螺旋桨射流对抛石基床冲刷的数值计算

Numerical simulation of flushing action on rubble bed under scouring effect of ship stern flow

抛石基床遭螺旋桨射流冲刷破坏而危及码头使用安全,是近几年码头检测评估工作中的新问题,国内海港工程设计规范中未考虑船舶尾流作用对抛石基床的冲刷影响。采用计算流体力学软件Fluent建立螺旋桨射流流场三维数值模型,并利用螺旋桨射流流速的理论研究成果对数值模型进行验证。通过数值模拟,研究螺旋桨射流在码头岸壁和基床底面影响下的变化规律,建立了船舶尾流在重力式码头前沿的最大冲刷流速及其位置的经验公式。

Ship stern flow leads to the destruction of gravity wharf＇s rubble bed, which is gradually becoming a new problem in terminal testing evaluation. The effect of ship stern flow on rubble bed stability is not estimated in the code of harbor and coastal engineering design in China. Using computational fluid dynamics software Fluent, a three dimensional numerical model of propeller jet flow field was established, and the propeller jet velocity distribution results were validated by the study of the marine propeller jet velocity theory at home and abroad. With the results of numerical simulation, the variation laws of the propeller jet under the influence of wharf shore wall were obtained, and the empirical formula of the maximum scour flow velocity and its location were proposed.