Flow visualization of the ventilated cavities generated by a surface piercing propeller

In the present study, 3 wake parameters are semi-automatically measured in 63 composite-labeled images of a surface piercing propeller tested at yaw angles 0--30 degrees, pitch angles 0--15 degrees, propeller immersion ratios of 0.33 and 0.50 and scaled advance ratios 0.656--1.927. A fourth wake parameter is measured in four composite-labeled images of yaw angles 0--30 degrees, pitch angle 0 degrees, immersion ratios of 0.33 and 0.50 and scaled advance ratios 1.363--1.927. Measurements are plotted against propeller's angular position. Major findings include the behavior of wake parameters as the values of scaled advance ratio, yaw angle, pitch angle, and immersion ratio vary.