Study Of Thermal Shear Stress Sensor

With the rapid development of the scientific and technological, the effectivemeasurement and control of fluid has become a hot topic of scientific community. Thewall shear stress is an important parameter of near-wall boundary layer to respond tothe fluid considered is in motion. If it can be measured accurately, the fluid ofnear-wall boundary layer may be controlled by an active or passive means. Andthe resistance during operation of aircraft can be outstandingly reduced, in order tosuit the purpose of improving dynamic characteristics and saving on fuel.In recent years, The sensors of wall shear stress are studied at home and abroad.There are two types of sensors according to the measure principle, direct and indirectmethods. The method of heat film is one of indirect methods and becoming hot point.But the research is still in the initial stage in China, it is far from the actual appliedrequest. The important bottleneck that restricts its development including small size,high precision, complex processing and so on. For solving the above problems,The design and implementation of a thermal shear stress in thesis based on the stud ofthese sensors. The main contents are listed as follows:First, the mathematical models of prototype using the software of FLUENT，theconstruction and size of sensors will be analyzed after this model has been validated,especially to the heat transfer rate of sensors when the thickness of basis and the ratioof length to width are changing. These results of simulation will be applied for designand production.Then, The sensors will be designed according to the results, during this time,materials of basis and heat film will considered, the structure of sensors is the focus ofdesign. In addition, the interval and wire between sensors will also be designed, thepurpose is to reduce the interference among sensors.Next, the newly designed sensors will be made, and the advantage anddisadvantage of previous sensors, a new manufacturing processes will be providedaimed at these disadvantages, strive to streamline manufacturing and improvesensitivity. Finally, the sensor will be tested in order to prove performance.