振荡水柱波浪发电空气透平工作特性数值模拟

为更深入地探讨振荡水柱式波能发电装置的原理,对用于波力发电装置二次能量转换的威尔斯式透平进行了三维全流道模拟计算。针对对称翼型叶片和非对称翼型叶片的威尔斯式透平,分别考察了其在不同叶片安装角下的效率和出力随流量系数的变化趋势,得出了不同叶片安装角时威尔斯式透平运行的最佳参数。在相同工况下,对比分析了不同翼型叶片威尔斯式透平的效率、出力、输入系数及扭矩系数随流量系数的变化,并比较了叶片表面的压力分布情况。结果表明,随着叶片安装角增大,装置最高效率值增大,且在安装角大于9°后变化缓慢,而装置最大出力却随着安装角的增大而减小;采用非对称翼型叶片时,装置的出力、输入系数、扭矩系数均大于相同工况下对称翼型叶片装置。

Numerical Simulation of Working Performance on Air Turbine for Wave Energy Conversion Device

In order to further discuss the principle of the oscillating water column (OWC) wave energy generating set, Wells turbine used for the secondary energy conversion of the wave energy generating unit was investigated through three-dimensional full flow channel numerical calculation. Under the circumstance of different stagger angles of Wells turbine with symmetric or asymmetric airfoil blades, the variation trends of efficiency and output were surveyed along with the changing figures of the flow coefficient. The optimal parameters of Wells turbine under different setting angles were obtained. Comparisons among different aerofoil blade Wells turbines were conducted in order to analyze the fluctuation of efficiency in the same working conditions, as well as the changes of output power, input coefficient and torque coefficient along with the flow coefficient. Moreover, pressure distributions on blade surfaces were compared. The results show that the highest efficiency grows along with the increase of stagger angle while the trend is not obvious when the stagger angle exceeds 9 degrees; meanwhile, the peak efficiency value reduces during the same period. The output power, input coefficient and torque coefficient of turbine with asymmetric profile blade are larger than those of turbine with symmetric one under the same circumstance.