Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2019 - September 11, 2019
A unique micro sensor for simultaneous measurement of velocity and flow-direction has been developed. The sensor is composed of a hot-wire and a group of cold-wires. The normal hot-wire placed upstream of the cold wires is used not only to measure an instantaneous velocity magnitude but as a heat source. On the other hand, the group of cold-wires placed downstream of the hot-wire is used to detect fluid-dynamical behavior of a thermal wake formed behind the hot-wire. In this study, we propose to use the temperature difference between two cold-wire outputs to estimate the flow angle. We assess the performance of the present data processing to reveal whether this technique can be applied successfully to the turbulence measurement of a flat-plate boundary layer flow. As a result, compared with the previous Gaussian interpolation technique using multipoint cold-wire outputs, the measurement result of the wall-normal velocity component has been improved, and this seems to demonstrate that the use of only two cold-wires is enough to detect the flow angle.
