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首页> 外文会议>Smart Structures and Integrated Systems Mar 3-6, 2003 San Diego, California, USA >MEMS based Active Skin for Turbulent Drag Reduction
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MEMS based Active Skin for Turbulent Drag Reduction

机译：基于MEMS的主动蒙皮，可减少湍流

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摘要

Drag reduction for aerial and underwater vehicles has a range of positive ramifications: reduced fuel consumption, larger operational range, greater endurance and higher achievable speeds. Recent Direct Numerical Simulation (DNS) studies have shown that the application of a transversely acting, traveling waveform like force, that is confined to the viscous sublayer of the flow, can result in significant reduction in turbulent drag. Since the action of this force wave is confined to a very small region of fluid right next to the surface, it is postulated that the application of a traveling surface wave, which is also confined to these dimensions, would in effect result in the necessary traveling force wave. In this work, a generalized actuation principle for generating a traveling wave on the surface of a skin is proposed and analyzed. The flow control technique pursued is "micro" in the sense that only micro-scale wave amplitudes (order of 30 μm) and energy inputs are expected to produce significant benefits. Hence, a MEMS based approach to the design of the active skin is considered, that utilizes actuation by active materials such as Shape Memory Alloys (SMA)s and piezoelectric actuators. Specifically, a MEMS based design that incorporates thin film SMA actuators is developed and the process flow methodology required for its microfabrication is discussed. For preliminary testing and validation of the DNS results, a mechanically actuated prototype skin, the operation of which has been refined through several iterations, has been manufactured using a rapid prototyping machine.
机译：航空和水下车辆的减阻具有一系列积极的影响：减少了燃油消耗，更大的工作范围，更大的耐用性和更高的可达到的速度。最近的直接数值模拟（DNS）研究表明，仅限于流的粘性子层的横向作用的行进波形（如力）的施加可显着减少湍流阻力。由于该力波的作用被限制在紧挨着表面的很小区域的流体中，因此，假定还限制在这些尺寸的行进面波的施加实际上会导致必要的行进。力波。在这项工作中，提出并分析了在皮肤表面产生行波的通用驱动原理。所追求的流量控制技术是“微”的，因为只有微尺度的波幅（30μm的量级）和能量输入才有望产生显着的收益。因此，考虑了一种基于MEMS的主动皮肤设计方法，该方法利用了诸如形状记忆合金（SMA）和压电致动器等活性材料的致动。具体而言，开发了一种基于MEMS的设计，该设计结合了薄膜SMA致动器，并讨论了其微细加工所需的工艺流程方法。为了对DNS结果进行初步测试和验证，已使用快速成型机制造了机械致动的原型蒙皮，该蒙皮的操作已通过多次迭代进行了完善。

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