Wu Tiecheng

The experimental investigation of nominal wake of ice-going ship attached with ice based on SPIV technology

This paper is based on 76000DWT Panmax Bulker with Ice Class 1B, nBy using PIV measuring technology and towing DANTEC PIV system, the nnominal wake field in open water is measured. Bilge vortex, propeller ncap vortex and hook-shaped velocity contour are all observed precisely. nThe results show that the flow field characteristics are in accordance nwith stern flow field of U-huge ship, such as KVLCC and JBC. Then nthe stern nominal flow field is measured as the ship is attached to nice. Axial velocity distribution, velocity vector distribution and nstreamline are also analyzed. The results indicate that attachment nof ice load makes the stern region produce dummy thickness which is nequal to the thickness of ice. The dummy thickness destroys the fine nlinetype design and makes the stern become V-type which is not the nbest stern type. The attachment of ice in the bottom and side shell nlead to the disturbtion stern nominal flow field has to bear when nnaked hull is sailing. Turbulent boundary layer around the shell is ndestroyed. Non-streamlined shape of ice produces complex vortex, and nthe disturbtion among vortexes results in the appearance of disordered nvortex structure.