ABSTRACT

Many efforts have been made to enhance the hydrokinetic turbines’ energy efficiency, extracting the energy from the flowing water in the canal and river. Savonius hydrokinetic turbine is one of the turbines producing mechanical power output using renewable energy sources of flowing water. It has good starting characteristics but has low energy efficiency. In the present investigation, an attempt is made toward the enhancement of the energy efficiency and load-carrying capacity of the Savonius turbine. The two dual-rotor Savonius turbine designs with deflector plates are proposed termed as Dual Rotor with Diverging Deflector Plate (DR-DDP) and Dual Rotor with Converging Deflector Plate (DR-CDP). The investigations are carried out with numerical simulations. The experiments are also performed for the validation of the methodology adopted in the presented numerical simulations. The results indicate the improved performance of the turbine units with both deflector plate designs. The power coefficient with the Savonius turbine unit’s investigated design is enhanced from 0.135 of the conventional turbine to 0.16 with DR-DDP, and that up to 0.20 with DR-CDP.

摘要

已经做出了许多努力来提高流体动力涡轮机的能量效率，从运河和河流中的流动水中提取能量。Savonius 流体动力涡轮机是利用流动水的可再生能源产生机械动力输出的涡轮机之一。它具有良好的启动特性，但能量效率低。在目前的研究中，试图提高 Savonius 涡轮机的能效和承载能力。两种带有导流板的双转子 Savonius 涡轮机设计被称为带有发散导流板的双转子 (DR-DDP) 和带有会聚导流板的双转子 (DR-CDP)。研究是通过数值模拟进行的。还进行了实验以验证所提出的数值模拟中采用的方法。结果表明具有两种导流板设计的涡轮机组的性能得到改善。Savonius 涡轮机组研究设计的功率系数从传统涡轮机的 0.135 提高到 DR-DDP 的 0.16，而 DR-CDP 则高达 0.20。