低ソリディティ垂直軸風車の速度分布特性

抄録

It is known that small lift-type vertical axis wind turbines have high solidity and their output characteristics are different from those of large wind turbines, BEM model, and double multiple streamtube model. The interference of the blade wake is assumed to be the cause of these difference. Previous studies have investigated the effect of number of blades and turbine diameter. The results obtained showed that the increase in solitude causes blade-wake interference at lower TSR and it impedes an operation at high TSR, which is an advantage of the lift type turbine. However, it has not been clarified that this blade-wake interference does not occur in low-solidity turbine. The purpose of this study is to investigate the effect of the cord length of the blade on the wake of the low-solidity wind turbine and to clarify the characteristics of the wake flow. It was found that the mean velocity profile in the wake of turbine using short chord blade is differ from that of the high-solidity wind turbines, and there is no interference of the blade wake. This feature depends on the solidity and interference of the blade wake occurs at σ>0.1.