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Turbulent Boundary Layer Control by Plasma Synthetic Jet Actuator aiming Engineering Application

面向工程应用的等离子体合成射流驱动器湍流边界层控制

基本信息

批准号：
17360107
负责人：
OGAWARA Kakuji
金额：
$ 9.86万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360107/
关键词：
Fluid Dynamics Aero Space Engineering Control Theory Instrumentation Micro Machine

项目摘要

Several Plasma Synthetic Jet Actuators (PSJA) were made and tested to examine flow induction characteristics affected by their geometry. We found that optimal width ratio of Anode and Cathode exists in order to maximize the flow velocity induced by the actuator. Effects of PSJA on plane turbulent boundary layer were measured by Direct Shear Stress Sensor and Hot-wire Anemonetry in low speed and low turburence wind tunnel. As results, we proved that PSJA reduces shear stress at the downstream of the actuator. This shear stress reduction phenomenon is measured directly at the first time in this study, and is significant for engineering applications. However, the shear stress reduction effects observed only in the vicinity of the actuator. Shear stress was increased as goes downstream from the actuator.Computational Fluid Dynamics (CFD) studies conducted to investigate the flow fields induced by the PSJA. Compressible flow analysis considering dielectric body force clearly showed how PSJA … More induces jet flow. And we also found that vacuum dielectric coefficient can be used to simulate induced flow in sufficient quantitative accuracy.Closed loop feedback control was tested in order to improve the effectivity of the flow separation control on NACA012 airfoil. Delayed feedback control (DFC) method, using hotwire as a downstream sensor, was chosen because of its robustness to the control parameters. We found that DFC can reduce the power consumption needed to activate PSJA in half as compared to open loop control.Image Thermograph measurements were conducted to know how PSJA induces heat along with flow. In this study, glow discharge was generated using high voltage transformer and audio power amplifier. Because of significant phase shift between anode voltage and current, efficiency of the PSJA was not in satisfactory condition, in the sense that small portion of supplied electrical power as transformed into fluid flow. Temperature at downstream of PSJA often raised by 30 degree Celsius.Relative humidity effects also investigated in small channel using mass flow meter. The height of the channel was set to several times higher than the PSJA height. In conclusion, mass flow induced by PSJA tends to be decreased as relative humidity increases.We are planning to develop micro pumps and swirlers using PSJA. Less

几个等离子体合成射流激励器（PSJA）的制作和测试，以检查其几何形状的影响流动诱导特性。我们发现，存在最佳的阳极和阴极的宽度比，以最大限度地提高由致动器引起的流速。在低速低湍流度风洞中，采用直接剪应力传感器和热线风速仪测量了PSJA对平面湍流边界层的影响。作为结果，我们证明了PSJA降低了致动器下游的剪切应力。该研究首次直接测量了剪切应力降低现象，具有重要的工程应用价值。然而，剪切应力的减少效果只在附近的致动器。利用计算流体动力学（CFD）研究了PSJA引起的流场。考虑电介质体力的可压缩流分析清楚地表明了PSJA ...更多信息诱导射流。为了提高NACA 012翼型分离控制的有效性，进行了闭环反馈控制实验。延迟反馈控制（DFC）方法，使用热线作为下游传感器，因为它的鲁棒性控制参数的选择。我们发现，DFC可以减少一半所需的功率消耗，以激活PSJA相比，开环control.Image Thermograph测量进行了解如何PSJA诱导热沿着流动。本研究利用高压Transformer及音频功率放大器产生辉光放电。由于阳极电压和电流之间的显著相移，PSJA的效率不处于令人满意的状态，在这个意义上，所供应的电力的一小部分被转换成流体流动。PSJA下游的温度通常会升高30摄氏度，在小通道中使用质量流量计研究了相对湿度的影响。通道的高度被设定为比PSJA高度高几倍。总的来说，PSJA所产生的质量流量会随着相对湿度的增加而减少。我们正计划开发使用PSJA的微型泵和旋流器。少