Experimental Investigation of the Two-Dimensional Hydrodynamic Characteristics of Bluff Symmetrical Fairing Sections

摘要

An experimental wind tunnel investigation has been conducted to determine the hydrodynamic characteristics of bluff symmetrical sections with high thickness/chord ratios. The sections are used as fairings for circular cylindrical members, such as towing cables and offshore drilling rig riser pipes, which are deeply immersed in the ocean environment so that they are cavitation free. The fai rings serve to reduce drag and lateral vibrations due to vortex shedding. The section tested had a 40 percent thickness/chord ratios. Measurements included the two dimensional minimum drag coefficient, chordwise neutral stability point, yaw torque about the pivot center, and boundary layer transition and separation.