Experimental measurements of propulsive factors in following and head waves

The results from resistance measurements in calm water and load-varying self-propulsion tests regular head following waves are presented. experimental campaign is conducted the large towing tank at SINTEF Ocean (formerly MARINTEK). openly accessible hull of single screw Duisburg Test Case selected as test case. wave added resistance, ship motions RAOs, axial wake fraction, thrust deduction relative rotative efficiency, propeller open-water efficiency behind ship, propulsive determined. Regarding calculation experiments show effect utilizing bare instead linearly extrapolated zero thrust. If former applied, fraction will be dependent on load propeller. latter utilized, independent loading. As expected, lower than waves. heave pitch larger waves, whereas surge motion higher effective affected by both loading motions. In case former, loading, fraction. For latter, a general decrease noticed compared to water. On contrary, comparison computed with appears slightly However, final conclusion was not drawn because uncertainties this coefficient. variation mainly related change barely ship. Except very amplitudes, hardly influenced primarily efficiency. Based campaign, overload provide good estimation propulsion for vessel.