为精确控制潮流能水轮机的输出功率与载荷,得到叶片安装角控制规律,基于动量叶素理论、粘性CFD数值模拟以及模型试验的方法,对1 k W水轮机模型在不同安装角度下的水动力性能进行研究,计算水平轴潮流能水轮机叶片在不同安装角下的水动力...为精确控制潮流能水轮机的输出功率与载荷,得到叶片安装角控制规律,基于动量叶素理论、粘性CFD数值模拟以及模型试验的方法,对1 k W水轮机模型在不同安装角度下的水动力性能进行研究,计算水平轴潮流能水轮机叶片在不同安装角下的水动力性能与载荷。数值模拟与理论计算的结果表明:叶片安装角度的改变对水轮机的输出功率与载荷均有较明显影响,并呈现一定规律;通过模型实验验证了数值模拟方法的可靠性。展开更多
The instantaneous angle of attack on the blade has a significant effect on the hydrodynamic performance of a vertical-axis tidal-current turbine with straight blades. This paper investigates the influence of different...The instantaneous angle of attack on the blade has a significant effect on the hydrodynamic performance of a vertical-axis tidal-current turbine with straight blades. This paper investigates the influence of different preset angles of attack on the hydrodynamic performance of a three-bladed, vertical-axis, tidal-current turbine both experimentally and numerically. Experiments are carried out in a towing tank. This tested turbine＇s solidity is 0.1146. The preset angles of attack on the blade are -3°, 0°, 3°, and 5°, in the experiments. Experimental results show that with the increase of the preset angle of attack from -3°, to 5°, the hydrodynamic performance of the turbine is improved significantly with the power coefficients being increased from 15.3% to 34.8%, respectively. Compared to the result of a 0° preset angle of attack, the performance of the turbine with positive preset angles of attack is experimentally demonstrated to be beneficial. This performance improvement is also shown by numerical simulations based on the Unsteady Reynolds Averaged Navier-Stokes （URANS） equations. In addition, the numerical results show that the optimal positive preset angle of attack is 7° for the turbine studied. The corresponding power coefficient is 38%. Beyond this optimal preset angle of attack, the hydrodynamic performance of the turbine decreases. Therefore, due to the dynamic stall phenomenon, an optimal preset angle of attack exists for any vertical-axis turbine. This value should be considered in the design of a vertical-axis tidal-current turbine. words：展开更多
文摘为精确控制潮流能水轮机的输出功率与载荷,得到叶片安装角控制规律,基于动量叶素理论、粘性CFD数值模拟以及模型试验的方法,对1 k W水轮机模型在不同安装角度下的水动力性能进行研究,计算水平轴潮流能水轮机叶片在不同安装角下的水动力性能与载荷。数值模拟与理论计算的结果表明:叶片安装角度的改变对水轮机的输出功率与载荷均有较明显影响,并呈现一定规律;通过模型实验验证了数值模拟方法的可靠性。
基金supported by the Fundamental Research Funds for the Central Universities(Grant No.DUT13JN10)the Doctoral Starting Up Funds of Liaoning Province(Grant No.20111029)
文摘The instantaneous angle of attack on the blade has a significant effect on the hydrodynamic performance of a vertical-axis tidal-current turbine with straight blades. This paper investigates the influence of different preset angles of attack on the hydrodynamic performance of a three-bladed, vertical-axis, tidal-current turbine both experimentally and numerically. Experiments are carried out in a towing tank. This tested turbine＇s solidity is 0.1146. The preset angles of attack on the blade are -3°, 0°, 3°, and 5°, in the experiments. Experimental results show that with the increase of the preset angle of attack from -3°, to 5°, the hydrodynamic performance of the turbine is improved significantly with the power coefficients being increased from 15.3% to 34.8%, respectively. Compared to the result of a 0° preset angle of attack, the performance of the turbine with positive preset angles of attack is experimentally demonstrated to be beneficial. This performance improvement is also shown by numerical simulations based on the Unsteady Reynolds Averaged Navier-Stokes （URANS） equations. In addition, the numerical results show that the optimal positive preset angle of attack is 7° for the turbine studied. The corresponding power coefficient is 38%. Beyond this optimal preset angle of attack, the hydrodynamic performance of the turbine decreases. Therefore, due to the dynamic stall phenomenon, an optimal preset angle of attack exists for any vertical-axis turbine. This value should be considered in the design of a vertical-axis tidal-current turbine. words：
