ABSTRACT

Two computational fluid dynamics models were developed to analyse the internal fluid mechanics of an Archimedes screw’s buckets. The models were evaluated against laboratory-scale experimental data, which suggested that they were acceptably accurate. Results of power-generating torque, internal fluid velocities, wall shear stress, and leakage flow rates were all explored with respect to changing rotational speeds. It was found that increasing rotational speed while maintaining “full” screw buckets would produce: similar torque values (by extension: power increased), higher velocity magnitudes of fluid parcels in a bucket, less gap leakage flow rate, and higher wall shear stress rates (by extension: more frictional losses).

摘要

开发了两个计算流体动力学模型来分析阿基米德螺旋桨桶的内部流体力学。这些模型是根据实验室规模的实验数据进行评估的，这表明它们是可以接受的准确度。发电扭矩、内部流体速度、壁面剪切应力和泄漏流量的结果都与变化的转速有关。发现在保持“满”螺旋桶的同时增加转速会产生：类似的扭矩值（推而广之：功率增加）、桶中流体包裹的更高速度幅度、更少的间隙泄漏流量和更高的壁剪切应力率（延伸：更多的摩擦损失）。