Image Measurement of Ship Wake Flow

Abstract

This paper deals with a method of PIV for the wake flow behind a ship model. In order to measure the time-averaged velocity, the statistical method is employed. It is shown that the possibility of measuring the three-dimensional velocity field by one camera and using the only one illumination sheet. In the experiment, a new tracer has been developed to use a large model, 2m long ship model in a large circulating water channel, of which the observation section has 6m long, 1.5m wide and 1.0m deep. The diameter and specific gravity of the tracer can be adjusted easily. Fairly large tracer, around 3mm diameter, is made to demonstrate its usefulness here. The measured result shows that the measurement method and the new tracer are effective for the experiments.