Measurement of Three Dimensional Flow Field behind on Impeller by Means of Periodic Multi-sampling with a Slanted Hot Wire

In order to measure a three dimensional flow field and turbulent characteristics behind an impeller, a periodic multi-sampling measuring system has been developed which consists of a slanted single hot wire probe connected to a pulse motor, a scanning pulse generator, an analogdigital converter and a micro computer. With this system, three components of the mean velocity and the six Reynolds stresses in a complicated turbulent flow can be determined more accurately than with the conventional methods. Typical experimental results are presented for a measurement of a flow field immediately behind an axial flow impeller to show the availability of this measuring system.