Application of Quasi-Continuous Method to Open-Water Characteristics Predictions of Propellers with Energy Saving Ducts

摘要

QCM has been applied to open-water thrust and torque predictions ofthe ducted propellers with different positions of the propeller and duct.The QCM results are in good agreement with the experimental data ofthe propellers positioned inside a duct. The results of propellers in thedownstream of the duct show no significant dependence on the lengthof the straight trailing vortex of the duct. Comparison with the resultscalculated without any duct has indicated no improvement of thecalculated open-water characteristics by positioning the present duct infront of the present propeller.