Control of Traveling Crossflow Vortices Using Plasma Actuators

Control of Traveling Crossflow Vortices Using Plasma Actuators
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使用等离子体致动器控制行进横流涡流

DOI:
10.1007/978-3-319-68394-2_15
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
M. J. Kloker
M. J. Kloker
中科院分区:
--
文献类型:
--
作者:
P. C. Dörr;Z. Guo;J. M. F. Peter;M. J. Kloker

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最近通过直接数值模拟表明,等离子体致动器可用于延迟由扫掠空气动力表面的三维边界层中的稳定横流涡流(CFV)引起的层流-湍流转变。在当前的工作中,通过两种技术探索了此类执行器控制由行驶 CFV 引起的转换的适用性。在第一种技术中,称为上游流动变形,执行器用于激发稳定的 CFV 控制模式。由此产生的窄间距控制 CFV 会产生有益的平均流量畸变,并削弱主要横流不稳定性,从而产生延迟过渡。在第二种技术中,非线性行进 CFV 的直接衰减,执行器位于更下游,行进 CFV 已经在那里建立。然后,针对横流方向的局部非定常力旨在通过直接处理三维非线性扰动状态来衰减移动 CFV 的振幅。这两种技术的转换都可以被延迟,但是上游流动变形方法的效率明显更高。
It has been shown recently by direct numerical simulations that plasma actuators can be used to delay laminar-turbulent transition caused by steady crossflow vortices (CFVs) in three-dimensional boundary layers on swept aerodynamic surfaces. In the current work the applicability of such actuators to control transition caused by traveling CFVs is explored by two techniques. In the first technique, named upstream flow deformation, the actuators are used to excite steady CFV control modes. The resulting narrow spaced control CFVs induce a beneficial mean-flow distortion and weaken the primary crossflow instability, yielding delayed transition. In the second technique, the direct attenuation of nonlinear traveling CFVs, the actuators are positioned more downstream, where the traveling CFVs have already established. The localized unsteady forcing against the direction of the crossflow is then aimed at attenuating the amplitude of the traveling CFVs by directly tackling the three-dimensional nonlinear disturbance state. With both techniques transition can be delayed, however with a significantly higher efficiency for the method of upstream flow deformation.
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