Turbulent boundary layer control with spanwise DBD plasma actuators
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摘要:
文章研究展向介质阻挡放电（dielectric barrier discharge，DBD）等离子体激励控制平板湍流边界层（
Re τ=1140 ），采用热线技术测量减阻效果和边界层速度型。在相邻上电极中心的下游位置，等离子体控制使得摩阻减小，随着占空比的增加，减阻率先增加后减小，在占空比为0.5时达到最大，边界层内层区域（y + < 200）的速度减小；在上电极正下游位置，等离子体控制使得摩阻增加，减阻率随占空比的增加而几乎线性地减小，边界层内层区域（y + < 100）的速度增大；随着远离激励器，控制效果逐渐减弱，在激励器下游1.27δ 附近，控制效果基本消失。Abstract:The flat plate turbulent boundary layer control by spanwise dielectric barrier discharge (DBD) plasma at
Re τ = 1 140 was investigated, and the drag reduction and boundary layer profiles were measured using hot-wire technology. Result showed that, the skin fraction drag with plasma control decreased downstream of the center of two adjacent upper electrodes, and with the increase of duty cycle, the drag reduction increased first and then decreased, reaching a maximum as the duty cycle was 0.5. Meanwhile, the velocity in the inner region of the boundary layer (y +<200) decreased. In the downstream position of the upper electrode, the drag increased with plasma control, the drag reduction decreased almost linearly with the increase of duty cycle, and the velocity in the inner region of the boundary layer (y +<100) increased. The control effect gradually weakened as it moved away from the actuators, and the control effect basically disappeared around 1.27δ downstream of the actuators.-
Key words:
- DBD plasma /
- flat plate /
- turbulent boundary layer /
- drag reduction /
- hot wire
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图 2 部分DBD等离子体激励器示意图（单位：mm）
Figure 2. Schematic of one part of the DBD plasma actuators （unit：mm）
图 7 激励器放电产生的温升ΔT，x/δ=0.27
Figure 7. Temperature increase ΔT at x/δ=0.27 when actuators discharge
图 9 温度修正前、后的速度型（z=0 mm，x/δ=0.27）
Figure 9. Velocity profile without and with temperature correction （z=0 mm, x/δ=0.27）
图 12 按照不同尺度无量纲化的时均速度型
Figure 12. Mean velocity profiles nondimensionalized by different scales
表 1 未控制下的湍流边界层特征参数
Table 1. Characteristic parameters of the uncontrolled turbulent boundary layer
参数 数值 U∞/（m/s） 7.5 δ/mm 55 δ*/mm 8.46 θ/mm 6.15 uτ/（m/s） 0.31 δν/mm 0.048 H 1.37 Reτ 1140 Reδ* 4262 
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