Active Flow Control by Micro Systems

Micro-Electro-Mechanical-Systems (MEMS) technology provides miniature sensors and actuators. These MEMS transducers enable the ability to control flows in a new domain. In this paper, flow control issues in length scales differing in over six orders of magnitude will be discussed. Within a hand-held device, we will detect biological agents through DNA/RNA identification using MEMS fabricated filters, pumps, and sensors. Methods for handling minute amount of fluid in an accurate and efficient manner are challenging problems. On the other extremity, micro-sensors and micro-actuators can be used to control macro aerodynamic devices. With the use of flexible MEMS shear stress sensors and “bubble” actuators, leading edge vortices can now be altered with near real-time response. This leads to full control of a delta wing aircraft and provides the possibility of a future agile, tailless, and stealthy aircraft.