PIV Measurement of the Flow around a Stirring Object Revolving inside a Circular Casing

Abstract

In this paper, we measure the flow around a stirring object revolving inside a circular casing by using a derotator and the Rotational-Invariant-PTV. We experimentally evaluate the performance of the Rotational-Invariant-PTV with a derotator in three different states of the rotational flow in a circular casing, which are rigidly rotating flow, unsteady flow and stationary flow. As a result, it is confirmed that we can stably observe the rotating flow as a stationary state through a derotator, and easily measure the unsteady velocity field around a stirring object. In addition, we show the robustness of the Rotational-Invariant-PTV against strong rotation by comparing the particle tracking results of the Rotational-Invariant-PTV with those of the Cross-Correlation-PTV.