Active Noise Control of Bluff-Body Flows Using Dielectric Barrier Discharge Plasma Actuators
Active Noise Control of Bluff-Body Flows Using Dielectric Barrier Discharge Plasma Actuators
复制标题
使用介质阻挡放电等离子体致动器对钝体流进行主动噪声控制
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
F. Thomas
中科院分区：
文献类型：
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作者：
A. Kozlov;F. Thomas
在本实验研究中，采用DBD等离子体作动器控制雷诺数为ReD = 85,000的均匀横流条件下圆柱模型的声辐射。选择横流中的圆柱体进行研究，是因为它们代表了一种通用的流动几何形状，在所有基本方面与起落架油架或支柱相似。采用致动器使模型中的非定常流分离和相关的大尺度尾迹涡量最小化，从而降低了辐射气动噪声。采用了两种执行策略：展向和流向导向执行器。本文介绍了近场传声器的测量和用LDA对近尾迹的详细研究。展向和流向执行器的降噪水平几乎相同，分别为12.6和14dB，尾迹速度曲线的变化也相似。与自然脱落噪声相比，致动器诱导噪声的贡献很小。命名法D =柱体直径D =柱体壁厚D Re =基于柱体直径的雷诺数D St =基于柱体直径的斯特罗哈尔数x =沿流空间坐标，从柱体轴线测量y =沿流空间坐标，从柱体轴线测量
In this experimental study DBD plasma actuators are used to control acoustic radiation from circular cylinder models in uniform cross-flow at Reynolds number of ReD = 85,000. Circular cylinders in cross-flow are chosen for study since they represent a generic flow geometry that is similar in all essential aspects to a landing gear oleo or strut. The minimization of the unsteady flow separation from the models and associated large-scale wake vorticity by using actuators reduces the radiated aerodynamic noise. Two actuation strategies are used: spanwise and streamwise oriented actuators. Near field microphone measurements and detailed study of the near wake using LDA are presented in the paper. Both spanwise and streamwise actuators give nearly the same noise reduction level of 12.6 and 14dB, respectively, and similar changes in the wake velocity profiles. The contribution of the actuator induced noise is found to be small compared to the natural shedding noise. Nomenclature D = cylinder diameter d = cylinder wall thickness D Re = Reynolds number based on cylinder diameter D St = Strouhal number based on cylinder diameter x = streamwise spatial coordinate, measured from the cylinder axis y = cross-stream spatial coordinate, measured from the cylinder axis