Experiment investigation about drag reduction of riblet structure on large-scale cylinder

Experiments of large-scale cylinder model with smooth and riblet surfaces were carried out under different speeds and attack angles in wind tunnel, providing a reference for engineering application of drag reduction technique about riblet surface. Results from comparison and analysis are as follows: wind speed has a great influence on drag reduction effect of riblet surface. Drag reduction effect increases first, then decreases with increasing wind speed, and reaches to peak at certain speed. The drag reduction effect could exceed 20 percents. Attack angle has limited influences on drag reduction effect of riblet surface. The riblet structure has almost no influence on the lift coefficient and pitching coefficient of model.