Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
Coriolis force, centrifugal force, pressure gradient force in flow direction, etc. act on the flow inside the radial flow impeller such as a turbomachine. These forces also influence the boundary layer developed on the impeller wall surface, forming a very complicated internal flow. In order to improve the performance of fluid machinery and the theoretical design of impeller shape, it is indispensable to elucidate the flow phenomena inside the impeller. In this study, the final goal is to clarify the flow phenomena in the impeller by using a rectangular straight channel with low aspect ratio (1:7) modeling the impeller of actual machine. Therefore, the time mean and fluctuating velocities and the Reynolds stresses are measured by using a hot-wire anemometer with various type slanted hot-wire probes. As the result, the uniformity of the relative velocity vector to the direction of the rotation axis, known as Taylor-Proudman theorem, was observed, and the structural change in the turbulent boundary layer was clarified.
