ABSTRACT

The autorotation and energy harvesting potential of bladeless turbine models are tested in a confined water stream with Reynolds numbers from 20 K to 40 K. Mini bladeless turbine models of various geometrical shapes are 3D-printed using plastic material with low printing density. Experiments were performed using a commercial closed-loop water tank capable of delivering fine incremental speed up to a maximum of 60 cm/s. The cross-cylinder models with low density appear to demonstrate autorotation at high Reynolds numbers. Other turbine models demonstrate either stagnation or oscillation for a wide range of Reynolds numbers. For the cross-cylinder models, the autorotation phenomenon appears to be promoted at lower average flow speed when an upstream asymmetrical obstacle is introduced in the stream. The rotation per minute and energy potential (voltage and current) of the autorotating model are increased with the Reynolds number.

摘要

在雷诺数为 20 K 至 40 K 的密闭水流中测试无叶片涡轮模型的自转和能量收集潜力。各种几何形状的微型无叶片涡轮模型使用低打印密度的塑料材料进行 3D 打印。使用能够提供高达 60 cm/s 的精细增量速度的商业闭环水箱进行实验。低密度的交叉圆柱模型似乎在高雷诺数下表现出自转。其他涡轮机模型展示了大范围雷诺数的停滞或振荡。对于交叉圆柱模型，当在流中引入上游不对称障碍物时，自转现象似乎在较低的平均流速下得到促进。