落的有效性和性能。在本研究中，我们通过将VG-PA应用于高速列车的受电弓头部模型，通过实验评估了VG-PA的性能。基于自由流速度和受电弓头部模型的宽度的雷诺数为7200。VG-PA引起的翼展速度约为自由流速度的33％。通过使用粒子图像测速仪测量流场。目前的结果表明，受电弓头部模型产生的涡流可以被VG-PA显着抑制，这相当于横向速度波动减少了约60％。还表明，爆破放电控制在单侧构造中显着改善了控制效果，在单侧构造中，在连续模式下旋涡脱落没有得到太多抑制。

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