Robust, High Sensitivity, Dynamic Wall Shear Sensors for Flow Diagnostics

用于流量诊断的坚固、高灵敏度、动态壁剪切传感器

• 批准号: 0510238
• 负责人: Pavlos Vlachos
• 金额: --
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-15 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0510238&HistoricalAwards=false
• 关键词: Robust; Sensitivity; Dynamic; Wall; Shear

Abstract0510238PI: Pavlos Vlachos, Virginia TechWall shear stress measurements and the contribution of shear stresses to the viscous drag of air and water vehicles are critically important for numerous applications. The sensitivity and accuracy needed to quantify the wall shear stresses in complex unsteady flows is not attainable with the existing state-of-the-art measurement technologies. This research effort provides a paradigm shift in direct sensing of wall shear stresses by employing ionomeric electroactive polymer transducers. Preliminary results demonstrate that this active material exhibits exceptional sensitivity to flow-induced shear stress with high accuracy and high frequency response. In addition, it allows fabrication of miniature flush mountable sensors that eliminate moving parts increasing robustness, ease of implementation and reducing cost. Ionic polymer transducers have never been used for wall shear sensing thus the electromechanical coupling mechanism that provides shear transduction is not understood. This program will determine the fundamental sensing properties of ionic polymer transducers under wall shear will improve sensor fabrication and packaging and will develop a methodology for high frequency dynamic calibration. A variety of possible applications ranging from biofluids to classical aerodynamics will be explored. This is a project supported under the Sensor Initiative NSF 05-526.

摘要 0510238PI：Pavlos Vlachos，Virginia TechWall 剪切应力测量以及剪切应力对空气和水上交通工具粘性阻力的贡献对于许多应用至关重要。 现有最先进的测量技术无法达到量化复杂非定常流中壁面剪应力所需的灵敏度和精度。这项研究工作通过采用离聚物电活性聚合物传感器，为直接传感壁剪切应力提供了范式转变。初步结果表明，这种活性材料对流动引起的剪切应力表现出卓越的敏感性，具有高精度和高频响应。此外，它还允许制造微型齐平安装传感器，消除移动部件，从而提高稳健性、易于实施并降低成本。离子聚合物传感器从未用于壁剪切传感，因此提供剪切传导的机电耦合机制尚不清楚。 该计划将确定离子聚合物传感器在壁剪切作用下的基本传感特性，将改进传感器的制造和封装，并将开发一种高频动态校准方法。将探索从生物流体到经典空气动力学的各种可能的应用。这是传感器倡议 NSF 05-526 支持的项目。