RANSによるクロスフロー風車周りの流れの再現

抄録

Previous studies have shown that installation of a symmetrical casing that is adapted to the prevailing wind with two wind directions for a crossflow wind turbine improves performance. The symmetric casing utilizes the depressurization effect of the separating vortex to increase the flow rate into the impeller, and the flow field is extremely complex, so capturing the flow in a numerical analysis is necessary to improve performance and clarify mechanisms such as loss generation. However, quantitative evaluation of performance characteristics using RANS has not been possible at present. In this study, the numerical conditions were investigated to reproduce the flow around the wind turbine accurately by making the best use of the experimental results, because the improvement of the accuracy of numerical analysis is considered to be the key to reproduce the complicated flow. As a result, it was found that the velocity difference at the inlet of the impeller was expressed as the power difference of the cross-flow wind turbine, and the performance did not match between the experiment and the analysis. It is considered that the strong shear between the main flow from the wind tunnel outlet and the surrounding fluid has a significant effect on the flow field from the wind tunnel outlet to the impeller.