Full Scale Investigations on Pre-Swill Stators by RANS Method
Dr.-Ing. Yan Xing-Kaeding, Hamburg Ship Model Basin, HSVA, Hamburg, Germany
Within the EU FP7 project GRIP (Green Retrofitting through Improved Propulsion), HSVA has performed the hydrodynamic design of a Pre-Swirl Stators (PPS) for a bulk carrier. The complete design, optimisation and evaluation procedure has been conducted in full scale to avoid scale effects. The in-house RANS code FreSCo+ was coupled with the in-house propeller code QCM (Quasi-Continuous Method) to investigate the complex interaction of hull-ESD-propeller. The resulting PSS design has been constructed and installed on the actual built bulk carrier by project partner ULJ. Extensive sea trials of this ship without and with PSS have been performed in short sequence and both in good weather conditions. The trial results of a reduction of more than 6% on power at equal speed (16kn) or an increase of 0.3 Knots on speed at equal propulsion power confirmed the effectiveness of the PSS.