Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
A unique micro sensor for flow-direction and velocity measurement has been developed. The sensor is composed of a hot-wire and a group of cold-wires. The normal hot-wire placed upstream is used not only to measure an instantaneous velocity magnitude but to operate as a heat source. On the other hand, the group of cold-wires placed downstream is used to detect a thermal wake formed behind the upstream hot-wire. By applying the Gaussian interpolation technique to the cold-wire outputs to find the position of a maximum temperature rise, we can also measure an instantaneous vector of fluid velocity. As reported previously, by using this sensor, fluctuating two velocity components are successfully measured in a turbulent wake flow behind a cylinder. In this study, we assess the performance of this sensor to reveal whether this technique can also be applied successfully to a turbulent boundary layer flow. It is found that if we apply the response compensation to the cold-wire outputs, the measurement result of the wall-normal velocity component is quite reasonable as well as that of streamwise velocity component.
