中文摘要：

为了研究风力机翼型的噪声特性,基于翼型泛函集成理论与翼型噪声计算模型,建立了低噪声翼型优化设计数学模型,提出在设计攻角情况下升阻比与噪声比值最大为目标函数,对优化后的新翼型CQU-DTU-B18翼型与NACA-64-618翼型在相同的风洞实验及风速条件下进行了噪声对比分析。研究表明,理论噪声计算模型虽然与实验数据有一定的偏差,但是翼型的升压级随频率的变化趋势是一致的,表明了翼型噪声计算模型的准确性;相比NACA-64-618翼型,CQU-DTU-B18翼型具有更低的噪声特性,从而验证了该设计方法的可行性。对于如何设计低噪声翼型及怎样降低翼型噪声具有重要的指导作用。

英文摘要：

In order to study the noise characteristic of wind turbine airfoils,the airfoil optimal design mathematic model was built based on airfoil functional integrated theory and noise calculated model. The new optimized objective function of maximizing lift / drag to noise was developed on the design angle of attack.Then,the comparison of sound pressure level between CQU-DTU-B18 and NACA-64-618 airfoil was analyzed under the same condition of wind tunnel experiment and wind speed. It is indicated that the changed trend of the predicted noise results are in agreement with that of the tested data,though there is a certain difference between the theory results and experiment data. Compared with NACA-64-618 airfoil,the CQU-DTU-B18 airfoil exhibits lower noise,which validates the feasibility of this design method. It is a guide to design wind turbine airfoil with lower noise and to reduce airfoil noise.